Document aJxkM7oVbagaejkBx5QbjN32X

SECTION 1 INTRODUCTION For over half a century, Bestwall gypsum building materials have been accepted as a standard of quality everywhere. This recognition is earned through continued creative research which provides such unique advantages as glass fiber reinforced gypsum plasters. The fiberglass content of Bestwall fibered plasters is an important factor to consider in specifying lath and plaster construction. Literally miles of glass fibers (39y2 miles per bag of plaster) offer greater resilience and bonding properties that resolve many job difficulties and assure superior results. Armed with this exclusive development, the architect can select with confidence from a variety of lathing systems to meet exacting requirements. INDEX Cl ASS FIRFR RFINFORCFMFNT BESTWALL GYPSUM LATH 1 ATHINP, SYSTFMS BESTWALL GYPSUM PLASTERS MACHINE APPI ICATION 1 ATH AND PI ASTER CONSTRUCTION LATH AND PIASTER SPECIFICATIONS PROhllCT nATA COMPANY DATA Section Page 12 2 3-4 3 5-8 4 9 11 5 12 14 5 15 16 2 Years of research and field use have demonstrated that glass fibered plaster is one of the most versatile plasters ever developed. This advanced improvement in fibered plasters controls the evenness of the scratch coat to produce good bond, thus assuring speedier and easier application. Textile glass filaments of uniform strength and length are dispersed in the mix. These individual filaments weigh only 1/150 to 1/200 as much as most manila or sisal fibers, yet they are as strong as high strength steel of the same size. Speed--Glass filaments of uniform length and tremendous strength provide speedier and easier application. There is no balling up to groove the plaster and necessitate backtrack ing and smoothing. Quality Plastering--Provides better keying on metal or per forated gypsum lath. A better surface is made for reception of the finish coat. Economy--Spreads freely and provides high coverage with less droppings. With the glass fibers there is little build up of fibers and plaster on tools or mixer blades. Machine Application--Where fibered plaster is specified and machine application is used, glass fibered plaster effects greater construction economies and added design possibili ties. No clogging in the nozzle, no plugging in the hose. FIBERGLASS C'TA Content in Typical Bestwall Plasters Sq. yd- Vi" thick over Gypsum Lath NEAT (Fibered) Ton or Bag LITEMIX (Fibered) Ton or Bag 790 mi. 391/? mi. 650 mi. 26'/, mi. 3.9 mi. (based on 200 yd. coverage per ton) 4.7 mi. (based on 140 yd. coverage per ton) Quality controlled high strength uniform fibers, '/?" long, are well dispersed in the mix. Chart indicates fiberglass content measured in miles. (Figs, are approximate). Further information and free consultation may be obtained by writing directly to the Bestwall Gypsum Company. Or consult nearest district office listed on the back cover of this catalog. SGP 0003902 1 PLAIN GYPSUM LATH Description Bestwall Gypsum Lath consists of a core of gypsum rock sandwiched between two layers of special multi-layer paper cover:ng. The exposed layer is soft and water absorbent, permitting water in the plaster to penetrate the surface. As plaster sets, crystals of gypsum form on the lath paper surface and attach themselves to the main body of the plaster to form a mechanical key, thus assuring maximum bond. The lath paper has water resistant inner plies which prevent the water in the plaster from soaking through it and thus mini mizes sagging of the lath and plaster. Available with round edges. Uses The standard gypsum plaster base for nail or staple or clip application to wood or steel framing. Size 16' x 48', y," or ft" thick. (16ft' x 48" on West Coast only) 12c Bes LATH SECTION 2 BESTWALL LONG-LENGTH LATH Description Manufactured in special lengths, up to 12', with round or tongue and groove edges. Has same core and paper as Plain Gypsum Lath. Uses Designed primarily for use as a plaster base for thin (2") solid partitions provid ing fire resistive ratings up to two hours. Can also be used with furring over exterlor masonry walls as a plaster base. Size 24" x 96", l/2" thick. . > * * ,* . **# * | ^ ..................................................................................... BESTWALL PERFOLATH Description Plain lath with 3/4" diameter holes spaced 4" center to center, 48 holes per sheet. Provides a double mechanical bond that increases fire protection. (See Technical Data, p. 9). Has same core and paper as Plain Gypsum Lath. Use Bestwall Perfolath's applications are iden tical to Plain Lath. A wood stud partition faced with Perfolath and full thickness of plaster specified has a fire rating of 1 hour (15 minutes longer than Plain Lath). Size 16" x 48", %" thick. BESTWALL INSULATING LATH Description Plain Lath with aluminum foil laminated on the back. Reflects 90% of radiant heat and acts as efficient vapor barrier. Use Designed primarily for application to ex- terior walls and top floor ceilings. Must face a minimum air space of %" to develop reflective insulation value. Size 16" x 48",.%' or %" thick. BESTWALL PINHOLATH Description Plain lath with the paper surface pinhole perforated into the gypsum core. Permits rapid absorption of water from plaster. Properly applied, full basecoat may be applied ^t one time, even when using machine application. Pinholes no larger than ft," in diameter, spaced ft'on centers. Uses Specially designed for machine-applied plasters. Fast and great water absorption speeds plaster application by holding plas ter in place during rodding and darbying. Sizes 16" x 48", 16" x 96", %" thick. SGP 0003903 3 SECTION 2 LATHING SYSTEMS Bestwall Olsen Gypsum Lath Clips permit fast erection of lath over wood or steel framing. Olsen clips attach lath permanently and securely to any framing, require less nailing and no wire-tying. Their strength and flexibility allow slight movement of framing without cracking plaster, compensating for expansion and con traction stresses. Clips also provide resilience in wall, reducing sound transmission. Simplified, efficient design designates their usage in a variety of wall and ceiling assemblages. TYPICAL LATH SYSTEMS THIN SOLID PARTITION SYSTEM HIGH SOUND TRANSMISSION RESISTANCE (Bestwall Gypsum Lath Base) H Clips reinforce external corner wherever gypsum lath is not supported by studding and provide positive anchors for partition junctures. D Clips engage top edge of the long length lath at ceiling runners. G Clips stabilize temporary bracing bar that supports lath during plastering operation. lsT C & E Clips attach flush edges of adjacent lath panels. (hJlrO RESILIENT WALL CONSTRUCTION (Bestwall Gypsum Lath Base) RX Clips attach gypsum lath to wood framing by means of resilient springs in the wire clips and nailed to the framing. III C Clips (Resilient) are nailed to wood framing members. These clips float the lath free from structure to provide less sound transmission. K Clips (Resilient) are starting clips used at the base of a wall. B-l Clips secure lath edges of internal and external angles formed by walls and ceilings. Do not require nailing. SUSPENDED CEILINQ CONSTRUCTION (Bestwall Gypsum Lath Base) l Clips (Centerboard) are used in place of field clips to prevent ceiling lath from sagging. JL Steel-Tie Clips attach cross runners to main runners in suspended reiling systems. -V; f-- -f-----9" 1 i HL-F-f--9 7 ri -3 I1 1 !. 0 ^ \ T 0 f- F Clips are field clips that attach gypsum lath to hot or cold rolled channels in ceiling construction. FS Clips mechanically suspend gypsum lath from hot or cold rolled channels and are used for starting first score of lath. C Clips (Bridge) when used in suspended ceiling systems, are used as field dips. They attach straight edges of abutting gypsum lath. $ 4 SGP 0003904 &E5TWALL GYPSUM PLASTER SECTION 3 GENERAL Bestwall Gypsum Company manufactures a complete line of highly efficient gypsum basecoat and high purity finish plasters. These plasters provide a wide latitude of selection to meet all architectural requirements. Each is designed for a specific function. Finish coat plasters provide the last plaster operation before decorating. Various finishes are available, de pending on the type of texture or decorative effect desired. Basecoat plasters form that portion of the plaster con struction which is applied to masonry or lath bases and which help support and develop the properties of the finish coat. Basecoat plasters which require an aggregate are furnished with or without fibers. Bestwall basecoat plasters, both neat and mill mixed, are avail able glass fibered. DESCRIPTION The base of all gypsum plasters is gypsum in its calcined form. Gypsum can't burn and will not transfer heat sub stantially in excess of 212 F. until all its water of crystalli zation has been driven off in the form of steam. (It takes approximately an hour for 1700 heat to pass through a 1" thickness of solid gypsum). When water is added to gypsum plaster on the job, the material re-crystallizes (sets) revert ing to its original rock-like chemical form. FEATURES Fire Protection--Because of its water of crystallization, gyp sum with sand, wood fiber, vermiculite or perlite as aggre gate offers superior fire protection in hundreds of construc tions over wood or steel frame, in walls and partitions and in floor and ceiling construction and for beams and columns. (See fire ratings on p. 10). Durability--When applied in accordance with specifications, Bestwall Plasters provide uniformly strong, stable walls and ceilings, Bestwall sets evenly and uniformly to maximum hardness and strength. Under normal conditions of service, the plaster will last for the life of the building. Economy--Bestwall spreads freely, provides high coverage. The basecoat plasters bond securely to plaster bases, includ ing gypsum lath, metal lath and masonry. The finish plasters, over basecoat plasters, provide hard, dense sur faces with a minimum of working. The finish wall can be maintained easily with normal care. "Plasticized"--Bestwall basecoat plasters. Neat and LiteMix, are manufactured by a special, scientifically controlled process to maintain plasticity and easy workability. This process imparts plasticity and richness to the plaster and produces uniform high quality. Bestwall "Plasticized" Plaster makes possible fast and uniform application. Sound Insulation--Plaster adds mass to masonry units or Specially designed lathing systems, providing increased sound reduction through these assemblies. Machine Application--Bestwall glass fibered plaster is rec ommended where fibered plaster is specified and machine application is used. Special ''machine application'' formulas are available. (See p. 8 and the Plastering Specifications for details). BRAND BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL PRODUCT NEAT BASE COAT PLASTER Untibered, Fibered, and Extra Fibered LITE-MIX BASE COAT PLASTER Unlibered, Fibered (Glass Only) and Masonry Mix WOOD FIBERED PLASTER CONCRETE BOND PLASTER GAUGING PLASTER--White (Satin Spar) or Local MOL0ING PLASTER--White (Sunflower) or Local BUILDERS LIME (Autoclaved Finish Lime) SMOOTH FINISHING LIME (Normal Hydrated Finish Lime) SPEEDY MASON'S LIME (Autoclaved Mason's Lime) MASON'S LIME (Normal Hydrated Mason's Lime) KEENE'S CEMENT PREPARED SAND FLOAT FINISH PLASTER PREPARED TROWEL FINISH PLASTER LITE ACOUSTIC PLASTER--White or Ultra White ASTM STANDARDS C 28-57 C 28-57 C 28-57 C 28-57 C 28 57 C 59 50 C-206 49 C 6 49 C 207 49 S C 207 49 N C 61 50 -- -- -- FE0ERAL SPEC. SS-P 402 (N) -- SS-P-402 (W) SS-P 402 (W) SS P 402 (G) -- SS L 351 (F) SS L 351 (F) SS L 351 (M) SS L 351 (M) SS C 161 -- -- -- APPLIED UNDER ASA 42.1 ASA 42.1 ASA 42.1 ASA 42.1 ASA 42.1 -- ASA 42.1 ASA 42 1 ASA 42.1 ASA 42.1 ASA 42.1 ASA 42.1 ASA 42 1 ASA 42 1 SGP 0003905 5 SECTION 3 GYPSUM PLASTERS BESTWALL BASECOAT PLASTERS The basecoat is the most important element of a plastered wall. It not only rigidities but strengthens the lath base, helping to resist minor structural stresses; it provides the foundation for the finish coat. There are four distinct basecoat plasters, each designed for a specific function. Selection of the proper basecoat must be made with regard to the lath base to which it is applied and the desired finish coat which it must support. BESTWALL NEAT GYPSUM PLASTERS (Unfibered, Fibered and Extra-Fibered) Description; Basecoat plasters bond securely to any standard plaster base including gypsum lath, metal lath and masonry units. Requires addition of aggregate and water in field. Uses: 1. Fibered Plaster is recommended to provide greater wet adhesion and to minimize droppings with open type lath. 2. Unfibered Plaster is used for scratch coat on solid sur faces and for the brown (second) coat on any backing. Features: Durability--Applied according to specifications, Bestwalt Basecoat Plasters provide uniformly strong, stable walls and ceilings. Machine Application--Special plasters, both fibered and un fibered, are available for use in machine application. BESTWALL LITE MIX PLASTER Description: A base coat plaster that is 50% lighter than gypsum and sand plaster. Available either Fibered, Unfibered or Masonry Mix. Fibered Lite-Mix contains glass fibers to provide added strength and uniform thickness with less droppings. Requires addition of water only in field. Masonry Mix available for application on masonry bases. Uses: May be used for machine or trowel application to produce a superior basecoat. Features: Fire-Resistant--Perlite aggregate provides higher fire resist ance than sanded plasters. FINISHING PLASTERS GAUGING PLASTERS Description: Specially ground high purity gypsum finishing plasters de signed to be blended with lime putty. They provide the base for final wall or ceiling decoration. Usually applied^ over a gypsum plaster basecoat and to a thickness of to Available in "Slow Set" and "Quick Set". Features: White Coat Finish--Gauging sets to provide a hard, smooth white coat finish, over gypsum basecoat. Plasticity--Lime is used to furnish whiteness, plasticity and bulk. 1. Satin Spar Gauging Plasters are very white. 2. Bestwall Gauging Plasters made of local rock are rec ommended for use where pure white finish is not necessary. They furnish the same high quality surface as Satin Spar. MOLDING PLASTERS Description: Very white plasters made from selected gypsum rock of exceptionally high purity. Specially ground and processed to provide hard strong molds and casts. Excellent for run work and ornamental features. 1. Sunflower Molding Plasters are very white. 2. Bestwall Molding Plasters made of local rock are rec ommended for use where pure white work is not necessary. They furnish the same high quality surface as Sunflower. FINISHING LIMES Bestwall Smooth Finishing Lime (Normal Hydrated) Description: Hydrated Finishing Lime soaked to putty consistency (ap proximately 16 hours) blended in proper proportion with gypsum gauging plaster. Troweled to a smooth, hard finish over properly prepared gypsum basecoat. Must be blended with gypsum gauging plaster of proper proportion which provides initial set and strength, avoiding shrinkage cracks. Features: Whiteness. Bulk and Plasticity are provided by the lime. Fast, Easy Application with full flexibility and economy. Bestwall Builder's Lime (Autoclaved) Description: A pressure hydrated (less than 8% unhydrated oxides) spe cial finishing lime. May be mixed by adding lime to water in mechanical mixer. Features: Requires no soaking to produce smooth, uniform, white, highly plastic putty. Normal plasticity achieved immediately. MASON'S LIME Bestwall Mason's Lime (Normal Hydrated) and Bestwall Speedy Lime (Autoclaved) available. BESTWALL KEENE'S CEMENT Description: A high strength, "dead burnt" white gypsum plaster. Pro vides stronger, harder surface when substituted for gauging plaster in a lime-gauging mix. The lower the lime content, the harder the finish. Available Regular and Fast set. Features: Resistance to Abrasion--provides high resistance to abra sion making it suitable for use in bathrooms, kitchens, hospitals, etc. Low Water Absorption--because of high density, has low water absorption. Various Finishes--Keene's Cement when mixed with varying proportions of lime putty provides "standard hard" "me dium hard" and "extra hard" finishes. BESTWALL PREPARED TROWEL FINISH Description: A pre-mixed gypsum finish coat plaster requiring addition of water only. Made from high grade gypsum rock of white or local gray. Features: Strength--produces very hard surfaces, approximately twice the strength of ordinary lime-gauging finishes. Easy Decoration--can be decorated as soon as dry. # ^ 6 SGP 0003906 &F5TWALL GYPSUM PLASTERS SECTION 3 Mixes smoothly--has no tendency to block the nozzle of the plaster gun. High Insulation Value--Lite-Mix provides greater insulation than sanded gypsum plaster. Fire-Resistant--Wood Fibered Plaster provides excellent fire rating up to 50% higher than sanded plaster. BESTWALL CONCRETE BOND GYPSUM PLASTER BESTWALL WOOD FIBERED GYPSUM PLASTER Description: Non-staining shredded wood fiber additive provides good working properties when used without aggregate. Description: A basecoat plaster designed to bond permanently with monolithic concrete to preserve a hard, durable surface. Re quires addition of water only in field. Uses: Uses: Intended for use without aggregate as scratch and brown coat. May be mixed with one part of sand for scratch coat over high suction masonry. Specially formulated to compensate for 2 problems: 1. where surface is too dense for ordinary plaster to form a mechanical key, and 2. where thermal expansion of concrete is lower than that of ordinary plasters. Features: Features: Economy--Can be applied quickly and easily. Bonding Strength--Concrete Bond adheres v/ell to properly I Strength--Bestwall Wood Fibered Gypsum Plaster has ap proximately 3 times greater compressive and tensile strength than sanded plaster: up to 2% times greater resistance to prepared concrete surfaces, columns and beams and on smooth cement block walls. Low Cost--An economical basecoat plaster to provide for lateral impact and 50% greater surface hardness. application direct to concrete surfaces. BESTWALL PREPARED SAND FLOAT FINISH Description: This pre-mixed gypsum finish coat plaster has same quali ties and advantages as Prepared Trowel Finish. The only difference: this finish contains proper amount of uniformly graded white silica sand to produce hard textured surface. BESTWALL LITE ACOUSTIC PLASTER A mill-mixed product, Bestwall Lite Acoustic Plaster is a versatile, highly light reflective, acoustical finishing material designed for machine application. Made of incombustible mineral materials, it provides exceptional bond to form a porous sound-absorbing surface. May be left with natural finish or spray painted according to directions after it's thoroughly dry. Use of Lite Acoustic is not limited to new construction. Permanent bond is assured when it is properly applied to almost any surface (see Specifications). Existing ceilings can be covered effectively without removal or use of addi tional lath or backer board, providing the plaster is firm and the surface clean. Because various textures can be achieved in either White or Ultra-White, Lite Acoustic offers a wide scope of decora tive possibilities in residential, commercial or industrial con struction. May also be applied by hand trowel. (See Spe cifications for details). Features: Fire Protection--Lite Acoustic will not burn or support com bustion. Economy--Provides wide field of low cost acoustical treat ment in both new work and remodeling. Versatility--Applied over standard gypsum basecoat plaster, wall or monolothic concrete. Lite Acoustic Ultra-White can be gun applied to provide coarse, medium coarse or fine textured finishes by adjustment of machine nozzle to meet various decorative requirements. Sound Absorption Coefficients Light Reflection Coefficients Texture Finish Thickness A* 125 .25 FREQUENCIES 250 500 1000 2000 4000 .27 .52 .69 .78 .88 Noise Reduction Coefficient 55 Authority Riverbank White Ultra-White Spray 66% 70% Trowel 69% 74% | i SGP 0003907 7 SECTION 3 MACHINE APPLICATION Bestwall manufactures a full line of basecoat plasters, spe cially formulated for easy application through plastering machines. They are designed to pump at low hose pressure which insures steady and uniform flow from the nozzle without aggregate separation or plug ups and to have low water demand assuring hard, strong plastering. For scratch coat over metal lath, Bestwall Glass Fibered Plaster forms adequate keys with minimum blow through, thus assuring strong rigid plastering with minimum waste. These features provide the following advantages: Economy--Due to trouble-free application, more yards of plaster can be applied per man hour with less waste. Durability--When mixed and applied according to specifica tions. resultant plastering develops full strength and hard ness resulting in strong, durable walls and ceilings. Design Flexibility--Machine application lends itself to the flexibility of design for which gypsum plaster is noted, thus placing no limitation on use of this method of application. Machine application plasters are as follows: BESTWALL NEAT GYPSUM PLASTERS Unfibered plaster may be used for the scratch (first) coat on gypsum lath or masonry (solid surfaces) and for the brown (second) coat on any backing. Fibered plaster con tains a carefully measured amount of glass fiber to provide greater wet cohesion and minimize droppings behind open type lath. Fibered plaster is recommended for the scratch coat on perforated gypsum or metal lath and may be used for the brown coat on any backing. Extra-fibered plaster contains a greater proportion of glass fiber and is preferred in some areas for the scratch coat on metal lath. BESTWALL LITE MIX Unfibered or Fibered {Glass only) Mixes smoothly, spreads easily and has no tendency to block the nozzle of the plaster gun. Lite-Mix produces a superior basecoat. It is also available in a Masonry Mix for application on masonry bases. Water only is added on the job. BESTWALL LITE ACOUSTIC Whit* or Ultra White Can be applied over standard gypsum basecoat plaster or other clean, dry, firm bases such as concrete, metal decks, etc. Lite Acoustic (Ultra-White) can be gun applied to pro vide ceilings of acoustical value as well as textured beauty and high light reflectivity. Can also be applied by hand, if desired. 8 t SGP 0003908 BE5TWALL LATH AND PLASTER CONSTRUCTION SECTION 4 Bestwall Gypsum Plasters can be applied over gypsum or metal plaster bases on wood or steel framing. By varying the type of lath and the plaster mix and thickness, a full range of fire ratings may be obtained, from 45 minutes to four hours. TECHNICAL DATA CONSTRUCTION TYPE BASE PARTITIONS Description Thickness 2" x 4 Wood Studs 16" on Center Steel Frame 5 VI" 5>/r 5>v 5 Vi " 5V 5 V." 5V 5 Vi" S'/.- 2" 2" 2" 2" 2" uv 2 Vi" 2 vr 4 V to 5V," 4l," to 5 V%" sy." CEILINGS V Plain Gypsum Lath V," Plain Gypsum Lath V Plain Gypsum Lath V Perforated Gypsum Vt" Perforated Gypsum Metal Lath Metal Lath Metal Lath Metal Lath V," Long Length Gypsum Lath Vi" Long Length Gypsum Lath */j" Long Length Gypsum Lath `/V Long Length Gypsum Lath Metal Lath Metal Lath Metal Lath Metal Lath V Plain Gypsum Lath v, ' Perforated Gypsum Lath Metal Lath PLASTERt MIX l part of Gypsum Plaster v 100 pounds) to cu. It. aggregate THICKNESS Face of Lath to Face of Finished Surface me RATING (2 Mixes--Scratch and Brown) {1 Mix--Scratch Double-Up) Gypsum Sand 12 Gypsum Sand 1:2. 12 Gypsum Wood Fiber Gypsum-Perlite 1:2 Vet Gypsum-Sand 1.2, 1:3 Gypsum Wood Fiber Gypsum Perlite l:2V*t Gypsum-Vermiculite 1:2. 1:31 Gypsum Sand 1:1. 1:2 Gypsum Perlite l`2V?t Gypsum Perlite 1.2. 1:31 Gypsum Vermiculite 1:2, l:3f Gypsum-Sand 1:2. 1:2 Gypsum-Perlite 1:2`/z t Gypsum-Perlite 1 2. l:3f Gypsum-Vermiculite 1:2. 1.31 CvDsum-Perlite l:2l/*t Gypsum-Sand 1:2. 1:2 Gypsum-Sand 12. 1:3 w Vi" V." 1 Vz" 1 V," 1 ' l`/,~ r IV," 2 V," 2 >/, - vr l/j '* v 1 Hour 45 Minutes l Hour 1 Hour IVz Hours l Hour 2 Hours l Hour l Hour 1 Hour IV2 Hours 2 Hours 2 Hours 1 Hour 1 Hour 2 Hours 2 Hours ` 1 Hour 1 Hour 1 Hour Wood loisls and Floor Furring Channels 16" oc 16" oc 16" oc V, '' Bestwall Plain Gypsum Lath plus 1" Hex Wire Mesh V%" Perforated Gypsum Lath V' Perforated Gypsum Lath Plus Metal Lath Strip V Perforated Gypsum Lath Metal Lath Metal Lath Vs" Perforated Gypsum Lath (Clips) Va" Perforated Gypsum Lath (Clips) Vt" Perforated Gypsum Lath (Clips! Steel foists (2" Floor Slab) )6" oc 12 ` oc 16" oc , 12" oc Vi" Perforated Gypsum Lath (Clips) V,' Perforated Gypsum Lath vClips) Vs" Perforated Gypsum Lath Plus 1" Mesh V," (Clips) Plus 1" Mesh Metal Lath Metal Lath Metal Lath Steel Floors 2 to 2 Vi' Concrete Floor with Suspended Ceilings 12" oc Vi" Perforated Gypsum Lath Plus Clips and Wire Reinforcing Metal Lath Metal Lath Gypsum Sand 1:2 Gypsum-Sand 1:2 Gypsum Sand 1:2 Gypsum Perlite l:2Vzt Gypsum Sand l 2. 1:3 Gypsum-Perlite 1:2. 1:3 f Gypsum Perlite 1.2V? t Gypsum Vermiculite l:2Vjt Gypsum Perlite 1:2. l.3t Gypsum Perlite 1:2 V?) Gypsum Perlite 1:2. l;3t Gypsum-Perlite 1:2 Vat Gypsum Perlite 1:2. 1.31 Gypsum-Sand 1:2. 1 3 Gypsum Perlite 1:2. 1:31 Gypsum Vermiculite 1:2. 1:31 Gypsum Perlile l:2V:t Gypsum Perlite 12, l:3t Gypsum Wood Fiber Vz V," >/,' V vr y." v." r Vt" V r V V." v 'V on Ceilings (Vi ' on Beam) v y." 1 Hour 45 Minutes 1 Hour 1 Hour l Hour l Vs Hours l Hour 1 Hour IVz Hours _ 3 Hours 3 Hours 4 Hours 2 Hours 3 Hours 4 Hours 3 Hours 4 Hours 4 Hours COLUMNS Columns (Steel) Vi" Perforated Gypsum lath V" Perlorated Gypsum L.ith Vi Perforated Gypsum Lrth V Perforated Gypsum lath 2" Layers Vj" Plain Gypsum Lalh Metal Lath Metal Lath Gypsum-Sand l:2Vz Gypsum Sand 1:2.13 Gypsum-Perlite 1:2V* t Gypsum Perlite 1:2, 1'31 Gypsum Perlite 12. l;3f Gypsum-Sand 1.2. 1 3 Gypsum Perlite L 2. 1:31 V*" IV r IV 1 V? " y*" 1V 1 Hour 2 Hours 2 Hours 4 Hours 4 Hours WEIGHT LBS. PER SQ. FT. NRC (AVERAGE) DECIBELS 15 14.7 __......... -- 18.1 . . .i -- 16.5 -- 10.9 -- 18 1 7.4 .i i -- 16 to 21 35 to 45 35 to 45 _--_-- -- 39 ---- -- 38 ... 37 -- 38 33 -- -- 30 to 41 12 5 40 17.5 32 to 34 __ ______ -- ______ -- -- -- ______ -- -- -- ______ -- ______ ______ _____ ______ ______ --*-- ______ ______ ______ ______ --. . NOTE: This labia is a summary only, based on lesls at Underwriters l ahoiatones, National Bureau of Standards and/or Ohio State University, soonsored by the Gypsum Associa tion. Metal Lath Association, Perlite Institute. Vermiculite Institute or others The lire rating, weight and sound characteristics are based on a combination of specific details as published by the Associations and also by the National llueau of Standards in various 8MS reports, by National Board of fire Underwriters m their "List of Ratings ' and others. Moie complete listings and details are available from many sources* t Sand float or other finish except smooth trowel shall be used over perlite or yermtculite basecoat where ratio exceeds 2 cu. It. of aggregate to 100 lbs of gypsum. Smooth trowel finish shall not be used. SGP 0003909 9 SECTION 4 LATH AND PLASTER CONSTRUCTION GYPSUM LATH AND PLASTER FIREPROOFING THIN SOLID PARTITIONS A 2" Solid Partition is a non load bearing (non-supporting) unit composed of Bestwall Long-Length Gypsum lath threecoated out on both sides to a total 2" thickness. No stud ding is required. The lath is inserted into floor and ceiling runners and is temporarily braced during the plastering operation. 2" Solid Partitions make economical floor area dividers and render more usable space than hollow or tile partitions. Bestwall Olsen Gypsum Lath Clips provide easier, faster erection and eliminate wire-tying. Tested under A.S.T.M. Standards, 2' Solid Partitions of lath and sanded plaster qualify for 1-hour fire rating. For higher fire ratings, consult Technical Data--Lath and Plaster Construction on the pre vious page. m HOLLOW STEEL STUD PARTITIONS Hollow Steel Stud Partitions consist of gypsum lath and plaster over steel studding. These partitions may be load bearing or non-load bearing depending upon studding used. Studs are available in widths from 2l/2" to 6'. Bestwall Gyp sum Lath is secured to the studs by use of transverse clips or other special clips and techniques. These partitions are particularly adaptable where pipes and utilites are to be concealed. Weight of Hollow Steel Stud Partitions is determined in pounds per square foot and will range from 10 lbs. to 15 lbs. depending upon aggregate used and thickness. A 1-hour fire rating is obtained when Bestwall Perfolath and a >/2" plaster is used. Mix is 1 part plaster to 2 parts lightweight aggregate or sand. SGP 0003910 j2i BESTWALL LATH AND PLASTER CONSTRUCTION SECTION 4 Be GYPSUM LATH AND PLASTER FIREPROOFING BEAM AND COLUMN FIREPROOFING Fireproofing of the beams and columns is accomplished by abutting 3/8" Bestwall Perfolath around the perimeter of the beam or column and plastering to thickness required for desired fire resistance rating. The Perfolath is held by tying double strands of the wire around the lath and spaced 16" o.c. Cornerbeads applied by staples or tie wire provide ground for proper thickness as well as straight true corners. Sanded plaster is used for fire ratings up to three hours. Lightweight aggregates provide fire ratings up to 4 hours. A 4 hour column rating requires two layers of '/2' thick gypsum lath. CEILING FIREPROOFING > Lath and plaster ceilings when directly attached ^o or sus pended from structural members provide fire protection that eliminates concrete or tile encasment of steel framings. Dead weight loads are reduced by as much as 50%. This in turn reduces structural steel requirement to a minimum of 15%. Thicknesses of lath and plaster are based on required fire ratings. Sand aggregate provides up to 2 hour fire rating while up to 4 hour fire ratings may be obtained with the use of vermiculite or perlite aggregates. furring channels are directly attached to the bottom of the structural members or tied to main runners in sus pended systems. Bestwall Perfolath is attached to fur ring with transverse clips and plastered out to required thickness. For three and four hour fire resistive ratings, 12 gauge wire is laid diagonally across the plastering side of the lath and tied to each clip for additional support. Plaster mix shall be 1 part gypsum to 2 parts aggregate for scratch coat and 1:3 for brown co'at. For double up work, the pro ) portion can be changed to l:2`/2 for entire basecoat. SGP 0003911 II SECTION 5 SPECIFICATIONS SPECIFICATIONS FOR 1. MATERIALS A. Gypsum Lath shall conform to the current Standard Specifications for Gypsum Lath, ASTM Designation: C37. Gypsum lath shall be one of the following types: Plain, Perforated or Insulating. All gypsum lath shall be as manufactured by Bestwall Gyp sum Company and shall conform to the following dimen sional requirements: Thickness Vs" or i/2- Width 16' (a) or 24" Length 48' (b) (a) 16k" wide lath is available in Pacific Coast Markets. (b) Long-length lath %" thick is available for special systems such as solid gypsum lath and plaster partitions and furred walls. B. Gypsum Lath Clips shall be Bestwall Olsen Gypsum Lath furnished by Bestwall Gypsum Company. C. Other Metal Accessories such as corner beads, base screeds, concealed picture molds, etc., shall be not lighter than No. 26 U.S. gage steel, zinc-coated, with perforated or expanded flanges or clips shaped so as to permit complete embedment in the plaster. D. Channels shall be hot rolled or cold-rolled steel, free of rust, with required weight per thousand lineal feet. 2. APPLICATION OF GYPSUM LATH A. Except where noted below Bestwall Gypsum Lath shall be securely nailed to wood supports spaced not to exceed 16' on center (24" on center for V?" lath) with 13 gage, l'/a" long (lVi" long for l/2" lath), 19/64" flat-head, blued nails approximately 5" o.c. The nails shall be driven with the underside of the head flush with face of the lath and shall not be closer than %' from edges or ends. There shall be not less than four nails per lath per support with 16' wide lath. Where 24" wide lath is applied, there shall be at least 5 nails per lath per support, approximately 5" on center. B. Where %" gypsum lath is used for certain fire-resistive rated construction, five 13 gage, l'/g" long. Vs" flat head, blued nails per lath per support for 16" wide lath may be required. INTERIOR LATHING C. 3/s" Bestwall Gypsum Lath may be applied with staples to wood nailing members by means of a pneumatic tool. Staples shall be not less than 16 gage flattened galvanized wire, flat crown, divergent point, not less than 7/,," long. Staples shall be driven with the crown parallel to the long dimension of the nailing member, using not less than 4 staples per 16" width of lath per nailing member and not more than 5" o.c., in such a manner that the crown bears tightly against the lath but does not cut into the face paper. The legs of the staples shall not be closer than Vs" from the ends and edges of the lath. D. Bestwall Gypsum Lath shall be applied with its face side out and with the long dimension at right angles to the framing members. End joints shall be made to fall on dif ferent supports in alternate courses, or the lath shall be applied so that end joints are made continuously on one support. In the latter case,the continuous joints shall be covered with 3" wide strips of metal lath and the long or edge joints shall be offset or staggered. In all cases, the lath shall be butted together. E. Corner bead shall be used over lath to protect all exter nal vertical corners and to establish grounds, and shall be attached securely in such a manner as to assure proper alignment during application of plaster. F. Cornerite shall be provided at all interior angles and shall be nailed lightly or stapled to the lath, not to the framing members. G. Where Bestwall Olsen Gypsum Lath Clips are used, the erection of lath shall be m accordance with the directions and details shown in the various constructions. 3. METAL LATH AND METAL FURRING Shall be m accordance with ASA Standard Specifications for Interior Lathing and Furring, No. A42.4 (latest current ver sion). 4. WORKMANSHIP All metal construction and lathing shall be erect so that finished plaster surfaces may be true to line, and be level, plumb, square, curved or as otherwise required, without excessive thickness of plaster. SPECIFICATIONS FOR GYPSUM PLASTERING The following specifications covering machine mixed neat basecoat plasters with a lime putty white coat finish are applicable to a majority of plaster work. As indicated in Section 2A (Materials) Bestwall offers a full line of plaster materials which work well, applied under the ASA 42 Standard Specifications for Interior Plastering. For more information write the Bestwall Gypsum Co. 1. GENERAL PROVISIONS The work includes all labor, materials, services, equipment, and scaffolding required to complete the plastering of the project in accordance with the drawings and specifications. (See interior lathing specifications.) 2. MATERIALS A. Plastering Materials The plaster materials shall be selected from the following categories and brands as manufactured by Bestwall Gypsum Company and conforming to the current ASTM specifications as noted: BESTWALL Gypsum Plaster BESTWALL Lite-Mix BESTWALL Wood Fibered Plaster BESTWALL Concrete Bond Plaster BESTWALL Prepared Trowel Finish BESTWALL Prepared Sand Float Finish BESTWALL Satin Spar White Gauging Plaster BESTWALL Common Gauging Plaster BESTWALL Sunflower Molding and Casting plaster C28 C28 C28 C28 -- -- C28 C28 C59 BESTWALL Keene's Cement C61 BESTWALL Lite Acoustic Plaster -- BESTWALL Builder's Lime (Autoclaved Finish) C206 Type S BESTWALL Smooth Finishing Lime (Normal Hydrated) C6 Type N B. Aggregates (for use with gypsum plaster) Sand, Perlite, or Vermiculite shall conform to ASTM Specification C35-57T for use in basecoat plaster. For plastering, the aggregate weight per cu. ft. shall be for sand, 100 lbs; for Perlite and Vermiculite. 7 to 11 lbs. Fine Sand having rounded particles uniform in size (fre quently called "quicksand"), fine Perlite or fine Vermiculite shall not be used. C. Water shall be clean, fresh, potable and free from such amounts of mineral and organic substances as would affect the set of the plaster. D. Materials, Delivery of, and Protection All manufactured materials rhall be delivered in the original packages, con tainers. or bundles bearing the name of the manufacturer of the brand. Plaster and all cementious materials shall be kept dry until ready to be used; they shall be kept off the ground, under cover, and away from sweating walls and other damp sur faces. Metal goods shall be protected against rusting. 3. BASE COAT PROPORTION Bestwall Gypsum Plaster shall be mixed wtih sand, perlite 12 SGP 0003912 BE5TWALL SPECIFICATIONS SECTIONS Be or vermiculite in the proportion of 100 lbs. of plaster to not more than: TWO COAT WORK `Double up Method) peMite or Vermiculite cubic feet THREE COAT WORK Sand Perlite or Vermiculite cubic feet Over Gypsum lath 2 V2CD Fust 1 Scratch) coat over lath First 1 Scratch) coat ove. masonry 2* 3(f) Over Masonry (except over monolithic concrete! 3 Second coat over lath base Second coat over masonry base 3(f) 3 'In lieu of the proportions specified above the proportions may be 100 lbs. of Bestwall Gypsum Plaster to not more than lxh cu. ft of sand, perlite or vermiculite provided this proportioning is used for both scratch and brown coats. Under smooth trowel finish, perlite or vermiculite limit 2 cu. ft. 2)Over high suction base, sand may be 4 cu. ft. 4. MECHANICAL MIXING Material that has partially set shall not be retempered or used. Frozen, caked or lumpy material shall not be used. The mixer shall be cleaned of all set or hardened material before materials for a new batch are loaded. Each batch shall be mixed separately. Materials shall be added while mixer is in continuous operation. Put in the approximate amount of water; if sand is used add approximately half the amount of aggregate (if perlite or vermiculite is used add all the aggregate); add all' the plaster; add the remainder of the sand aggregate; mix to the proper consistency, adding water if necessary; and dump the entire batch and use. Note: The mixer should be flushed with water when used intermittently. 5. LIME PUTTY A. Bestwall Smooth Finish Lime shall be box soaked or machine mixed with 6 to 6'A gal. of water for each 50 lb. bag and allowed to soak overnight. B. Bestwall Builders Lime shall be mixed with approxi mately 61,4 gal. of water per 50 lb. bag. It may be machine mixed and used immediately or soaked and used the next day. 6. FINISH COAT PROPORTIONS A. Smooth Trowel Finish NOTE; For smooth trowel finish l/2 to 1 cu. ft. of fine sand or perlite shall be added for each 100 lbs. of gypsum (Gauging or Keene's Cement). 1. Gypsum Lime Putty Trowel Finish shall be mixed in the proportions of 1 part of gauging plaster (calcined gypsum) to not more than 3 parts of lime putty by volume. 2. Keene's Cement Lime Putty Finish may be standard hard, medium hard, or extra hard finish. When mixed mechani cally the water shall be put in the mixer first; then the lime (dry or putty): the sand, if used; and finally the Keene's Cement. Standard Hard Finish shall be mixed in the proportions of 100 lbs. of Keene's Cement to not more than 100 lbs. of dry hydrated lime. B. Sand Float Finish 1. Gypsum Sand Float Finish shall be mixed in the ratio of 100 Ihs. of gypsum plaster (unfibered) to not more than 200 lbs. of sand. 2. Keene's Cement Lime Putty Sand Float Finish shall be mixed in the range of 2 l/i to 3 parts of sand to 1 part of a mixture of Lime and Keene's Cement by weight with Vi to l1/. parts of Lime to 1 part of Keene's Cement by weight. The specified range is equivalent to the following: from 75 lbs. Lime to 100 lbs. Keene's Cement to 400 to 525 lbs. sand to 150 lbs. lime to 100 lbs. Keene's to 560 to 700 lbs. sand. C. Bestwall Lite Acoustic Plaster shall be mixed with water to the proper consistency. 7. THICKNESS OF BASECOAT PLASTER Plaster shall be of the following thicknesses measured from the face of plaster base to finished plaster surfaces. Wood or metal grounds or plaster screeds shall be installed to assure such thicknesses: Thickness of Plaster Including Finish Coat. in. iGypsum Lath ! Metal Lath', Wire Lath and I Wire Fabric [A min. % min. Masonry and Concrete Walls Monolithic Concrete Ceilings % min. `/8 min. % max. A. Plaster thickness when measured from the back plane of metal lath, exclusive of ribs, shall be Vi" minimum. B. If monolithic concrete ceiling surfaces require more than 3/g" of plaster to produce required lines or surfaces, metal lath or wire lath bonding for the plaster shall be attached to the concrete before application of plaster. Where the concrete ceiling surfaces are such as to require the appli cation of an excessive thickness of plaster to produce required lines or surfaces, lath shall be applied over furring secured to the concrete. Wood Grounds shall be furnished and installed by others. Metal Grounds shall be furnished and installed by the (plastering) (lathing) contractor. Plaster Screeds shall be installed by the plastering con tractor. 8. PREPARATIONS FOR PLASTERING A. Temperature and Ventilation: When the prevailing outdoor temperature at the building site is less than 55 F. a uniform temperature of not less than 55 F. shall be continuously maintained in the building for a period of not less than one week prior to the application of plaster, while the plastering is being done, and after the plaster is dry. The heat shall be well distributed in all areas, and deflection or protective screens shall be used to prevent concentrated or uneven heat on plaster areas near the heat source. Products of combustion shall be vented to the outside. Ventilation shall be provided to properly dry the plaster during and subsequent to its application. In glazed build ings this shall be accomplished by keeping windows open approximately 2" top and bottom (or side-pivoted windows approximately 4") to provide air circulation; and by use of temporary circulators or the air conditioning system in enclosed areas or buildings lacking openings for natural ventilation. If glazed sash are not in place and the building is subjected to hot, dry winds or temperature differentials from day to night of 20 F. or more, openings shall be screened with cheesecloth or similar materials. B. Masonry Surfaces on which suction must be reduced shall be properly wet down immediately before the plaster is applied. Because bituminous compounds do not provide ideal bases for plaster, the application of plaster to masonry or concrete which has been coated with such compounds is forbidden. C. Monolithic Concrete Surfaces shall be cleaned of all dust, loose particles, and other foreign matter. Laitance and efflorescence shall be removed by washing first with 10% solution of commercial hydrochloric acid (muriatic acid) and water and then with clean water to remove all traces of acid. Grease and oil shall be completely removed (Note 9b). Concrete surfaces shall have sufficient roughness to provide proper bond. If necessary, the surface shall be evenly wet- SGP 0003913 13 SECTION 5 SPECIFICATIONS ted, but not saturated, to provide proper suction. If surfaces are not rough, they shall be hacked or bush-hammered or a dashcoat of Portland-Cement grout, composed of 1 part of cement to 1 '/2 parts of fine sand mixed to a mush con sistency, shall be applied. The Portland-Cement grout shall be forcibly dashed on the concrete surface, using a stiff fiber brush, with a whipping motion. This coat shall be kept damp for at least two days immediately following its application and then allowed to dry. Before application of plaster, the surface shall be evenly dampened if necessary to provide proper suction. D. Metal Grounds and other accessories, such as corner beads, screeds, picture molds, etc., shall be carefully examined to see that they are straight, curved, plumb, level, square, or true to the acquired angles, as the case may require, before the plaster is applied. E. Surfaces shall be carefully examined before the plaster is applied thereto, and the proper authorities notified of any and all unsatisfactory conditions. Application of the plaster then shall not proceed until such unsatisfactory con ditions have been satisfactorily remedied or adjusted. D. 2" Solid Gypsum Lath and Plaster Partitions shall be scratched in on both sides with 3/8" fast setting plaster (maximum 3 hrs.) practically simultaneously. The side away from the temporary bracing shall be browned after both scratch coats have set and partially dried. After this brown coat has set firmly, remove the braces and brown the other side leaving for finish coat to bring wall to full 2" thickness. 10. APPLICATION OF FINISHES The finish coat shall be applied to a partially dry base coat or to a thoroughly dry base coat which has been evenly wetted by brushing or spraying. The use of excessive water shall be avoided in the application of all types of finish coat plastering. NOTE: Fine sand or perlite shall be used in smooth trowel finishes. Over gypsum or metal lath bases where light weight aggregate is used and the aggregate content in the basecoat exceeds 2 cu. ft. per 100 lbs. of gypsum, a sand float, acoustical or other finish shall be used. Smooth Trowel Fin ishes shall not be used in this place. 9. APPLICATIONS OF BASE COAT A. Two-Coat Work--Base (first) coat shall be applied with sufficient material and pressure to form good bond on gypsum lath or masonry as the case may be, and to cover well. Then, before this scratch coat has set, and without raking its surface, material of the same proportions shall be doubled back to bring the plaster out to grounds struck to a true surface wtih rod and darby, without application of water and cross raked or scratched to provide a mechanical key for reception of the finish (second) coat. Slow-setting plaster shall be accelerated to provide a set (mixed mate rial) of less than 4 hrs. B. Three-Coat Work--Scratch (first) coat shall be applied with sufficient material and pressure to form good full keys on metal lath, wire lath, or wire fabric, or good bond on gypsum lath or masonry, as the case may be, and to cover well and then be scratched to a rough surface. Slow-setting plaster shall be accelerated to provide a set (mixed mate rial) of less than 4 hrs. Brown (2nd) coat shall be applied after the scratch (1st) coat has set firm and hard, brought out to grounds, straightened to a true surface with rod and darby, without application of water and cross raked or scratched to provide a mechanical key for reception of the finish (3rd) coat. To insure full plaster thickness, plaster screeds should be ap plied to the scratch coat prior to the application of the brown coat. C. Plastering on Monolithic Concrete-Surfaces of walls and columns shall have a scratch coat of bond plaster, followed by a brown coat of gypsum plaster (in the proportions of 100 lb. of Bestwall Gypsum Plaster to not more than 3 cu. ft. of sand or perlite) troweled into the scratch coat before it has set. The brown coat shall be brought out to grounds, using a double-back application if required, straightened to a true surface with rod and darby, with application of water and cross raked or scratched to provide a mechanical key for reception of the finish coat. Surfaces of ceilings shall have a coat of bond plaster, scratched in thoroughly, doubled back, and filled to a true, even surface and left rough (maximum thickness 3/s"), to receive the finish coat. A. Trowel Finishes--Trowel Finishes (smooth) shall be ap plied over the base coat scratched in thoroughly, laid on well, doubled back and filled out to a true, even surface. The gen eral thickness shall be to l/a". The finish shall be allowed to draw a few minutes and then it shall be well-trowelled with water to a smooth finish, free from cat faces and other blemishes or irregularities. B. Float Finishes--Float finishes shall be applied over the base coat, scratched in thoroughly, laid on with a trowel to an even surface, and then floated (with wood, carpet, cork, rubber or other type floats, depending on the texture desired) to a true, even surface free from slick spots or other blemishes. -*>C. Acoustical Plaster and Other Special Plasters: 1. Bestwall Lite Acoustic (White) Plaster shall be mixed with clean water only for machine or trowel application over gyp sum basecoat plaster, monolithic concrete and other sur faces which are firm, clean and free of efflorescence or water soluble substances. Gypsum basecoats should be half dry to dry. Concrete should be dry. Spray--For first coat use 55 to 60 qts. of water per 40 lb. bag. Apply 3/a" thick. Level with darby and allow to dry before applying finish coat. For finish coat use 5 to 10 addi tional qts. of water per bag depending upon texture desired. When applied over low suction bases such as dense con crete, metal, etc., the material should be applied in three applications, the first application furnishing the suction for subsequent coats. Any large fissures in the first coat should be filled and leveled before applying the finish coat. Hand--Use 50 to 60 qts. of water per 40 lb. bag for both basecoat and finish coat. Apply basecoat 3/a" thick, allow to dry, then apply finish coat l/a" thick. Trowel finish may be smooth troweled, floated, stippled, or darbied after it has taken-up sufficiently. Ultra-White Finish--Where a light reflection of 70% or more is desired with machine application use Bestwall Lite Acous tic Ultra White Plaster for the finish coat only. 2. Special Plasters shall be applied in accordance with the directions of the Manufacturer. 14 SGP 0003914 I * >' BESTWALL PRODUCT DATA SECTION 6 PLASTERt Basecoat Plasters NEAT Unfibered Fibered (glass fiber or sisal fiber) BRANDS BESTWALL BESTWALL USE Scratch coat on all backings except metal lath and monolithic con crete. Brown coat on all backings COVERAGE (square yards per ton) (sanded 2:1) Gypsum Lath: 190-220 Metal Lath: 100-130 Gypsum Tile: 210 240 Clay Tile: 165-200 Plaster ; THICKNESS ; Vi" Ve" y2" Scratch and brown coat on all backings except monolithic concrete. same as above same as above Extra-Fibered (glass fiber or sisal fiber) BESTWALL Scratch coat on metal lath but may be used over all bases except monolithic concrete. same as above same as above MILL MIXED Fibered, Unfibered Masonry Mi* BESTWALL Lite-Mix (Available in SO lb. bags only) Where tightness is desired, tor faster, easier application. Gypsum Lath: 135-150 Metal Lath: 75-90 Gypsum Tile: 135-150 Clay Tile: 110-125 Vi" Vs Vi Vs" Wood Fibered Concrete Bond BESTWALL (Available in 100, 50 and 10 lb. bags) BESTWALL Without sand-scratch coat and brown coat on all backings except masonry. With sand-scratch coat on masonry and brown coat on all backings. Double back coat on monolithic concrete, or as scratch coat only. (without sand) Gypsum Lath: 100-120 Metal Lath: 50-65 Gypsum Tile: 85-100 Clay Tile: 65-85 Monolithic Concrete: 90-120 Vi" Vs" Vi" Vs" Vs"-Vs Finishing Plasters PREPARED TROWEL FINISH BESTWALL Where uniformity and extra hardness are desired. Can be dec orated when dry--no waiting period. For use over gypsum basecoat only. White or gray color. 350-400 Vs" Maximum PREPARED SAND FLOAT FINISH BESTWALL Same as prepared trowel finish except surface will be textured. White or gray color. 250-275 Vs" Maximum WHITE GAUGING COMMON GAUGING KEENE'S CEMENT BESTWALL Satin Spar BESTWALL BESTWALL Mixed with lime for use over gypsum basecoat. Great work ability: hard, smooth, white surface. Highest-grade rock. Avail able in quick set and slow set. Mixed with time for use over gypsum basecoat. Selected qual ity rock, light gray color. Gives hard, smooth surface. Avail able in quick set and slow set. Mixed with lime. Gives strong, dense surface with high resistance to abrasion and water. Two sets: regular and fast finish. 1600 1600 (4:1 Mix) 550 Vs" Maximum Vs' Maximum Vs" Maximum MOLDING AND CASTING ACOUSTICAL PLASTER (White, Ultra White) BESTWALL Sunflower BESTWALL Lite Acoustic Plaster (Available in 40 lb. bags) Made from rock over 93% pure. Gives hard, strong molds and casts with low expansion. Mixed with water only for casts. Mixed with lime and water for molds. Applied by plaster machine or hand troweling over gypsum base coat, monolithic concrete or other surfaces which are firm, clean and free of efflorescence or water soluble substances. Sound coefficient .55 to .60. Natural white color 350 to 400 LIME BESTWALL Smooth Finishing Lime (Normal Hydrated Builder's Lime (Autoclaved) Mixed with gauging and molding plasters and Keene's cement to give plasticity, whiteness and bulk. Ohio Dolomite Lime furnished normal hydrated and autoclaved. (Available in 50 lb bags only.) t All plasters available in 100 lb. bags except where noted. LATH EDGE THICKNESS WIDTH LENGTH WEIGHT LBS./1G00 FT.- FRAMING SPACING NAILS LBS./1000 FT.- Up to 750 NAIL SI2E NAIL SPACING BESTWALL LATH (Plain, Perforated, Insulating. Pinholalh) BESTWALL Long length Lath Round Round or tongue and groove V edge V V." w 24" 48" up to 12' 1500 2000 2000 16" o c. 24" o c. 6 a 13 52 gauge 5" Q.C. Not Applicable V only 16 1/5" width on Pacific coast, packed 5 panels per bundle. Vs" Maximum PANELS PER BUNDLE 6s 4 Shipped loose SGP 0003915 15 COMPANY Bestwall, the nation's third largest gypsum company, has served builder, architect, contractor and property owner with a full line of quality gypsum building materials and construction components for more than 50 years. FACILITIES Strategically located plants across the nation utilize the most modern equipment and production techniques. In addition, quality control and research laboratories continuously check and control the performance of the finished product to meet highest quality standards. An efficient distribution network makes Bestwall a prompt and reliable source of supply. SERVICES Offices in principal cities are staffed by qualified sales representatives equipped to provide further information and assistance and to insure that your selection of materials is complete and applicable. SGP 0003916 8E5TWALL GYPSUM PLASTERS SECTION 3 Mixes smoothly--has no tendency to block the nozzle of the plaster gun. High Insulation Value--Lite-Mix provides greater insulation than sanded gypsum plaster. Fire-Resistant--Wood Fibered Plaster provides excellent fire rating up to 50% higher than sanded plaster. BESTWALL CONCRETE BOND GYPSUM PLASTER BESTWALL WOOD FIBERED GYPSUM PLASTER Description: Non staining shredded wood fiber additive provides good working properties when used without aggregate. Description: A basecoat plaster designed to bond permanently with monolithic concrete to preserve a hard, durable surface. Re quires addition of water only in field. Uses: Uses: Intended for use without aggregate as scratch and brown coat. May be mixed with one part of sand for scratch coat over high suction masonry. Specially formulated to compensate for 2 problems: 1. where surface is too dense for ordinary plaster to form a mechanical key, and 2. where thermal expansion of concrete is lower than that of ordinary plasters. Features: Features: Economy--Can be applied quickly and easily. Bonding Strength--Concrete Bond adheres well to properly fc Strength--Bestwall Wood Fibered Gypsum Plaster has approximately 3 times greater compressive and tensile strength prepared concrete surfaces, columns and beams and on smooth cement block walls. 9 than sanded plaster; up to 2% times greater resistance to Low Cost--An economical basecoat plaster to provide for lateral impact and 50% greater surface hardness. application direct to concrete surfaces. BESTWALL PREPARED SAND FLOAT FINISH Description: This pre mixed gypsum finish coat plaster has same quali ties and advantages as Prepared Trowel Finish. The only difference: this finish contains proper amount of uniformly graded white silica sand to produce hard textured surface. BESTWALL LITE ACOUSTIC PLASTER A mill-mixed product, Bestwall Lite Acoustic Plaster is a versatile, highly light reflective, acoustical finishing material designed for machine application. Made of incombustible mineral materials, it provides exceptional bond to form a porous sound absorbing surface. May be left with natural finish or spray painted according to directions after it's thoroughly dry. Use of Lite Acoustic is not limited to new construction. Permanent bond is assured when it is properly applied to almost any surface (see Specifications). Existing ceilings can be covered effectively without removal or use of addi` onal lath or backer boa"T providing the plaster is firm and the surface clean. Because various textures can be achieved in either White or Ultra-White. Lite Acoustic offers a wide scope of decora tive possibilities in residential, commercial or industrial con struction. May also be applied by hand trowel. (See Spe cifications for details). Features: Fire Protection--Lite Acoustic will not burn or support com bustion. Economy--Provides wide field of low cost acoustical treat ment in both new work and remodeling. Versatility--Applied over standard gypsum basecoat plaster, wall or monolothic concrete, Lite Acoustic Ultra-White can be gun applied to provide coarse, medium coarse or fine textured finishes by adjustment of machine nozzle to meet various decorative requirements. Texture Finish Thickness '4" 125 .25 Sound Absorption Coefficients FREQUENCIES 250 500 1000 2000 4000 .27 .52 .69 78 38 Noise Reduction Coefficient 55 Authority Riverbank Light Reflection Coefficients White Ultra-White Spray 66% 70% Trowel 69% 74% SGP 0003918 7 .i SECTION 3 MACHINE APPLICATION Bestwall manufactures a full line of basecoat plasters, spe cially formulated for easy application through plastering machines. They are designed to pump at low hose pressure which insures steady and uniform flow from the nozzle without aggregate separation or plug ups and to have low water demand assuring hard, strong plastering. For scratch coat over metal lath, Bestwall Glass Fibered Plaster forms adequate keys with minimum blow through, thus assuring strong rigid plastering with minimum waste. These features provide the following advantages: Economy--Due to trouble-free application, more yards of plaster can be applied per man hour with less waste. Durability--When mixed and applied according to specifica tions, resultant plastering develops full strength and hard ness resulting in strong, durable walls and ceilings. Design Flexibility--Machine application lends itself to the flexibility of design for which gypsum plaster is noted, thus placing no limitation on use of this method of application. Machine application plasters are as follows: BESTWALL NEAT GYPSUM PLASTERS Unfibered plaster may be used for the scratch (first) coat on gypsum lath or masonry (solid surfaces) and for the brown (second) coat on any backing. Fibered plaster con tains a carefully measured amount of glass fiber to provide greater wet cohesion and minimize droppings behind open type lath. Fibered plaster is recommended for the scratch coat on perforated gypsum or metal lath and may be used for the brown coat on' any backing. Extra fibered plaster contains a greater proportion of glass fiber and is preferred in some areas for the scratch coat on metal lath. BESTWALL LITE MIX Unfibered or Fibered (Glass only) Mixes smoothly, spreads easily and has no tendency to block the nozzle of the plaster gun. Lite-Mix produces a superior basecoat. It is also available in a Masonry Mix for application on masonry bases. Water only is added on the job. BESTWALL LITE ACOUSTIC Wb.i.uitr. whii. Can be applied over standard gypsum basecoat plaster or other clean, dry, firm bases such as concrete, metal decks, etc, Lite Acoustic (Ultra White) can be gun applied to pro vide ceilings of acoustical value as well as textured beauty and high light reflectivity. Can also be applied by hand, if desired. 8 m. SGP 0003919 I SECTION 5 SPECIFICATIONS SPECIFICATIONS FOR 1. MATERIALS A. Gypsum Lath shall conform to the current Standard Specifications for Gypsum Lath, ASTM Designation: C37, Gypsum lath shall be one of the following types: Plain, Perforated or Insulating. All gypsum lath shall be as manufactured by Bestwall Gyp sum Company and shall conform to the following dimen sional requirements: Thickness %" or i/2" Width 16' (a) or 24' Length 48' (b) (a) 16'/s" wide lath is available in Pacific Coast Markets. (b) Long-length lath y2" thick is available for special systems such as solid gypsum lath and plaster partitions and furred walls. B. Gypsum Lath Clips shall be Bestwall Olsen Gypsum Lath furnished by Bestwall Gypsum Company. C. Other Metal Accessories such as corner beads, base screeds, concealed picture molds, etc., shall be not lighter than No. 26 U.S. gage steel, zinc-coated, with perforated or expanded flanges or clips shaped so as to permit complete embedment in the plaster. D. Channels shall be hot-rolled or cold-rolled steel, free of rust, with required weight per thousand lineal feet. 2. APPLICATION OF GYPSUM LATH A. Except where noted below Bestwall Gypsum Lath shall be securely nailed to wood supports spaced not to exceed 16" on center (24" on center for \'7" lath) with 13 gage, l'/a" long < 1l,i" long for '.A' lath), 19/64" flat head, blued nails approximately 5" o.c. The nails shall be driven with the underside of the head flush with face of the lath and shall not be closer than %" from edges or ends. There shall be not less than four nails per lath per support with 16" wide lath. Where 24" wide lath is applied, there shall be at least 5 nails per lath per support, approximately 5' on center. B. Where %" gypsum lath is used for certain fire-resistive rated construction, five 13 gage, 1 Vs" long, Va " flat-head, blued nails per lath per support for 16" wide lath may be required. INTERIOR LATHING C. %" Bestwall Gypsum Lath may be applied with staples to wood nailing members by means of a pneumatic tool. Staples shall be not less than 16 gage flattened galvanized wire. '/,4" flat crown, divergent point, not less than long. Staples shall be driven with the crown parallel to the long dimension of the nailing member, using not less than 4 staples per 16" width of lath per nailing member and not more than 5" o c., in such a manner that the crown bears tightly against the lath but does not cut into the face paper. The legs of the staples shall not be-closer than 3/a" from the ends and edges of the lath. D. Bestwall Gypsum Lath shall be applied with its face side out and with the long dimension at right angles to the framing members. End joints shall be made to fall on dif ferent supports in alternate courses, or the lath shall be applied so that end joints are made continuously on one support. In the latter case, the continuous joints shall be covered with 3" wide strips of metal lath and the long or edge joints shall be offset or staggered. In all cases, the lath shall be butted together. E. Corner bead shall be used over lath to protect all exter nal vertical corners and to establish grounds, and shall be attached securely in such a manner as to assure proper alignment during application of plaster. F. Cornerite shall be provided at all interior angles and shall be nailed lightly or stapled to the lath, not to the framing members. G. Where Bestwall Olsen Gypsum Lath Clips are used, the erection of lath shall be m accordance with the directions and details shown in the various constructions. 3. METAL LATH AND METAL FURRING Shall be in accordance with ASA Standard Specifications for Interior Lathing and Furring, No. A42.4 (latest current ver sion). 4. WORKMANSHIP All metal construction and lathing shall be erect so that finished plaster surfaces may be true to line, and be level, plumb, square, curved or as otherwise required, without excessive thickness of plaster. SPECIFICATIONS FOR GYPSUM PLASTERING The following specifications covering machine mixed neat basecoat plasters with a lime putty white coat finish are applicable to a majority of plaster work. As indicated in Section 2A (Materials) Bestwall offers a full line of plaster materials which work well, applied under the ASA 42 Standard Specifications for Interior Plastering. For more information write the Bestwall Gypsum Co. 1. GENERAL PROVISIONS The work includes all labor, materials, services, equipment, and scaffolding required to complete the plastering of the project in accordance with the drawings and specifications. (See interior lathing specifications.) 2. MATERIALS A. Plastering Materials The plaster materials shall be selected from the following categories and brands as manufactured by Bestwall Gypsum Company and conforming to the current ASTM specifications as noted: BESTWALL Gypsum Plaster C28 BESTWALL Lite-Mix C28 BESTWALL Wood Fibered Plaster C28 BESTWALL Concrete Bond Plaster C28 BESTWALL Prepared Trowel Finish -- BESTWALL Prepared Sand Float Finish -- BESTWALL Satin Spar White Gauging Plaster C28 BESTWALL Common Gauging Plaster C28 BESTWALL Sunflower Molding and Casting Plaster C59 BESTWALL Keene's Cement C61 BESTWALL Lite Acoustic Plaster -- BESTWALL Builder's Lime (Autoclaved Finish) C206 Type S BESTWALL Smooth Finishing Lime (Normal Hydrated) C6 Type N B. Aggregates (for use with gypsum plaster) Sand. Perlite, or Vermiculite shall conform to ASTM Specification C35 57T for use in basecoat plaster. For plastering, the aggregate /weight per cu. ft. shall be for sand, 100 lbs: for Perlite and Vermiculite. 7 to 11 lbs. Fine Sand having rounded particles uniform in size (fre quently called "quicksand"), fine Perlite or fine Vermiculite shall not be used. C. Water shall be clean, fresh, potable and free from sucn amounts of mineral and organic substances as would affect the set of the plaster. D. Materials, Delivery of, and Protection All manufactured materials 'hall be delivered in the original packages, con tamers, or bundles bearing the name of the manufacturer of the brand. Plaster and all cementious materials shall be kept dry until ready to be used: they shall be kept off the ground, under cover, and away from sweating walls and other damp sur faces. Metal goods shall be protected against rusting. 3. BASE COAT PROPORTION Bestwall Gypsum Plaster shall be mixed wtih sand, perlite 12 SGP 0003920 4 I fc * I> IxlL BE5TWAIL SPECIFICATIONS SECTION 5 Bes or vermiculite in the proportion of 100 lbs of plaster to not more than: TWO COAT WORK . Double up Method! Sjnd pediie or Vermiculite cubic feet THREE COAT WORK Sami Perlite or Ve'nnculite uubic feet Over Gypsum LaIh 2l/z(T) First ' Scratch) coat over lath First 'Scratch! coat nve. masonry 2* 3^) Over Masonry 'except ov^r monolithic concrete) 3 Second coat over lath base Second coat over masonry base 3(5) 3<j) 'In lieu ol the proportions specified sbove the proportions may be 100 lbs of Bestwall Gypsum Plaster to not more than 2'a cu. It of sand, perlite or vermiculite provided this proportioning i$ used for both scratch and brown coats. .IjHJnder smooth trowel finish, perlite or vermiculite limit 2 cu. ft. 5)0ver high suction base sand may be 4 cu ft. 4. MECHANICAL MIXING Material that has partially set shall not be retempered or used. Frozen, caked or lumpy material shall not be used. The mixer shall be cleaned of all set or hardened material before materials for a new batch are loaded. Each batch shall be mixed separately. Materials shall be added while mixer is in continuous operation. Put in the approximate amount of water: if sand is used add approximately half the amount of aggregate (if perlite or vermiculite is used add all the aggregate); add all the plaster; add the remainder of the sand aggregate: mix to the proper consistency, adding water if necessary; and dump the entire batch and use. Note: The mixer should be flushed with water when used intermittently. 5. LIME PUTTY A. Bestwall Smooth Finish Lime shall be box soaked or machine mixed with 6 to 6'A gal. of water for each 50 lb. bag and allowed to soak overnight. B. Bestwall Builders Lime shall be mixed with approxi mately 6'-4 gal of water per 50 lb. bag. It may be machine mixed and used immediately or soaked and used the next day. 6. FINISH COAT PROPORTIONS A. Smooth Trowel Finish NOTE: For smooth trowel finish '/-> to 1 cu. ft. of fine sand or perlite shall be added for each 100 lbs. of gypsum (Gauging or Keene's Cement). 1. Gypsum Lime Putty Trowel Finish shall be mixed in the proportions of 1 part of gauging plaster (calcined gypsum) to not more than 3 parts of lime putty by volume. 2. Keene's Cement Lime Putty Finish may be standard hard, medium hard, or extra hard finish. When mixed mechani C3lly the water shall be put in the mixer first: then the lime (dry or putty): the sand, if used; and finally the Keene's Cement. Standard Hard Finish shall be mixed in the proportions of 100 lbs. of Keene's Cement to not more than 100 lbs. of dry hydrated lime. B. Sand Float Finish 1. Gypsum Sand Float Finish shall be mixed in the ratio of 100 lbs. of gypsum plaster (unfibered) to not more than 200 lbs. of sand. 2. Keene's Cement Lime Putty Sand Float Finish shall be mixed in the range of 2\,j to 3 parts of sand to 1 part of a mixture of Lime and Keene's Cement by weight with Vj to 1'parts of Lime to 1 part of Keene's Cement by weight. The specified range is equivalent to the following: from 75 lbs. Lime to 100 lbs. Keene's Cement to 400 to 525 lbs. sand to 150 lbs. lime to 100 lbs. Keene's to 560 to 700 lbs. sand. C. Bestwall Lite Acoustic Plaster shall be mixed with water to the proper consistency. 7. THICKNESS OF BASECOAT PLASTER Plaster shall be of the following thicknesses measured from the face of plaster base to finished plaster surfaces. Wood or metal grounds or plaster screeds shall be installed to assure such thicknesses: Thickness of Plaster Including Finish Coat, in. iGypsum Lath ! Metal Lath ', Wire Lath and * Wire Fabric Masonry and Concrete Walls Monolithic Concrete Ceilings K min. % min. 5/a mm. l/a min. % max. A. Plaster thickness when measured from the back plane of metal lath, exclusive of ribs, shall be minimum. B. If monolithic concrete ceiling surfaces require more than V8" of plaster to produce required lines or surfaces, metal lath or wire lath bonding for the plaster shall be attached to the concrete before application of plaster. Where the concrete ceiling surfaces are such as to require the appli cation of an excessive thickness of plaster to produce required lines or surfaces, lath shall be applied over furring secured to the concrete. Wood Grounds shall be furnished and installed by others. Metal Grounds shall be furnished and Installed by the (plastering) (lathing) contractor. Plaster Screeds shall be installed by the plastering con tractor. 8. PREPARATIONS FOR PLASTERING A. Temperature and Ventilation: When the prevailing outdoor temperature at the building site is less than 55 F. a uniform temperature of not less than 55 F. shall be continuously maintained in the building for a period of not less than one week prior to the application of plaster, while the plastering is being done, and after the plaster is dry. The heat shall be well distributed in all areas, and deflection or protective screens shall be used to prevent concentrated or uneven heat on plaster areas near the heat source. Products of combustion shall be vented to the outside. Ventilation shall be provided to properly dry the plaster during and subsequent to its application. In glazed build ings this shall be accomplished by keeping windows open approximately 2" top and bottom (or side-pivoted windows approximately 4') to provide air circulation; and by use of temporary circulators or the air conditioning system in enclosed areas or buildings lacking openings for natural ventilation. If glazed sash are not in place and the building is subjected to hot. dry winds or temperature differentials from day to night of 20 F. or more, openings shall be screened with cheesecloth or similar materials. B. Masonry Surfaces on which suction must be reduced shall be properly wet down immediately before the plaster is applied. Because bituminous compounds do not provide ideal bases for plaster, the application of plaster to masonry or concrete which has been coated with such compounds is forbidden. C. Monolithic Concrete Surfaces shall be cleaned of all dust, loose particles, and other foreign matter. Laitance and efflorescence shall be removed by washing first with 10"';, solution of commercial hydrochloric acid (muriatic acid) and water and then with clean water to remove all traces of acid. Grease and oil shall be completely removed (Note 9b). Concrete surfaces shall have sufficient roughness to provide proper bond. If necessary, the surface shall be evenly wet SGP 0003921 13 4 SECTION 5 SPECIFICATIONS ted, but not saturated, to provide proper suction. If surfaces are not rough, they shall be hacked or bush-hammered or a dashcoat of Portland-Cement grout, composed of 1 part of cement to 1 Vz parts of fine sand mixed to a mush con sistency, shall be applied. The Portland-Cement grout shall be forcibly dashed on the concrete surface, using a stiff fiber brush, with a whipping motion. This coat shall be kept damp for at least two days immediately following its application and then allowed to dry. Before application of plaster, the surface shall be evenly dampened if necessary to provide proper suction. O. Metal Grounds and other accessories, such as corner beads, screeds, picture molds, etc., shall be carefully examined to see that they are straight, curved, plumb, level, square, or true to the acquired angles, as the case may require, before the plaster is applied. E. Surfaces shall be carefully examined before the plaster is applied thereto, and the proper authorities notified of any and all unsatisfactory conditions. Application of the plaster then shall not proceed until such unsatisfactory con ditions have been satisfactorily remedied or adjusted. 9. APPLICATIONS OF BASE COAT A. Two-Coat Work--Base (first) coat shall be applied with sufficient material and pressure to form good bond on gypsum lath or masonry as the case may be, and to cover well. Then, before this scratch coat has set, and without raking its surface, material of the same proportions shall be doubled back to bring the plaster out to grounds struck to a true surface wtih rod and darby, without application of water and cross raked or scratched to provide a mechanical key for reception of the finish (second) coat. Slow-setting plaster shall be accelerated' to provide a set (mixed mate rial) of less than 4 hrs. B. Three-Coat Work--Scratch (first) coat shall be applied with sufficient material and pressure to form good full keys on metal lath, wire lath, or wire fabric, or good bond on gypsum lath or masonry, as the case may be, and to cover well and then be scratched to a rough surface. Slow-setting plaster shall be accelerated to provide a set (mixed mate rial) of less than 4 hrs. Brown (2nd) coat shall be applied after the scratch (1st) coat has set firm and hard, brought out to grounds, straightened to a true surface with rod and darby, without application of water and cross raked or scratched to provide a mechanical key for reception of the finish (3rd) coat. To insure full plaster thickness, plaster screeds should be ap plied to the scratch coat prior to the application of the brown coat. C. Plastering on Monolithic Concrete-Surfaces of walls and columns shall have a scratch coat of bond plaster, followed by a brown coat of gypsum plaster (in the proportions of 100 lb. of Bestwall Gypsum Plaster to not more than 3 cu. ft. of sand or perlite) troweled into the scratch coat before it has set. The brown coat shall be brought out to grounds, using a double-back application if required, straightened to a true surface with rod and darby, with application of water and cross raked or scratched to provide a mechanical key for reception of the finish coat. Surfaces of ceilings shall have a coat of bond plaster, scratched in thoroughly, doubled back, and filled to a true, even surface and left rough (maximum thickness 3/s"), to receive the finish coat. D. 2" Solid Gypsum Lath and Plaster Partitions shall be scratched in on both sides with %" fast setting plaster (maximum 3 hrs.) practically simultaneously. The side away from the temporary bracing shall be browned after both scratch coats have set and partially dried. After this brown coat has set firmly, remove the braces and brown the other side leaving '/,*~ for finish coat to bring wall to full 2" thickness. 10. APPLICATION OF FINISHES The finish coat shall be applied to a partially dry base coat or to a thoroughly dry base coat which has been evenly wetted by brushing or spraying. The use of excessive water shall be avoided in the application of all types of finish coat plastering. NOTE: Fine sand or perlite shall be used in smooth trowel finishes. Over gypsum or metal lath bases where light weight aggregate is used and the aggregate content in the basecoat exceeds 2 cu. ft. per 100 lbs. of gypsum, a sand float, acoustical or other finish shall be used. Smooth Trowel Fin ishes shall not be used in this place. A. Trowel Finishes--Trowel Finishes (smooth) shall be ap plied over the base coat scratched in thoroughly, laid on well, doubled back and filled out to a true, even surface. The gen eral thickness shall be y,4" to !/a"- The finish shall be allowed to draw a few minutes and then it shall be well trowelled with water to a smooth finish, free from cat faces and other blemishes or irregularities. B. Float Finishes--Float finishes shall be applied over the base coat, scratched in thoroughly, laid on with a trowel to an even surface, and then floated (with wood, carpet, cork, rubber or other type floats, depending on the texture desired) to a true, even surface free from slick spots or other blemishes. C. Acoustical Plaster and Other Special Plasters: 1. Bestwall Lite Acoustic (White) Plaster shall be mixed with clean water only for machine or trowel application over gyp sum basecoat plaster, monolithic concrete and other sur faces which are firm, clean and free of efflorescence or water soluble substances. Gypsum basecoats should be half dry to dry. Concrete should be dry. Spray--For first coat use 55 to 60 qts. of water per 40 lb. bag. Apply 3/8" thick. Level with darby and allow to dry before applying finish coat. For finish coat use 5 to 10 addi tional qts. of water per bag depending upon texture desired. When applied over low suction bases such as dense con crete, metal, etc., the material should be applied in three applications, the first application furnishing the suction for subsequent coats. Any large fissures in the first coat should be filled and leveled before applying the finish coat. Hand--Use 50 to 60 qts. of water per 40 lb. bag for both basecoat and finish coat. Apply basecoat 3/s" thick, allow to dry, then apply finish coat Vs" thick. Trowel finish may be smooth troweled, floated, stippled, or darbied after it has taken-up sufficiently. Ultra-White Finish--Where a light reflection of 70% or more is desired with machine application use Bestwall Lite Acous tic Ultra White Plaster for the finish coat only. 2. Special Plasters shall be applied in accordance with the directions of the Manufacturer. * #- # * 14 SGP 0003922 feKTWAII PRODUCT DATA SECTION 6 Bes I 1 1) PLASTERt Basecoat Plasters NEAT Unfibered Fibered (glass fiber or sisal liber) BRANDS BESTWALL BESTWALL USE Scratch coat on all backings except metal lath and monolithic con crete. Brown coat on ail backings COVERAGE (square yards per ton) (sanded 2:1) Gypsum Lath: 190-220 Metal Lath: 100-130 Gypsum Tile: 210 240 Clay Tile: 165-200 Plaster THICKNESS ; 'll 5/a" 'll V Scratch and brown coat on all backings except monolithic concrete. same as above same as above Extra Fibered (glass fiber or sisal fiber) BESTWALL Scratch coat on metal lath but may be used over all bases except monolithic concrete same as above same as above MILL MIXED Fibered, Unfibered Masonry Mix Wood Fibered Concrete Bond BESTWALL Lite-Mix (Available in 80 lb. bags only) Where lightness is desired, for faster, easier application. BESTWALL (Available in 100, 50 and 10 lb. bags) BESTWALL Without sand-scratch coat and brown coat on all backings except masonry. With sand-scratch coat on masonry and brown coat on all backings. Oouble back coat on monolithic concrete, or as scratch coat only. Gypsum Lath: 135-150 Metal Lath: 75-90 Gypsum Tile: 135-150 Clay Tile: 110-125 (without sand) Gypsum Lath: 100-120 Metal Lath: 50-65 Gypsum Tile: 85-100 Clay Tile: 65-85 Monolithic Concrete: 90-120 'll" %* 'll" 'h w Finishing Plasters PREPARED TROWEL FINISH PREPARED SAND FLOAT FINISH BESTWALL BESTWALL Where uniformity and extra hardness are desired. Can be dec orated when dry--no waiting period. For use over gypsum basecoat only. White or gray color. Same as prepared trowel finish except surface will be textured. White or gray colof. 350-400 250-275 'll" Maximum */a" Maximum WHITE GAUGING COMMON GAUGING BESTWALL Satin Spar BESTWALL Mixed with lime for use over gypsum basecoat. Great work ability: hard, smooth, white surface. Highest-grade rock. Avail able in quick set and slow set. Mixed with lime for use over gypsum basecoat. Selected qual ity rock, tight gray color. Gives hard, smooth surface. Avail able <n quick set and slow set. 1600 1600 Va'' Maximum Vg" Maximum KEENE'S CEMENT MOLOING AND CASTING BESTWALL BESTWALL Sunflower Mixed with lime. Gives strong, dense surface with high resistance to abrasion and water. Two sets: regular and last finish. Made from rock over 98% pure. Gives hard, strong molds and casts with low expansion. Mixed with water only for casts Mixed with lime and water for molds. (4:1 Mix) 550 Va" Maximum ACOUSTICAL PLASTER (White, Ultra White) BESTWALL Lite Acoustic Plaster (Available in 40 lb. bags) Applied by piaster machine or hand troweling over gypsum base coat, monolithic concrete or other surfaces which are firm, clean and free of efflorescence or water soluble substances. Sound coefficient .55 to 60. Natural white color. 350 to 400 'll LIME BESTWALL Smooth Finishing Lime (Normal Hydrated; Builder's Lime (Autoclaved) Mixed with gauging and molding plasters and Keene's cement to give plasticity, whiteness and bulk. Ohio Oolomite Lime furnished normal hydrated and autoclaved. (Available in 50 lb bags only ) t All plasters available in 100 lb. bags except where noted. Up to 750 LATH EOGE THICKNESS WIDTH WEIGHT LENGTH LBS./1000 FT.- FRAMING SPACING NAILS LBS./1000 FT.- NAIL SIZE NAIL SPACING BESTWALL LATH (Plain. Perforated, Insulating. Pmholath) BESTWALL Long length Lath Round Round or tongue and groove V edge V" Vi" /:" 16" ! 24- 48" up to 12' 1500 2000 2000 16" o c 24" o c 6 8 13 gauge 52 Not Applicable 5" o c. `/a" Maximum PANELS PER BUNOLE 6' 4 Shipped loose V only 16 1/5" width on Pacific coast, packed 5 panels per bundle SGP 0003923 15 A.I.A. Flit Ntf^VB-2 A.I.A. IFLE NO 218 2 SECTION 1 INTRODUCTION For over half a century, Bestwall gypsum building materials have been accepted as a standard of quality everywhere. This recognition is earned through continued creative research which provides such unique advantages as glass fiber reinforced gypsum plasters. The fiberglass content of Bestwall fibered plasters is an important factor to consider in specifying lath and plaster construction. Literally miles of glass fibers (391/, miles per bag of plaster) offer greater resilience and bonding properties that resolve many job difficulties and assure superior results. Armed with this exclusive development, the architect can select with confidence from a variety of lathing systems to meet exacting requirements. INDEX PI ASS FIRFR RFINFORCFMFNT BESTWALL GYPSUM LATH 1 ATHINr. SYS TF VIS BESTWALL gypsum PLASTERS MACHINE APPI ICATION 1 AtH ANn PI ASTFR CONSTRUCTION 1 ATH AND PI ASTFR SPECIFICATIONS PRODUCT nATA COMPANY DATA Section Page 12 __ 2_ _ __ 3 4 CO 5-8 4 9 11 5 12 14 6 15 16 2 Years of research and field use have demonstrated that glass fibered plaster is one of the most versatile plasters ever developed. This advanced improvement in fibered plasters controls the evenness of the scratch coat to produce good bond, thus assuring speedier and easier application. Textile glass filaments of uniform strength and length are dispersed in the mix. These individual filaments weigh only 1/150 to 1/200 as much as most mamla or sisal fibers, yet they are as strong as high strength steel of the same size. Speed--Glass filaments of uniform length and tremendous strength provide speedier and easier application. There is no balling up to groove the plaster and necessitate backtrack ing and smoothing. Quality Plastering--Provides better keying on metal or per forated gypsum lath. A better surface is made for reception of the finish coat. Economy--Spreads freely and provides high coverage with less droppings. With the glass fibers there is little build up of fibers and plaster on tools or mixer blades. Machine Application--Where fibered plaster is specified and machine application is used, glass fibered plaster effects greater construction economies and added design possibili ties. No clogging in the nozzle, no plugging m the ''cse FIBERGLASS DATA Content in Typical Bestwall Plasters NEAT (Fibered) Ton or Bag LITE-MIX (Fibered) Ton or Bag 790 mi. 39\/? mi. 650 mi. 26Th mi. Sq. yd. Vi" thick over Gypsum Lath ! j t 3.9 mi. (based on 2C0 yd. coverage per ton) 4 7 mi. (based on 1 JO yd. coverage per ton) Quality controlled high strength uniform fibers. `-"g. are well dispersed in the mix. Chart indicates ' "er=".>.ss content measured m miles. (Figs, jre approximate1 Further information and free consultation may be by writing directly to the Bestwall Gypsum C:1 uw consult nearest district office listed on the na-.k tins catalog Or SGP 0003925 iranyflH LATH SECTION 2 PLAIN GYPSUM LATH Descriptf^jh " ^ Bestwall Gypsum Lath consists of a core of gypsum rock sandwiched between two layers of special multi layer paper coverng. The exposed layer is soft and water absorbent, permitting water in the plaster to penetrate the surface. As plaster sets, crystals of gypsum form on the lath paper surface and attach themselves to the main body of the plaster to form a mechanical key. thus assuring maximum bond. The lath paper has water resistant inner plies which prevent the water in the plastefe from soaking through it and thussSWru*| mizes sagging of the lath and pfaster.3 Available with round edges. Uses The standard gypsum plaster base^Hr nail or staple or clip application tov_woed or steel framing. Size 16' x 48", )4" or '/)" thick. (16'/s' x 48" on West Coast only) I BESTWALL LONG-LENGTH LATH Description Manufactured in special lengths, up to 12', with round or tongue and groove edges. Has same core and paper as Plain Gypsum Lath. Uses Designed primarily for use as a plaster base for thin (2") solid partitions provid--i ing fire resistive ratings up to two hours.. Can also be used with furring over exter ior masonry walls as a plaster base! - Size 24" x 96", `/a" thick. *i BESTWALL PERFOLATH Description Use Plain lath with 34" diameter holes spaced Bestwall Perfolath's applications are iden 4" center to center, 48 holes per sheet. tical to Plain Lath. A wood stud partition Provides a double mechanical bond that faced with Perfolath and full thickness of increases fire protection. (See Technical plaster specified has a fire rating of Data. p. 9). Has same core and paper as hour (15 minutes longer than Plain Lath). Plain Gypsum Lath. Size ) 16" X 48", y,,- thick. BESTWALL INSULATING LATH Description Plain Lath with aluminum foil laminated on the back. Reflects 90% of radiant heat and acts as efficient vapor barrier. Use Designed primarily for application to ex terior walls and top floor ceilings. Must face a minimum air space of 3/i" to develop reflective insulation value. Size 16" x 48".. y*" or y?" thick. * ** > BESTWALL PINHOLATH Description Plain lath with the paper surface pinhole perforated into the gypsum core. Permits rapid absorption of water from plaster. Properly applied, full basecoat may be applied ^t one time, even when using machine application. Pinholes no larger than in diameter, spaced '/,' on centers. Uses Specially designed for machine-applied plasters. Fast and great water absorption speeds plaster application by holding plas ter in place during rodding and darbying. Sizes 16" x 48'. 16 x 96". '/a" thick. 1 3 SGP 0003926 SECTION 2 LATHING SYSTEMS Bestwall Olsen Gypsum Lath Clips permit fast erection of lath over wood or steel framing. Olsen clips attach lath permanently and securely to any framing, require less nailing and no wire-tying. Their strength and flexibility allow slight movement of framing without cracking plaster, compensating for expansion and con traction' stresses. Clips also provide resilience in wall, reducing sound transmission. Simplified, efficient design designates their usage in a variety of wall and ceiling assemblages. TYPICAL LATH SYSTEMS THIN SOLID PARTITION SYSTEM HIGH SOUND TRANSMISSION RESISTANCE (Bestwall Gypsum Lath Base) B-l Clips secure lath edges of internal and external angles formed by walls and ceilings. Oo not require nailing. SUSPENDED CEILING CONSTRUCTION (Bestwall Gypsum Lath Base) l Clips (Centerboard) are used in place of field clips to prevent ceiling lath from sagging. Steel-Tie Clips attach cross runners to mam runners m suspended ceiling systems F Clips are field clips '.hat attach gypsum lath to hot or cold rolled channels in ceiling construction. FS Clips mechanically suspend gypsum lath Irom hot or cold rolled channels and 3re used for starting first score of lath C Clips (Bridge) when used in suspended ceiling systems, are used as held .lips They attach straight edges of abutting gypsum lath I-- 4 ~T-->T- r i SGP 0003927 8E5TWALL GYPSUM PLASTER SECTION 3 GENERAL Bestwall Gypsum Company manufactures a complete line of highly efficient gypsum basecoat and high purity finish plasters. These plasters provide a wide latitude of selection to meet all architectural requirements. Each is designed for a specific function. Finish coat plasters provide the last plaster operation before decorating Various finishes are available, de pending on the type of texture or decorative effect desired. Basecoat plasters form that portion of the plaster con struction which is applied to masonry or lath bases and which help support and develop the properties of the finish coat. Basecoat plasters which require an aggregate are furnished with or without fibers. Bestwall basecoat plasters, both neat and mill mixed, are avail able glass fibered. DESCRIPTION The base of all gypsum plasters is gypsum in its calcined form. Gypsum can't burn and will not transfer heat sub stantially m excess of 212 F. until all its water of crystalli zation has been driven off in the form of steam (It takes approximately an hour for 1700 heat to pass through a 1" thickness of solid gypsum). When water is added to gypsum plaster on the |ob. the material re-crystalhzes (sets) revert ing to its original rock-like chemical form. FEATURES Fire Protection--8ecause of its water of crystallization, gyp sum with sand, wood fiber, vermiculite or perlite as aggre gate offers superior fire protection in hundreds of construe tions over wood or steel frame, in walls and partitions and in floor and ceiling construction and for beams and columns. (See fire ratings on p. 10). Durability--When applied in accordance with specifications. Bestwall Plasters provide uniformly strong, stable walls and ceilings. Bestwall sets evenly and uniformly to maximum hardness and strength. Under normal conditions of service, the plaster will last for the life of the building. Economy--Bestwall spreads freely, provides high coverage. The basecoat plasters bond securely to plaster bases, includmg gypsum lath, metal lath and masonry. The finish plasters, over basecoat plasters, provide hard, dense sur faces with a minimum of working. The finish wall can be maintained easily with normal care. "Plasticized"--Bestwall basecoat plasters. Neat and LiteMix. are manufactured by a special, scientifically controlled process to maintain plasticity and easy workability This process imparts plasticity and richness to the plaster and produces uniform high quality. Bestwall "Plasticized" Plaster makes possible fast and uniform application. Sound Insulation--Plaster adds mass to masonry units or specially designed lathing systems, providing increased sound reduction through these assemblies. Machine Application--Bestwall glass fibered piaster is rec ommended where fibered plaster is specified and maenme application is used Special ''machine application ' formulas are available. (See p. 8 and the Plastering Specifications for details). BRAND BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL BESTWALL PRODUCT NEAT BASE COAT PLASTER Unfibered, fibered. and Extra Fibered LITE MIX BASE COAT PLASTER Unfibered. Fibered (Glass Only) and Masonry Mu WOOD FIBERED PLASTER CONCRETE BONO PLASTER GAUGING PLASTER--vVhite (Satin Spar) or Local MOLDING PLASTER--White (Sunflower) or Local BUILDERS LIME (Autoclaved Finish Lime) SMOOTH FINISHING LIME (Normal Hydrated Finish Lime) SPEEDY MASON'S LIME (Autoclaved Mason's l.r-ie) MASON'S LIME (Normal Hydrated Mason s tnme) KEENE'S CEMENT PREPARE0 SANO FLOAT FINISH PLASTER PREPARED TROWEL FINISH PLASTER LITE ACOUSTIC PLASTER-White or Ultra Wh-te ASTM STANDARDS C 28-57 C 28 57 C 28 57 C 28-57 C 23 57 C 59-50 C 206 49 C 6 49 C 207 49 S C 207 49 N C 61 50 - FEDERAL SPEC. SS-P 402 (N) -- SS P 402 (W) SS P 402 (W) SS P 402 (G) SS l 351 (F) SS L 351 (F) SS L 351 (M) SS L 351 (M) SS C 161 - APPLIED UNDER ASA 42.1 ASA 42 1 ASA 42 1 ASA 42 1 ASA 42 1 ASA 42 1 ASA 42 1 ASA 42 1 ASA 42 1 a^a aj [ Asa 42 1 ' A 42 1 * a -i: i SGP 0003928 SECTION 3 GYPSUM PLASTERS BESTWALL BASECOAT PLASTERS .J* The basecoat is the most important element of a plastered wall. It not only rigidities but strengthens the lath base, helping to resist minor structural stresses; it provides the foundation for the finish coat. There are four distinct basecoat plasters, each designed for a specific function. Selection of the proper basecoat must be made with regard to the lath base to which it is applied and the desired finish coat which it must support. BESTWALL NEAT GYPSUM PLASTERS (Unfibered, Fibered and Extra-Fibered) Description: Basecoat plasters bond securely to any standard plaster base including gypsum lath, metal lath and masonry units. Requires addition of aggregate and water in field. Uses: 1. Fibered Plaster is recommended to provide greater wet adhesion and to minimize droppings with open type lath. 2. Unfibered Plaster is used for scratch coat on solid sur faces and for the brown (second) coat on any backing. Features: Durability--Applied according to specifications, Bestwall Basecoat Plasters provide uniformly strong, stable walls and ceilings. Machine Application--Special plasters, both fibered and un fibered, are available for use in machine application. BESTWALL LITE-MIX PLASTER Description: , A base coat plaster that is 50% lighter that) gypsum and sand plaster. Available either Fibered, Unffbeftd or Masonry Mix. Fibered Lite-Mix contains glass fibers to provide added strength and uniform thickness with less droppings. Requires addition of water only in field. Masonry Mix available for application on masonry bases. Uses: May be used for machine or trowel application to produce a superior basecoat. Features: Fire-Resistant--Perlite aggregate provides higher fire resist ance than sanded plasters. *, m FINISHING PLASTERS GAUGING PLASTERS Description: Specially ground high purity gypsum finishing plasters de signed to be blended with lime putty. They provide the base for final wall or ceiling decoration. Usually applied over a gypsum plaster basecoat and to a thickness of to ya". Available in "Slow Set" and "Quick Set". Features: White Coat Finish--Gauging sets to provide a hard, smooth white coat finish, over gypsum basecoat. Plasticity--Lime is used to furnish whiteness, plasticity and bulk. 1. Satin Spar Gauging Plasters are very white. 2. Bestwall Gauging Plasters made of local rock are rec ommended for use where pure white finish is not necessary. They furnish the same high quality surface as Satin Spar. MOLDING PLASTERS Description: Very white plasters made from selected gypsum rock of exceptionally high purity. Specially ground and processed to provide hard strong molds and casts. Excellent for run work and ornamental features. 1. Sunflower Molding Plasters are very white. 2. Bestwall Molding Plasters made of local rock are rec ommended for use where pure white work is not necessary. They furnish the same high quality surface as Sunflower. FINISHING LIMES Bestwall Smooth Finishing Lime (Normal Hydrated) Description: Hydrated Finishing Lime soaked to putty consistency (ap proximately L6 hours) blended in proper proportion with gypsum gauging plaster. Troweled to a smooth, hard finish over properly prepared gypsum basecoat. Must be blended with gypsum gauging plaster of proper proportion which provides initial set and strength, avoiding shrinkage cracks. Features: Whiteness, 8ulk and Plasticity are provided by the lime Fast, Easy Application with full flexibility and economy Bestwall Builder's Lime (Autoclaved) Description: A pressure hydrated (less than 8% unhydrated oxides) spe cial finishing lime. May be mixed by adding lime to water in mechanical mixer. Features: Requires no soaking to produce smooth, uniform, white, highly plastic putty. Normal plasticity achieved immediately. MASON'S LIME Bestwall Mason's Lime (Normal Hydrated) and Bestwall Speedy Lime (Autoclaved) available. BESTWALL KEENE'S CEMENT Description: A high strength, "dead burnt" white gypsum plaster Pro vides stronger, harder surface when substituted for gauging plaster in a lime-gauging mix. The lower the lime content, the harder the finish. Available Regular and Fast set Features: Resistance to Abrasion--provides high resistance to abra sion making it suitable for use in bathrooms, k.tchens. hospitals, etc. Low Water Absorption--because of high density, has low water absorption. Various Finishes--Keene's Cement when mixed with varying proportions of lime putty provides "standard hard" "me dium hard ' and "extra hard" finishes. BESTWALL PREPARED TROWEL FINISH Description: A pre-mixed gypsum finish coat plaster requiring addition of water only. Made from high grade gypsum rock of .xmte or local gray. Features: Strength--produces very hard surfaces, approxim u- y the strength of ordinary lime gauging finishes Easy Decoration--can be decorated as soon as or/ e ^ 6 SGP 0003929 i &E5TWALL GYPSUM PLASTERS SECTION 3 Bes Mixes smoothly--has no tendency to block the nozzle of the plaster gun. High Insulation Value--Lite-Mix provides greater insulation than sanded gypsum plaster. Fire-Resistant--Wood Fibered Plaster provides excellent fire rating up to 50% higher than sanded plaster. BESTWALL CONCRETE BOND GYPSUM PLASTER BESTWALl WOOD FIBERED GYPSUM PLASTER Description: Non-staining shredded wood fiber additive provides good working properties when used without aggregate. Description: A basecoat plaster designed to bond permanently with monolithic concrete to preserve a hard, durable surface. Re quires addition of water only in field. Uses: Uses: Intended for use without aggregate as scratch and brown coat. May be mixed with one part of sand for scratch coat over high suction masonry. Specially formulated to compensate for 2 problems: 1. where surface is too dense for ordinary plaster to form a mechanical key, and 2. where thermal expansion of concrete is lower than that of ordinary plasters. Features: Features: Economy--Can be applied quickly and easily. Bonding Strength--Concrete Bond adheres well to properly Strength--Bestwall Wood Fibered Gypsum Plaster has approximately 3 times greater compressive and tensile strength prepared concrete surfaces, columns and beams and on smooth cement block walls. V than sanded plaster: up to 2% times greater resistance to Low Cost--An economical basecoat plaster to provide for lateral impact and 50% greater surface hardness. application direct to concrete surfaces. i I I VV %!/ %: ..V .`i Ai, ; v>. - vj-.; v L' ;>f/ , :> `VV y. > / ., rn X Vi. V.-Av > :1 }>'Vv.i' vv'/` *;*V .:=.>* **>* A ' ., V--I-V'V.A' BESTWALL PREPARED SAND FLOAT FINISH Description: This pre mixed gypsum finish coat plaster has same quali ties and advantages as Prepared Trowel Finish. The only difference, this finish contains proper amount of uniformly graded white silica sand to produce hard textured surface. BESTWALL LITE ACOUSTIC PLASTER A mill mixed product. Bestwall Lite Acoustic Plaster is a versatile, highly light reflective, acoustical finishing material designed for machine application. Made of incombustible mineral materials, it provides exceptional bond to form a porous sound-absorbing surface. May be left with natural finish or spray painted according to directions after it's thoroughly dry. Use of Lite Acoustic is not limited to new construction. Permanent bond is assured when it is properly apphed to almost any surface (see Specifications). Existing ceilings can be covered effectively without removal or use of additional lath or backer board, providing the plaster is firm and the surface clean. Because various textures can be achieved m either White or Ultra White Lite Acoustic offers a wide scope of decora tive possibilities in residential, commercial or industrial con struction May also be applied by hand trowel iSee Spe cifications for details). Features: Fire Protection--Lite Acoustic will not burn or support com bustion. Economy--Provides wide field of low cost acoustical treat ment in both new work and remodeling. Versatility--Applied over standard gypsum basecoat plaster wall or monolothic concrete. Lite Acoustic Ultra White c.an be gun applied to provide coarse, medium coarse or fire textured finishes by adiustment of machine nozzle to meet various decorative requirements. Texture finish Thickness ,v 125 >5 Sound Absorption Coefficients FREQUENCIES 250 500 1000 2000 4000 Noise Reduction Coefficient Authority 27 52 69 78 38 __________ _________ Riverbank Light Reflection Coellicients White Ultra-White Spr iy f'Qwel A'-, : 1 : : 1 ,Ai ., SGP 0003930 7 SECTION 3 MACHINE APPLICATION Bestwall manufactures a full line of basecoat plasters, spe cially formulated for easy application through plastering machines. They are designed to pump at low hose pressure which insures steady and uniform flow from the nozzle without aggregate separation or plug ups and to have low water demand assuring hard, strong plastering. For scratch coat over metal lath, Bestwall Glass Fibered Plaster forms adequate keys with minimum blow through, thus assuring strong rigid plastering with minimum waste. These features provide the following advantages: Economy--Due to trouble-free application, more yards of plaster can be applied per man hour with less waste. Durability--When mixed and applied according to specifica tions. resultant plastering develops full strength and hard ness resulting in strong, durable walls and ceilings. Design Flexibility--Machine application lends itself to the flexibility of design for which gypsum plaster is noted, thus placing no limitation on use of this method of application. Machine application plasters are as follows: BESTWALL NEAT GYPSUM PLASTERS Unfibered plaster may be used for the scratch (first) coat on gypsum lath or masonry (solid surfaces) and for the brown (second) coat on any backing. Fibered plaster con tains a carefully measured amount of glass fiber to provide greater wet cohesion and minimize droppings behind open type lath. Fibered plaster is recommended for the scratch coat on perforated gypsum or metal lath and may be used for the brown coat on any backing. Extra-fibered plaster contains a greater proportion of glass fiber and is preferred in some areas for the scratch coat on metal lath. BESTWALL LITE MIX Unfibrtd or Fibarad (Glass only) Mixes smoothly, spreads easily and has no tendency to block the nozzle of the plaster gun. Lite-Mix produces a superior basecoat. It is also available in a Masonry Mix for application on masonry bases. Water only is added on the job. BESTWALL LITE ACOUSTIC wmioruitn whit* Can be applied over standard gypsum basecoat plaster or other clean, dry, firm bases such as concrete, metal decks, etc. Lite Acoustic (Ultra Whitel can be gun applied to pro vide ceilings of acoustical value as well as textured beauty and high light reflectivity. Can also be applied by hand, if desired. 8 1 SGP 0003931 BE5TWALL LATH AND PIASTER CONSTRUCTION SECTION 4 Bestwall Gypsum Plasters can be applied over gypsum or metal plaster bases on wood or steel framing. By varying the type of lath and the plaster mix and thickness, a full range of fire ratings may be obtained, from 45 minutes to four hours. TECHNICAL DATA CONSTRUCTION TYPE BASE PLASTERt MIX 1 part of Gypsum Plaster si00 pounds) to cu. ft aggregate | THICKNESS i face of Lath to | Face of Finished i Surface FIRE RATING PARTITIONS Description Thickness j 1 2" t 4" Wood Studs IS" on Center Solid Partitions Steel Ftame 5V 5V 5" sv 5V 5V S'/.' 5V 5V 2" 2" 2" r r 1v 2 <y 2- 4 U ' to 5 ' i 1' ' to 5 li" 5'. 'i" Plain Gvpsum lath *i" Plain Gypsum lath i '( ` Plain Gypsum lath ` Perlorated Gypsum '* ' Perforated Gypsum Metal lath Metal lath Metal Lath ' Metal lath ' j ` long length Gypsum lath ' j" Long length Gypsum lalh '" long length Gypsum lath 1 j ' long length Gypsum lath Metal lath Metal lath Metal lath Metal lath 'V Plain Gypsum lath ` Perforated Gypsum lath i Metal lath CEILINGS (2 Miies---Scratch and Brown) (1 Mia--Scratch Double-Up) -- ! Gypsum Sand 1 2 Gypsum Sand 1:2. 12 1 \ ' I/,-' > Gypsum Wood Fiber i Gypsum Perlite l 2 Vz t ! Gypsum Sand \ 2. 1 3 'i * Gypsum Wood Fiber Gvpsum Perlite 1 2l 1-', " Gypsum Vermicuhte l 2, 1 3ti i Gvpsum Sand 11 12 Gypsum Perlite l 2` : , Gypsum Perl.te l 2. 1 3f , Gypsum Vermicul'te 1.2. 1 3t - Gvosum Sand 1.2. 1.2 1 , Gvpsum Perlite l 2 /* f i Gvpsum Perlite 1 2. 3 f Gypsum Vermiculite 1.2, 31 1 l'/, " IV IV l v, 2" IV 2V 2V | Gvpsum Perlite l .21.i1 I Gypsum Sand 12. 12 j Gvpsum Sand 12. 13 I1 1," | '4 l Hour 45 Minutes l Hour 1 Hour 1 \'t Hours 1 Hour 2 Hours l Hour 1 Hour 1 Hour l '/* Hours 2 Hours 2 Hours 1 Hour l Hour 2 Hours 2 Hours 1 Hour l Hour l Hour and floor ; i : , { Fiji ring Channels 1 16' oc ' 16" oc ' 16" oc 1 ' Bestwall P!am Gvpsum lath plus 1" Hex Wire Mesh Perlorated G.psum Ijth V Pe<`oraled Gvosum lain Plus Metal lath Str p `i" Perforated Gypsum lath Metal lath Metal lath Perforated Gypsum lath Clips) V Perforated Gypsum lath O psi 'a ` Perforated Gypsum lath Clips) i Gypsum Sand l 2 Gypsum Sand 1 2 Gypsum Sand 12 Gvpsum perhte l 2''* f Gypsum-Sand 1 2. 1 3 , Gypsum Perlite 12, l 3 t Gypsum Perl'te 1 2! -) Gvpsum Vermicul'te l 2L*f 1 Gypsum Perlite l 2, l.3t ' i , < ' i % x`i ' 'a * V' r | l Hour \ 45 Minutes l Hour l hour l Hour 1 Hours 1 Hour 1 Hour 1 -.i Hours Steel loists 2" Floor Slab) 1 ________________________ I 'Iteel Floors 2 lo 2' ; Concrete F'oor with Suspended Ceil-^gs 16" oc 12 ` oc l 6 ' QC 1 2" oc 12" oc i V Perforated Gypsum l ath Cl ps) 5g" Perforated 'aypsum lath Cl.ps) V Perforated Gypsum lath Plus f Mesh !'i ' (Clips) Plus 1" Mesh Metal lath j Metal lath l Metal lath Gyosum Perlite 1 21 ; ) Gvpsum Perlite 1.2. l 3) Gypsum Perlite l 25 2 \ Gypsum Perlite l 2. l.Jt Gvpsum-Sand 1:2. 1 3 Gypsum Perlite 1 2. l 2t Gypsum Vermicuhte 1 2. ! V Perforated Gypsum Lath P'us 1 Ci'OS and Wire Reinforcing i Metal lath j Metal lath J_________________________________________ . Gypsum Perlite 1 2' ; f Gypsum Perhte l 2. 1 3t Gvpsum Wood Fiber 3t !.V V 1 3 Hours v 3 Hours r ! 4 Hours i* 2 Hours V 3 Hours V," 4 Hours 1" on Beam) i 4 Hours 4 Hours COLUMNS Columns Steel) i j i_________________________ ___________________ V Per`oraled Gvpsum lnh V Perforated Gypsum l ith 1 g Perlorated Gypsum i ith Perforated Gypsum 1 ith 2 layers ' > PUm `ivusuin l ith Metal Lath Metal Lath Gypsum Sand 1 .25 a ! Gypsum Sand 1 2. 1 3 j Gypsum Perhte l 21 > t 1 Gvnsum Perhte 1 2. 1 31 ) Grp .uin Perlite 1 2 1 3f i Gypsum Sind 1 2. 1 3 Gypsum Perlite l 2. l )t 1 r 1 !* ` r i v` P; ' IV | 2 Hours j 4 Hours 1 l Hour l 4 Hours i f---- WEIGHT NRC LBS. PER (AVERAGE) SQ. FT. DECIBELS 15 14 7 -- _____ _____ 18 1 -- -- -- 16 5 -- 10 9 -- 13 1 14 -- IS to 21 35 lo 45 35 lo 45 -- ______ 39 _____ -- -- 38 -- 37 -- 38 33 -- -- 30 o !1 i __ 12 5 __ -- 1' 5 ____ -- __ 40 __ -- 32 lo 34 ____ -- _____ ____ _____ 1 ____ ____ ____ _____ i ____ i _____ i ____ > ____ -- 1 ____ rzz-- , i ____ ____ i~ i ! _ 'T " ____ __ ____ ____ ___ ____ ____ ____ ____ -- 1 NOTE; This table 'S a summary only based on tests at Underwriters I itiouinnes National Bureau of Standards and/or Ohio State University, sponsored b* "'e tion Metal Lath Association P<Me Institute. VermicuMe tu-Mnto m -iiimrs The tire rahng weight and sound characteristics are based jn \ "Ki d^Uiis as cubGsPed bv the Associations and also by the Nat.nnal IGieau nt standards in various bM$ reports, by National Board of Tire Ur.;*-* Ratings jmj others Moie complete l.stings and JelaGs are available from many sources' t Sand t'oat or other finish eicept smooth trowel shall be used over neiMe or vernncjhte basecoat wnere ratio exceeds 2 cu ft of aggregate '. * Smooth trowel finish shall not be used Assoca n _ -.jec t<: 'neir t. of 9 SGP 0003932 SECTION 4 LATH AND PLASTER CONSTRUCTION GYPSUM LATH AND PLASTER FIREPROOFING THIN SOLID PARTITIONS A 2" Solid Partition is a non load bearing (non supporting) unit composed of Bestwall Long-Length Gypsum lath threecoated out on both sides to a total 2~ thickness. No stud ding is required. The lath is inserted into floor and ceiling runners and is temporarily braced during the plastering operation. 2" Solid Partitions make economical floor area dividers and render more usable space than hollow or tile partitions. Bestwall Olsen Gypsum Lath Clips provide easier, faster erection and eliminate wire-tying. Tested under A.S.T.M. Standards, 2" Solid Partitions of lath and sanded plaster qualify for 1-hour fire rating. For higher fire ratings, consult Technical Data--Lath and Plaster Construction on the pre vious page. HOLLOW STEEL STUD PARTITIONS Hollow Steel Stud Partitions consist of gypsum lath and plaster over steel studding. These partitions may be load bearing or non-load bearing depending upon studding used. Studs are available in widths from 2>/2" to 6'. Bestwall Gyp sum Lath is secured to the studs by use of transverse clips or other special clips and techniques. These partitions are particularly adaptable where pipes and utilites are to be concealed. Weight of Hollow Steel Stud Partitions is determined in pounds per square foot and will range from 10 lbs. to 15 lbs. depending upon aggregate used and thickness. A 1-hour fire rating is obtained when Bestwall Perfolath and a >A" plaster is used. Mix is 1 part plaster to 2 parts lightweight aggregate or sand. 10 St. m. * mmn LATH AND PLASTER CONSTRUCTION SECTION 4 I GYPSUM LATHfWNO PLASTER FIREPROOFING BEAM AND COLUMN FIREPROOFING Fireproofing of the beams and columns is accomplished by abutting ya' Bestwall Perfolath around the perimeter of the beam or column and plastering to thickness required for desired fire resistance rating. The Perfolath is held by tying double strands of the wire around the lath and spaced 16' o.c. Cornerbeads applied by staples or tie wire provide ground for proper thickness as well as straight true corners. Sanded plaster is used for fire ratings up to three hours. Lightweight aggregates provide fire ratings up to 4 hours. A 4 hour column rating requires two layers of >/2' thick gypsum lath. CEILING FIREPROOFING 1 Lath and plaster ceilings when directly-igftoched to or sus- ._ pended from structural members provide fir& protection that eliminates concrete or tile encasment of steel framings. Dead weight loads are reduced by as much as 9&%. This m turn reduces structural steel requirement to a minimum of 15%. Thicknesses of lath and plaster are baserf^1 required fire ratings. Sand aggregate provides up to 2 hour fihe rating while up to 4 hour fire ratings may be obtained with the use of vermiculite or perlite aggregates. furring channels are directly attached to the bottom of the structural members or tied to main fanners in sus pended systems. Bestwall %' Perfolath is attached to fur ring with transverse clips and plastered out to required thickness. .. . " For three and four hour fire resistive ratings, 12 gauge wire is laid diagonally across the plastering side of the lath and tied to each clip for additional support. Plaster mix shall be 1 part gypsum to 2 parts aggregate for scratch coat and 1:3 for brown coat. For double up work, the pro > portion can be changed to 1:2'/, for entire basecoat. II  SECTION 5 SPECIFICATIONS SPECIFICATIONS FOR 1. MATERIALS A. Gypsum Lath shall conform to the current Standard Specifications for Gypsum Lath, ASTM Designation: C37. Gypsum lath shall be one of the following types: Plain, Perforated or Insulating. All gypsum lath shall be as manufactured by Bestwall Gyp sum Company and shall conform to the following dimen sional requirements: Thickness 3/a~ or y2" Width 16" (a) or 24" Length 48" (b) (a) 16',i" wide lath is available in Pacific Coast Markets. (b) Long-length lath ' thick is available for special systems such as solid gypsum lath and plaster partitions and furred walls. B. Gypsum Lath Clips shall be Bestwall Olsen Gypsum Lath furnished by Bestwall Gypsum Company. C. Other Metal Accessories such as corner beads, base screeds, concealed picture molds, etc., shall be not lighter than No. 26 U.S. gage steel, zinc coated, with perforated or expanded flanges or clips shaped so as to permit complete embedment in the plaster. D. Channels shall be hot rolled or cold rolled steel, free of rust, with required weight per thousand lineal feet. 2. APPLICATION OF GYPSUM LATH A. Except where noted below Bestwall Gypsum Lath shall be securely nailed to wood supports spaced not to exceed 16" on center (24" on center for 1 ?" lath) with 13 gage. l'.'a" long (l'i" long for ij" lath), 19/64' flat head, blued nails approximately 5" o.c. The nails shall be driven with the underside of the head flush with face of the lath and shall not be closer than Vs" from edges or ends. There shall be not less than four nails per lath per support with 16" wide lath. Where 24' wide lath is applied, there shall be at least 5 nails per lath per support, approximately 5' on center. B. Where 3/a" gypsum lath is used for certain fire-resistive rafed construction, five 13 gage, 1`/a " long, 3 s' flat head, blued nails per lath per support for 16' wide lath may be required. INTERIOR LATHING C. %'' Bestwall Gypsum Lath may be applied -with staples to wood nailing members by means of a pneumatic tool Staples shall be not less than 16 gage flattened galvanized wire. '/,t" flat crown, divergent point, not less than long. Staples shall be driven with the crown parallel to tbe long dimension of the nailing member, using not 'ess Win 4 staples per 16 width of lath per nailing member and not more than 5" o c.. m such a manner that the crown bears tightly against the lath but does not cut into the face paper. The legs of the staples shall not be closer than V, ' from the ends and edges of the lath. D. Bestwall Gypsum Lath shall be applied with its face side out and with the long dimension at right angles to the framing members. End joints shall be made to fall on dif ferent supports in alternate courses, or the lath shall be applied so that end |oints are made continuously on one support. In the latter case, the continuous joints shall be covered with 3" wide strips of metal lath and the long or edge joints shall be offset or staggered. In all cases, the lath shall be butted together. E. Corner bead shall be used over lath to protect all xter nal vertical corners and to establish grounds, and shall he attached securely in such a manner as to assure proper alignment during application of plaster. F. Cornerite shall be provided at all interior angles and shall be nailed lightly or stapled to the lath, not to the framing members. G. Where Bestwall Olsen Gypsum Lath Clips are used, the erection of lath shall be in accordance with the direrto-s and details shown in the various constructions 3. METAL LATH AND METAL FURRING Shall be in accordance wth ASA Standard Specifications for Interior Lathing and Furring, No. A42 4 (latest current ver sion). 4. WORKMANSHIP All metal construction and lathing shall be erect i u c finished plaster surfaces may be true to line, am' re plumb, square, curved or as otherwise required f ..: excessive thickness of plaster. SPECIFICATIONS FOR GYPSUM PLASTERING The following specifications covering machine mixed neat basecoat plasters with a i>me putty -white coat finish are ipcl.r m e to a majority of plaster -work. As indicated in Section 2A (Materials) Bestwail offers a full me of plaster materia s . i work well, applied under the ASA 42 Standard Specifications for Interior Plastering. For more information write the Bestwall Gypsum Co. 1. GENERAL PROVISIONS The work includes all labor, materials, services, equipment, and scaffolding required to complete the plastering of the project in accordance with the drawings and specifications. (See interior lathing specifications.) 2. MATERIALS A. Plastering Materials The plaster materials shall be selected from the following categories and brands as manufactured by Bestwall Gypsum Company and conforming to the current ASTM specifications as noted: BESTWALL Gypsum Plaster C28 BESTWALL Lite Mix C23 BESTWALL Wood Fibered P'aster C28 BESTWALL Concrete Bond Plaster C28 BESTWALL Prepared Trowel Finish -- BESTWALL Prepared Sand Float Finish -- BESTWALL Satin Spar White Gauging Plaster C28 BESTWALL Common Gauging Plaster C28 BESTWALL Sunflower Molding and Casting Plaster C59 BESTWALL Keene's Cement C61 --F* BESTWALL Lite Acoustic Plaster -- BESTWALL Builder's Lime (Autoclaved Finish) C2C6 Type S BESTWALL Smooth Finishing Lime (Normal Hydrated) C6 Type N B. Aggregates (for use with gypsum plaster) Su'd P-or Vermiculite shall conform to ASTM Specificat-on r.3S S'T for use in basecoat plaster. For plastering, the .vmu i'e weight per cu ft. snail be for sand, 100 IDs. for Per'.te m.l Vermiculite. 7 to 11 lbs. Fine Sand having rounded particles uniform m size 'J quently called "quicksand"), fine Perlite or fme Verm :e shall not be used. C. Water shall be clean, fresh, potable and he u - amounts of mineral and organic substances as ' " -'t the set of the plaster. D. Materials, Delivery of, and Protection All m .' > materials 'hall ne delivered in the original ;.u:xi,:-s tamers, or bundles bearing the name of the " i of the brand. Plaster and all cenientious materials shall be k-i t ", ready to be used, they shall be kept off the cover, and away from sweating walls and ctl'm 1 i ; m ' faces. Metal goods shall be protected against rusting 3. BASE COAT PROPORTION Bestwall Gypsum Plaster shall be mixed wtm sm' 12 SGP 0003935 ! i tI I> BE5TWALL SPECIFICATIONS SECTION 5 or vermiculite in tlie proportion of 100 lbs of plaster to not more than: COAT WORK ble up Method) Sand Perlite or Vermiculite cubic feet THREE COAT WORK Sand Perlite or Vermiculite Lubic feet Gypsum Lath z'/iiD Fust ' Scratch) coat over lath First iScratch) coat nve. masonry 2' 3` Masonry >cept monolithic concrete) 3 Second coat over lath base Second coat over masonry base 3 'hi 1 rtfu of The proportions specified jbove the proportions mjy be 100 lbs of 8est*aH Gypsum Plaster to not more than 2 > cu ft of sand perlite or vermiculite provided this proportioning is used for both scratch and brown coats V'Under smooth trowel finish, perlite or vermicuhte limit 2 cu. ft 0ver high suction base, sand may be 4 cu ft. 4. MECHANICAL MIXING Material that has partially set shall not be retempered or used. Frozen, caked or lumpy material shall not be used. The mixer shall be cleaned of all set or hardened material before materials for a new batch are loaded. Each batch shall be mixed separately. Materials shall be added while mixer is m continuous operation. Put in the approximate amount of water; if sand is used add approximately half the amount of aggregate (if perlite or vermicuhte is used add all the aggregate), add all the plaster; add the remainder of the sand aggregate: mix to the proper consistency, adding water if necessary: and dump the entire batch and use. Note: The mixer should be flushed with water when used intermittently 5. LIME PUTTY A. Bestwall Smooth Finish Lime shall be box soaked or machine mixed with 6 to 61'. gal. of water for each 50 lb. bag and allowed to soak overnight. B. Bestwall Builders Lime shall be mixed with approxi mately 6'^ gal of water per 50 lb. bag It may be machine mixed and used immediately or soaked and used the next day 6. FINISH COAT PROPORTIONS A. Smooth Trowel Finish NOTE: For smooth trowel finish /> to 1 cu. ft. of fine sand or perlite shall be added for each 100 lbs. of gypsum (Gauging or Keene's Cement). 1. Gypsum Lime Putty Trowel Finish shall be mixed in the proportions of 1 part of gauging plaster (calcined gypsum) to not more than 3 parts of lime putty by volume. 2. Keene's Cement Lime Putty Finish may be standard hard, medium hard, or extra hard finish. When mixed mechani oily the water shall be put in the mixer first; then the lime (dry or putty): the sand, if used; and finally the Keene's Cement. Standard Hard Finish shall be mixed in the proportions of 100 ibs of Keene's Cement to not more than 100 lbs. of dry hydrated lime. B. Sand Float Finish 1. Gypsum Sand Float Finish shall be mixed in the ratio of 100 Ibs of gypsum plaster (unfibered) to not more than 200 Ibs of sand, 2. Keene's Cement Lime Putty Sand Float Finish shall be mixed in the range of 2l/4 to 3 parts of sand to 1 p3it of a mixture of Lime and Keene's Cement by weight with 'a to 11 parts of Lime to 1 part of Keene's Cement by weight. The specified range is equivalent to the following: from 75 lbs Lime to 100 Ibs. Keene's Cement to 400 to 525 lbs. sand to 150 lbs. lime to 100 lbs. Keene's to 560 to 700 lbs. sand. C. Bestwall Lite Acoustic Plaster shall be mixed with water to the proper consistency. 7. THICKNESS OF BASECOAT PLASTER Plaster shall be of the following thicknesses measured from the face of plaster base to finished plaster surfaces. Wood or metal grounds or plaster screeds shall be installed to assure such thicknesses: Thickness of Plaster Including Finish Coat, m i Gypsum Lath ! Metal Lath1, Wire Lath and 'A min. 'Wire Fabric Masonry and Concrete Walls Monolithic Concrete Ceilings Vs mm. Vs min. >/a mm. Va max. A. Plaster thickness when measured from the back plane of metal lath, exclusive of ribs, shall be Vi" minimum. B. If monolithic concrete ceiling surfaces require more than J/8 ' of plaster to produce required lines or surfaces, metal lath or wire lath bonding for the plaster shall be attached to the concrete before application of plaster. Where the concrete ceiling surfaces are such as to require the appli cation of an excessive thickness of plaster to produce required lines or surfaces, lath shall be applied over furring secured to the concrete. Wood Grounds shall be furnished and installed by others. Metal Grounds shall be furnished and installed by the (plastering) (lathing) contractor. Plaster Screeds shall be installed by the plastering con tractor. 8. PREPARATIONS FOR PLASTERING A. Temperature and Ventilation: When the prevailing outdoor temperature at the building site is less than 55 F a uniform temperature of not less than 55 F shall be continuously maintained in the building for a period of not 'ess than one week prior to the application of plaster while the plastering is being done, and after the plaster is dry. The neat snail be well distributed in all areas, and deflection or protective screens shall be used to prevent concentrated or uneven heat on plaster areas near the heat source Products of combustion shall be vented to the outside. Ventilation shall be provided to properly dry the plaster during and subsequent to its application In glazed build ings this shall be accomplished by keeping windows open approximately 2" top and bottom (or side pivoted windows approximately 4") to provide air ciroulabon. and by use of temporary circulators or the air conditioning system m enclosed areas or buildings lacking openings for natural ventilation. If glazed sash are not in place and the building is subiected to hot, dry winds or temperature differentials from day to night of 20 F. or more, openings shall De screened w th cheesecloth or similar materials. B. Masonry Surfaces on which suction must be reduced shall be properly wet down immediately before the plaster is applied. Because bituminous compounds do not provide ideal bases for plaster, the application of plaster to masonry or concrete which has been coated w.tn sumi compounds is forbidden. C. Monolithic Concrete Surfaces shall be . .mined of a'l dust, loose particles, and other foreign m itter Ljitance and efflorescence shall be removed by w.isi-.rg first w.th 10"',i solution of commercial hydrochloric i-. d (mur.at'C acid) and water and then with clem ,v itr :i remove j'i traces of acid. Grease and oil shall he , n-p.'.ei/ removed (Note 9b)- Concrete surfaces shall have sufficient me. ---m to pro-, oe proper bond If necessary, the surf i.m , ' - evemy wet 13 SGP 0003936 SECTION 5 SPECIFICATIONS ted, but not saturated, to provide proper suction. If surfaces are not rough, they shall be hacked or bush-hammered or a dashcoat of Portland-Cement grout, composed of L part of cement to 1 i/2 parts of fine sand mixed to a mush con sistency, shall be applied. The Portland-Cement grout shall be forcibly dashed on the concrete surface, using a stiff fiber brush, with a whipping motion. This coat shall be kept damp for at least two days immediately following its application and then allowed to dry. Before application of plaster, the surface shall be evenly dampened if necessary to provide proper suction. D. Metal Grounds and other accessories, such as corner beads, screeds, picture molds, etc., shall be carefully examined to see that they are straight, curved, plumb, level, square, or true to the acquired angles, as the case may require, before the plaster is applied. E. Surfaces shall be carefully examined before the plaster is applied thereto, and the proper authorities notified of any and all unsatisfactory conditions. Application of the plaster then shall not proceed until such unsatisfactory con ditions have been satisfactorily remedied or adjusted. D. 2" Solid Gypsum Lath and Plaster Partitions shall be scratched in on both sides with 3/,,' fast setting plaster (maximum 3 hrs.) practically simultaneously. The side away from the temporary bracing shall be browned after both scratch coats have set and partially dried. After this brown coat has set firmly, remove the braces and brown the other side leaving >/,*" for finish coat to bring wall to full 2' thickness. 10. APPLICATION OF FINISHES The finish coat shall be applied to a partially dry base coat or to a thoroughly dry base coat which has been evenly wetted by brushing or spraying. The use of excessive water shall be avoided in the application of all types of finish coat plastering. NOTE: Fine sand or perlite shall be used in smooth trowel finishes. Over gypsum or metal lath bases where light weight aggregate is used and the aggregate content in the basecoat exceeds 2 cu. ft. per 100 lbs. of gypsum, a sand float, acoustical or other finish shall be used. Smooth Trowel Fin ishes shall not be used in this place. 9. APPLICATIONS OF BASE COAT A. Two-Coat Work--Base (first) coat shall be applied with sufficient material and pressure to form good bond on gypsum lath or masonry as the case may be, and to cover well. Then, before this scratch coat has set, and without raking its surface, material of the same proportions shall be doubled back to bring the plaster out to grounds struck to a true surface wtih rod and darby, without application of water and cross raked or scratched to provide a mechanical key for reception of the finish (second) coat. Slow-setting plaster shall be accelerated to provide a set (mixed mate rial) of less than 4 hrs. B. Three-Coat Work--Scratch (first) coat shall be applied with sufficient material and pressure to form good full keys on metal lath, wire lath, or wire fabric, or good bond on gypsum lath or masonry, as the case may be, and to cover well and then be scratched to a rough surface. Slow-setting plaster shall be accelerated to provide a set (mixed mate rial) of less than 4 hrs. Brown (2nd) coat shall be applied after the scratch (1st) coat has set firm and hard, brought out to grounds, straightened to a true surface with rod and darby, without application of water and cross raked or scratched to provide a mechanical key for reception of the finish (3rd) coat. To insure full plaster thickness, plaster screeds should be ap plied to the scratch coat prior to the application of the brown coat. C. Plastering on Monolithic Concrete-Surfaces of walls and columns shall have a scratch coat of bond plaster, followed by a brown coat of gypsum plaster (in the proportions of 100 lb. of Bestwall Gypsum Plaster to not more than 3 cj. ft. of sand or perlite) troweled into the scratch coat before it has set. The brown coat shall be brought out to grounds, using a double-back application if required, straightened to a true surface with rod and darby, with application of water and cross raked or scratched to provide a mechanical key for reception of the finish coat. Surfaces of ceilings shall have a coat of bond plaster, scratched in thoroughly, doubled back, and filled to a true, even surface and left rough (maximum thickness '/s'), to receive the finish coat. A. Trowel Finishes--Trowel Finishes (smooth) shall be ap plied over the base coat scratched in thoroughly, laid on well, doubled back and filled out to a true, even surface. The gen eral thickness shall be T,,' to Vs". The finish shall be allowed to draw a few minutes and then it shall be well-trowelled with water to a smooth finish, free from cat faces and other blemishes or irregularities. B. Float Finishes--Float finishes shall be applied over the base coat, scratched in thoroughly, laid on with a trowel to an even surface, and then floated (with wood, carpet, cork, rubber or other type floats, depending on the texture desired) to a true, even surface free from slick spots or other blemishes. C. Acoustical Plaster and Other Special Plasters: 1. Bestwall Lite Acoustic (White) Plaster shall be mixed with clean water only for machine or trowel application over gyp sum basecoat plaster, monolithic concrete and other sur faces which are firm, clean and free of efflorescence or water soluble substances. Gypsum basecoats should be half dry to dry. Concrete should be dry. Spray--For first coat use 55 to 60 qts. of water per 40 lb. bag. Apply 3/a" thick. Level with darby and allow to dry before applying finish coat. For finish coat use 5 to 10 addi tional qts. of water per bag depending upon texture desired. When applied over low suction bases such as dense con crete, metal, etc., the material should be applied in three applications, the first application furnishing the suction for subsequent coats. Any large fissures in the first coat should be filled and leveled before applying the finish coat. Hand--Use 50 to 60 qts. of water per 40 lb. bag for both basecoat and finish coat. Apply basecoat 34" thick, allow to dry, then apply finish coat Vs" thick. Trowel finish may be smooth troweled, floated, stippled, or darbied after it has taken-up sufficiently. Ultra-White Finish--Where a light reflection of 700 j or more is desired with machine application use Bestwall Lite Acous tic Ultra White Plaster for the finish coat only. 2. Special Plasters shall be applied in accordance th the directions of the Manufacturer. 14 SGP 0003937 I rI i) BESTWALL PRODUCT DATA SECTION 6 ' PLASTERt Basecoat Plasters NEAT Untibered Fibered (glass fiber or sisal fiber) BRANDS BESTWALL BESTWALL USE Scratch coat on all backings except metal lath and monolithic con crete. Brown coat on all backings. COVERAGE (square yards per ton) (sanded 2.1) Gypsum Lath: 190-220 Metal Lath: 100-UO Gypsum Tile: 210 240 Clay Tile: 165-200 Plaster THICKNESS : Vi" %" '/2" V." Scratch and brown coat on all backings except monolithic concrete. same as above same as above Extra Fibered (glass fiber or sisal fiber) BESTWALL Scratch coat on metal lath but may be used over all bases except monolithic concrete. same as above same as above MILL MIXED fibered, Unfibered Masonry Mix BESTWALL Lite-Mii (Available in 80 lb. bags only) Where lightness is desired, lor faster, easier application. Gypsum Lath: 135-150 Metal Lath: 75-90 Gypsum Tile: 135-150 Clay Tile: 110-125 Vi' 5/" Vi" %' Wood Fibered Concrete Bond BESTWALL (Available in 100, 50 and 10 lb. bags) BESTWALL Without sand-scratch coat and brown coat on all backings except masonry. With sand-scratch coat on masonry and brown coat on all backings. Double back coat on monolithic concrete, or as scratch coat only (without sand) Gypsum Lath: 100-120 Metal Lath: 50 65 Gypsum Tile: 85-100 Clay Tile: 65-85 Monolithic Concrete: 90-120 'A' 5/s* V2" V" '/j-y," Finishing Plasters PREPARED TROWEL FINISH BESTWALL Where uniformity and extra hardness are desired Can be dec orated when dry--no waiting period. For use over gypsum basecoat only. White or gray color 350-400 `/s' Maximum PREPARED SAND FLOAT FINISH WHITE GAUGING COMMON GAUGING KEENE'S CEMENT BESTWALL BESTWALL Satin Spar BESTWALL BESTWALL Same as prepared trowel finish except surface will be textured. White or gray color. Mixed with lime tor use over gypsum basecoat. Great work ability: hard, smooth, white surface. Highest-grade rock. Avail able m quick set and slow set. Mixed with time lor use over gypsum basecoat. Selected qual ity rock, light gray color Gives hard, smooth surface Avail able >n quick set and slow set. Mixed with lime. Gives strong, dense surface with high resistance to abrasion and water. Two sets: regular and last finish. 250-275 1600 1600 (4:1 Mix) 550 l/e" Maximum !,V Maximum Vj" Maximum '/a' Maximum MOLDING AND CASTING ACOUSTICAL PLASTER (White, Ultra White) BESTWALL Sunflower BESTWALL Lite Acoustic Plaster (Available in 40 lb. bags) Made from rock over 98% pure. Gives hard, strong molds and casts with tow expansion. Mixed with water only for casts. Mixed with lime and water for molds. Applied by piaster machine or hand troweling over gypsum base coat, monolithic concrete or other surfaces which are firm, dean and free of efflorescence or water soluble substances. Sound coefficient .55 to 60. Natural white color. 350 to 400 v2" LIME BESTWALL Smooth Finishing Lime (Normal Hydrated Builder's Lime (Autoclaved) Mixed with gauging and molding plasters and Keene's cement to give plasticity, whiteness and bulk Ohio Dolomite Lime furnished normal hydrated and autoclaved. (Available m 50 lb. bags only ) t jesters available m 100 lb. Dags except where noted LATH EDGE THICKNESS WIOTH LENGTH WEIGHT IBS./IOOO FT.- FRAMING SPACING NAILS LBS./1000 FT.- Up to 750 NAIL SIZE NAIL SPACING BESTWALL LATH (Plain. Perforated, Insulating. Pmholalh) Vi * Vi" BESTWALL l ong length Lath Round or tongue and groove V edge !,, up to U* ' only 16 1/5 ' width on Pacific coast, packed 5 panels per bundle 1500 2000 2000 16" o c. 24" o c 6 3 13 gauge 52 Not Applicable 5" o c '.V Maximum 1 PANELS PER t BUNDLE 6" 4 ! Shipped i loose i 15 SGP 0003938 COMPANY Bestwall, the nation's third largest gypsum company, has served builder, architect, contractor and property owner with a full line of quality gypsum building materials and construction components for more than 50 years. FACILITIES Strategically located plants across the nation utilize the most modern equipment and production techniques. In addition, quality control and research laboratories continuously check and control the performance of the finished product to meet highest quality standards. An efficient distribution network makes Bestwall a prompt and reliable source of supply. SERVICES Offices in principal cities are staffed by qualified sales representatives equipped to provide further information and assistance and to insure that your selection of materials is complete and applicable. &BTWALL 8 uC1 s BESTWALL GYPSUM COMPANY ARDMORE, PENNSYLVANIA SGP 0003939 K \ K . \ V \-l 'W * SGP 0003940 mp*** !lW HflWIU the original and only glass fiber reinforced GYPSUM WALLBOARD GYPSUM WALLBOARD PRODUCTS Regular Gypsum Wallboard jjSsSI DESCRIPTION Bestwall Gypsurn Wallboard consists of a glass fiber reinforced core of gypsum rock enclosed between two layers of tough paper. The durable cream face paper is folded around the long edges to reinforce and pro tect the core. The ends are square cut and smooth finished. A strong gray paper is on the back side. The fiberglass content of Bestwall gypsum board products is an important and unique factor to consider in specifying drywall construction. Literally miles of glass fiber filaments add greater resilience, strength and handling ease. FEATURES Glass Fiber Reinforced--Textile glass filaments of uniform strength and length are dispersed in the gyp sum core (for example, up to 1.2 miles in every sq. ft. of 3/a' regular board; up to 6.3 miles in every sq. ft. of %' Firestop). Fireproof--The solid core of gypsum wallboard is incombustible. Gypsum will not burn and will not transfer heat in excess of 212' F. until all its water of crystallization has been driven off in the form of steam. Strength--Readily resists flexural stresses and will not crack or sag when applied to ceilings in the spe cified manner. Flexible enough to conform to mod erately curved surfaces. Joint Treatment--Bestwall Wallboard is finished with tapered edges to accommodate the Bestwall Joint Systems or square edges for exposed joints. Fast Decoration--Gypsum Wallboard, a "dry'' mate rial, allows painting or other decoration shortly after application of Joint Treatment. Economy--Large, lightweight panels go up fast. They may be "scored and snapped" or sawn to size. Drywall--Plant fabricated gypsum wallboard elimin ates extreme moisture in wall constructions. LIMITATIONS OF USE: 1. Gypsum Wallboard shall not be used where it will be exposed to water or excessive moisture. 2. Vi" Bestwall Gypsum Wallboard should be ap plied only to existing surfaces or used in temporary or display work. Surfaces should be sound. When necessary, furring strips should not be spaced over 16" o.c. yB~ Bestwall Gypsum Wallboard should not be applied to nailing members spaced over 16' o.c. Horizontal application must be used on ceilings. l/2" or y8* Bestwall Gypsum Wallboard should not be used on nailing members over 24' o.c. When applied to ceilings with the nailing members exceeding 16' o.c. the wallboard must be applied with the paper bound edges at right angles to nailing member. 3. All furring used in application of gypsum wail- board shall have a minimum cross section of 2' x 2' (nominal), with space limitations as above. 2 Squar* Edg* Bvled Edge Taporod Edg* SIZES LENGTH 6 to 16' (in even feet) WIDTH 4' THICKNESSES '/a'- V EDGES Tapered, Square. Bd'v " fid S C ^ C -il ;-!e: '.".y'l DESCRIPTION Available with tapered or square edges faced mth a strong, cream faced paper which will take any type of decC'at-.e treatment. ' and Vg" Taoered Edge wallboard are --c ;m-'-ended for single layer application in new construct-on Sr-:-.. d te used with Bestwall Joint System for smoot". s-i'"ess Sur faces. Square Edge is recommended for use.vo-'e -Method joints are acceptable. Greater thickness p'l. :-s -t'ease-a resistance to fire exposure and sound mans-", ss.on Wood stud load bearing partitions faced c : m ides with i ' Bestwall Gypsum Wallboard `-ave i t-ce of 40 minutes, as tested in accordance w.th E i '. j i'.i'dard Method of Fire Tests of Budding Construct-:n : V *:er-a s specified by the American Society for Test i`.e'-a s_ When faced witn >/H" Bestwall, the re e e s -5 minutes. 1' Gypsum Wallboard is used pr n-or v - a-d remodeling work. Light -weight permits -.isy 'g a-a application. It is also recommended for use " ' n -a 'J.-er laminated gypsum wallboard constructi ;n 'fi' Gypsum Wallboard is a Oght-.-.e-o"! i s.-J" sum -wallboard for application directly . .- ' s ind ceilings and for use on ,.urved sm'i - -, -W work SGP 0003941 Decorative Gypsum Wailboard GYPSUM WAILBOARD PRODUCTS Insulating Gypsum Wailboard Wood Grained Gypsum Wailboard SIZES LENGTH 8'. 9', 10' WIDTH 4: THICKNESSES EDGES Vb' ('/>" n order) Beveled (Figured Aspen, Driftwood, Autumn Mahogany and Fawn Mahogany) Square (Knotty Pine) DESCRIPTION Bestwall Wood Grained Gypsum Wailboard is regular gyp sum sailboard prefinished with reproductions of true-wood patterns. These photographic reproductions are printed on special paper, finished with a durable transparent coating and are cemented to the face of regular gypsum wailboard. Combines all the advantages of regular gypsum wailboard with the economy of natural-looking wood grained predec orated panels. It handles as easily as regular gypsum wallboard and can be scored and snapped off to the desired size or can be sawed. AVAILABLE IN FIVE FINISHES: Oriftwood Mahogany, Knotty Pine, Autumn Mahogany Figured Aspen. Fawn Mahogany Matching color headed nails are recommended. Joints pre sent a pleasing panelled effect when left unfinished. If de sired. they may be covered with wood strips to achieve a more pronounced decorative effect. Although factory finished, the surface may be covered with a coat of dear shellac or varnish, then waxed for added beauty and protection. An occasional wipe with a damp cloth is all that is necessary to keep the wailboard fresh and clean. Vinyl Surfaced Gypsum Wailboard Available m six lovely pastel shades of, Seafoam Blue. Shadow Gray, Spring Green, Sunset Pink, Sand arid Snow drift m a distinctive linen weave texture. SIZES LENGTH 6' to 16' (in even feet) WI0TH 4' THICKNESSES EDGES !V. V Tapered. Square DESCRIPTION Bestwall Insulating Gypsum Wailboard is -eguiar gypsum wailboard with aluminum foil laminated to the back surface. In a single application it provides the advantages of regular gypsum wailboard, an effective vapor barrier ana .nsuiatmg qualities. INSULATION Panels must be installed with foil s.de agam-t me studs. To have reflective insulation value. F H A ^r-s a m-m mum air space of '. The aluminum foil, accoramg to U S Bureau of Standards Tests, reflects 90',, of im.u-t heat It provides insulation approximately equal to : 'berboard VAPOR BARRIER Bestwall Insulating Gypsum WjHboard cient vapor barrier. The aluminum foil entering the e<terior wall construction fe uensation in stud spaces. f, SGP 0003942 3 GYPSUM WALLBOARD PRODUCTS Gypsum Sheathing Bestwall Firestop SIZES LENGTH a-. 9' 8', 9' WIDTH 2' 4' THICKNESSES EDGES V edge `/a' Tongue-and-Groove Vi' Square DESCRIPTION Bestwall Gypsum Sheathing is the only gypsum sheathing reinforced with glass fibers. The "asphalted" reinforced gypsum core is protected by highly water repellent paper, eliminating need for an underlayer of treated building paper (except where required by local building codes). The 2' wide sheathing is manufactured with precision-cut tongue-and-groove edges to provide a structura"y strong and stable wall. V-tongue-and-groove edges fit snugly, mini mizing wind infiltration. The 4' wide square-edge sheathing, applied vertically, completely eliminates the need for corner bracing. It is designed to meet FHA Technical Circular 12 requirements. Racking Tests were made in conformance with ASTM E72. FEATURES Fireproof--Officially rated for one full hour fire-resistance from both sides in combination with gypsum wallboard applied as specified ever wood studs and any exterior finish (wood siding, stucco, brick veneer, etc.). Glass Fiber Reinforced -- This exclusive development assures greater flexjbilty and resistance to shock and set tling, better nailing qualities and strength. Water Repellent--The gypsum core contains an emulsion to provide high resistance to water. Meets ASTM 79 54 including the water resistance test. Economical--Large panels cover large areas quickly. 8ui!ding paper is not required (except where demanded by local building codes) New 4 sheathing eliminates comer bracing, thus keeping 'jbor and material costs to a minimum. SIZES LENGTH 6' to 16' (in even feet) WIDTH 4' THICKNESSES Vs' EDGES Tapered. Square or Tongue-and Groove DESCRIPTION Bestwall Firestop is the original drywall material to pro vide up to one hour fire resistant load bearing wans and ceilings with one layer application over both oombust-ole and incombustible framing. It was also first to provide two- hour fire resistant load bearing walls m two layer jpc'.ca- tion. It combines all the advantages of regular gyesum wail- board with increased fire protection--the resut :f an exclusive Bestwall manufacturing process. Incombustible glass fibers and unexpanded vermiculite are added to '~e gypsum core. The glass fibers remain strong u'der e>t-e~e heat and help keep the gypsum core intact, even Jl'er t_e chemically combined water has been released r"e vex- panded vermicuhte expands under heat,- toerebv o.va-: ~g the shrinkage of the core after the loss of w3ter ti-j "emo- stabilized gypsum core, having increased msuiat'.m. . i at extreme high temperatures, provides up to t --es greater fire resistance than conventional gypsum i ccard. ADVANTAGES Crack-Resistance: resists cracks due to fra-o-g -ovements. vibrations and settling. Unaffected by "or .: ty or extremes m temperatures. Strength: resists crosswise stresses. % ' Fires: ::: -s "ex- ural strength of 225 to 275 lbs. as compared :; '5''.' 'm- nuiin requirement of 145 lbs for %' reguijr - . wa.I- board and a Federal Specifications minimum --"t _f 105 lbs for 1 j ' regular gypsutn walibojrd SGP 0003943 I?* s > f GYPSUM WALLBOARD PRODUCTS MEETS BUILDING CODE REQUIREMENTS Building Code requirements may be met with Bestwall Firestop for 45 minute to 3 hour fire-resistant interior wall and ceiling construction in buildings of all types from highly incombustible to wood frame; and for various occupancies of residential, public and commercial character. SOUND TRANSMISSION RATINGS Results of sound transmission test by Riverbank Labora tories on a standard wood stud partition faced each side with single layer of ya" Bestwall Firestop Gypsum Wallboard show a 39 decibel noise reduction value with density of 7.2 pounds per square foot. FIRE RESISTANCE Bestwall Firestop is recommended where extra fire resistance is required in residential, commercial and public buildings. 5/a' thickness provides one-hour fire resistance in single layer application on both walls and ceilings over wood or steel. l/2~ thickness provides 45 minute fire rating in single layer application when applied over wood framing, for both walls and ceilings. The extra fire protection offered by Bestwall Firestop is built right into the core through the use of specific amounts of incombustible glass fibers and unexpanded vermiculite. 5/9' Bestwall Firestop qualifies for building code acceptance in all the constructions in the table below. Bestwall Firestop is listed by Underwriters' and carries the UL Label for 1, 2 and 3 hour Fire Resistance in various designs and for Fire Hazard Classification of 10-15. FIRE HAZARD CLASSIFICATION Flame Soread Fuel Contributed Smoke Developed 10-15 5-IS 0 45 MANIFEST FOR WAUIOAI* ISSUI BESTWALL FIRESTOP FIRE RETARDANT CLASSIFICATION Floor and Ceding Oesign No 1 --L hr. Design No 2 -- 1 hr. Design No 3--l V* hrs. Walls and Partitions Design No. 5--1 hr Design No. 7--2 hrs. Design No. 5--2 hrs. Design No 10--l hr Design No. 5--3 hrs. Design No 11--1 hr. ; m% mu i h i ii ftliilllieilMillMli i FRAMING Metal Studs 24" Max ) O.C. 2" i 4'. Wood Studs 15 1 0 C NONE 12" 9ar joists 24" 0 C Covered with 1" concrete Moor slab CONSTRUCTION RATING AUTHORITY 1 layer. Vj" Bestwall Firestoo both s.des. 2 layers. v| ' 3-istwaU Firestop both vdes l 'ayer ^ ' Bestwall Fuestoo both s.des l layer !/j ` Bestwall Firestop both s.des 1 Hour 2 Hour l icur 45 Min. Test by ndeoendent, nationady-known laboratory. Name on request Test by independent, nation* lily-known laboratory. Name on reQuest. ij.-.oerwpters' Laboratories Retardant 2389 - 3 /5/47 U*derw'iters' Laboratories Retardant 2717 7/29/46 l layer. %" Bestwall F-restop both sides over 1" ?ypsum strips l layer. % " Bestwall Firestop covered by '$ ' Bestwall Gypsum Wallboard both sides over 1 ' gypsum strips 2 layers. Bestwall Firestop both sides over [" gypsum strips PARTITIONS--NON-LOAD BEARING 1 Hour Jrde'wr'ters' Laboratories Retardant 2717 19-216/3/57 ll* Hours 2 Hour and 3 Hour Underwriters' Laboratories Retardant 2717 24-6/17/60 Underwriters' Laboratories Retardant 271 7 20-22- 3/26/57 - 1 'ayer. v8 ' Bestwall Firestoo as ceiling surface through metal furring FLOOR AND CEILING* 1 Hour Underwriters' Laboratories Retardant 2717-16 12/1/52 2 layers. Bestwall Firestop as 'eilmg surface through metal 'ufrmg l ; j Hours Underwriters' Laboratories Retardant 27 1 7 21*12/1/59 UL DESIGN NO. ICBO RESEARCH RECOMMENDATION 11 1155 - ; :co 5 U45 l-- J 10 1! 14 -- 7 1263 5 2 3" 11:5 2" t 13" Wood loists l layer `j Sesrwall 1 Hour Underwriters' Laboratories l Covered with wood Firestoo JS ceiling sjrface Retardant 2 7 1 7 7 / 12/5 1 I' 15 subtloonng building paper, 1 layer M ` 3estwall 15 Mm 11~ jerwriters' Laboratories l -- wood finish flooring Firestoo as ceding surface Retardant 27 1 7 6/^/50 "" " PUJS i flan* Sprn6 Rating of 1 (Mt for both Vi" and flrutop based on Official Underwriter*' Tunnei Furnace Tasti and listed by them for fir* Htrard Ciass'f'cation f OU ARE PROTECTED AGA1NST SU SST1 TUTi ON jf--,.?fiorfTM*er'albY''''l<`'*,''rs` LaOoiator.esLjOel'i-ivice a s >*vi !* ed by :e!*f.'.rrs ! j dom tof es *' 3 ' *st wnicn apcears on :he twin mounting tape b.'Srg -*ach bunjie `if 2 uieLes AJ -ueciailY'moo riant to atch.teds and budjmg n spec1 :s ; narked w-th Bestwall Ft estop so that ,t seas/ in Details of construction jnj ..itormatiun aoout iounj t'jnsm.ssion -jUng ;-jl strergtn bjcher `or acoustical Me wiil be sent upon your -eo-esi ' -in ' * 5 SGP 0003944 ro | iv GYPSUM WALLBOARO PRODUCTS Technical Data Wallboard Construction CONSTRUCTION WALL SURFACE FIRE RATING WEIGHT SQ. FT. NRC 1 (AVERAGE! DECIBELS^ PARTITIONS: Wood Studs 16" on center unless noted otherwise. Load bearing and non load bearing unless noted. PARTITIONS: Steel Studs 24" on center (Nailable) load bearing PARTITIONS: Gypsum Studs Non Load Bearing CEILINGS: CEILINGS: Wood Joists 16" on center unless noted otherwise Fm.shed wood floor on rough wood subfloor Steel Joists 24" on center unless noted otherw.se. 1" Cement Moor slab cross lurrmg 16" center Surfaced both sides with Surfaced both sides with Partitions 2Vi" Thick 2'/4" Thick 6" Thick 4" Thick 5" Thick Ceiling Ceiling y8" Bestwall V|" 3estwall \'i" Best-wall with Mineral Wool m stud space. 8estwall Firestop % " Bestwall Firestop 2 layers V Bestwall. Bestwall Hummer System "A" 2 layers Vi" Bestwall 2 layers Vi" Bestwall Firestop Vi" Bestwall Firestop 2 layers Bestwall Firestop separated by 1 ' Gypsum Studs 8estwail Hummer System "B" 2 layers Ve" Bestwall separated by V4" Gypsum Studs. Bestwall Hummer System "C" 1 layer 8estwaH Firestop plus 1 layer Bestwall Gypsum Wallboard on each side of 1" Gypsum Studs. 2 layers V Bestwall Firestop on each side of 1 ' Gypsum Studs 2 layers Vt " Bestwall Firestop on each side of staggered 1" Gypsum Studs Ji ' Bestwall Vi" Bestwall Vt" Bestwall Firestop V| ' Bestwall Firestop V Bestwall Firestop 2 layers 1 j" Bestwall 2 layers Vi " Bestwall V|" Bestwall Frestop Vi" Fuestop Backer 2 layers v" Bestwall Firestop 25 minutes 40 Minutes 1 Hour 45 Minutes l Hour 1 Hour 1 'i Hours 2 Hours 1 Hour 1 Hour 45 Minutes 1 Hour l Vi Hours 2 Hours 3 Hours l5 Minutes 25 Minutes 30 Minutes 45 Minutes l Hour 30 Minutes 1 Hour 1 Hour l Hour 1 '.i Hours 59 -- --. 72 8.2 -- 12.9 65 72 77 7.8 -- 13 4 13 4 _ 11 4 -- -- 12 0 12.4 -- 34 2 34 1 6 a 35 _ 39 _38 45 -- 35 39 40 -- 37 40 _ -- -- -- -- 32 ~ 44 -- STEEL COLUMNS: Board tied and Finished 2 layers Vi" Bestwall 3 layers 1 i ' Bestwall 4 layers 1;" Bestwall 1 Hour l Vi Hours 2 V? Hours r re uarard Cassif>:3t:on Official Underwriters Tests Vi" & V" Firestop (Listed) 10 15 's '- Vi", and Vi" Bestwall 'Tested Not L .) .5 NOTE: This table is a summary only based on tests at Underwriters Laboratories. National Bureau of Standards 3nd/'or Ohio State University, sponsored by the 3es>ail GfOsum Comoany. the Gypsum Association and/or others. The fire rating, weight and sound characteristics are based on a combination of specific ietans as n official publications of Underwriters Laboratories, the National Bureau of Standards. Ohio State University and/or the Bestwall Gypsum Company. 'Inconsistencies Due to Reports covering 15 years and work of different laboratories, iDetails on request) Typical Bestwall Applications I Two loyers of BesTwall gypsum wallboard as ap plied in Bestwall Hummer System A, through lami nation, to any frame wall or ceiling construction. 6 Smooth surfaced walls of permanent beau:/ easily be obtained through use of any fb application. J r SGP 0003945 BESTWALL HUMMER SYSTEMS j 12c GYPSUM WALLBOARD Be HUMMER SYSTEMS four advanced methods for multiple layer applica tion of gypsum wallboard for partitions, walls and ceilings. The Bestwall Hummer Systems A. B, C and D are specially designed methods for erecting gypsum wallboard in multiple layer applications. Developed by Bestwall through E. B. Hum mer. nationally known wallboard specialist, these original, field proven laminated drywall constructions permit the selec tion of an interior appropriate to intended use and meet various fire ratings and economy requirements. They may be used with conventional framing (without framing in nonload bearing partitions) to provide low-cost, high quality wall and ceiling surfaces. These original laminated gypsum wallboard constructions provide strong, durable walls and ceilings with great resist ance to sound and heat transmission and superior fire pro tection. Subsequent maintenance costs are kept to a minimum. Erected with Bestwall Gypsum Wallboard, applica tion costs are moderate because of convenient-sized sheets and minimum waste. Further economies are realized by savings on materials and labor, depending on the system used. Most interior framing can be eliminated when some of the constructions are combined with trussed roof construc tion in residential work and for non-load bearing partitions in commercial, institutional and industrial buildings. Thin wall sections--2l/4" thick--make it possible to use many standard thin wall-opening details. Modern, narrow, plain trim fits m with these thin laminated gypsum wallboard partitions. Systems A, B, and D are designed to have the |Oints treated with a paper tape and cement to present a clean, unbroken surface. (See p. 14 for Joint System details.) System C, built with prefabricated panels, is a non load bearing wall construction for use where joints are left unfin ished. More detailed specifications and architectural con sultation are available upon request. "A" SYSTEM Bestwall Hummer System A is the original laminated gyp sum wallboard construction for applying gypsum wallboard to frame construction. Two layers are used. The first is nailed. The second is applied with adhesive and screws to eliminate nail popping and |Oint beading. A tapered edge board with a center taper is used on the ceiling. "C" SYSTEM Bestwall Hummer System C is the original and only fac tory fabricated construction providing movable or perma nent gypsum partitions. Ideal for less than ce-ling high partitions for fast, low-cost dividing walls in large office or loft buildings. An entire room can be erected, trimmed and painted in one day. Special edges provide an att-active panelled effect. J1$ -------------- -------------------------- r--t --L-v------i...___ :____ k \ SYSTEM A SYSTEM C '8" SYSTEM Bestwall Hummer System B is the original system for con structing non load bearing smooth surfaced partitions entirely of laminated gypsum wallboard. Sheets of 4' wide V,- Bestwall Firestop are laminated together with narrow strips used between them to provide bulk and weight. The construction provides 1 hour fire resistance and. with varia tions. I'.-'-. 2 and 3 hours fire protection. "0" SYSTEM Bestwall Hummer System D is the - : low cost gyosum wallboard |Ob laminated construction. Full size sheets are applied to the framing of walls and ceilings over st'-ps of gypsum wallboard. There is less cost in place, yet the finished surface closely matches a complete two layer installation. SYSTEM B LL~ -I Lr- SYSTEM D SGP 0003946 7 BESTWALL HUMMIH SYSTEMS^ SYSTEM A SPECIFICATIONS Materials: All gypsum wallboard and joint system materials required for installation of . 8estwall Hummer System "A" shall be as manufactured by Bestwall Gypsum Co. 1. 3/s' backer board, 4' wide (or Z wide) gray face and back paper. 2. ya~ Tapered Edge Bestwall Gypsum Wallboard. 3. Ya~ Tapered Edge Bestwall Gypsum Wallboard with Center Taper parallel to long edges of board. 4. l5/a' GW8-54 gypsum wallboard nails or 1V8" long, .098 gauge annular ring nail with head and a medium diamond point. 5. lVi", 4-d, 13 gauge, `/4' flat head blue diamond point nail. 6. %*. No. 14 Phillips flat head Type A (Tapping) screw, American Screw Co. of Chicago, III.), or equal. 7. Bestwall Joint System materials, including Laminating Compound, Cement, Bedding Compound, Topping Compound, and Tape. Construction: a. Ceiling and Sidewalls (first layer)--For ceil ings and sidewalls install first layer of Ya" Bestwall Gypsum Backer board at right angles to framing members. Edges shall center on studs and joists, using ll/i~ long blued nails (or staples) at 5" to 7" o.c. on ceilings and 6' to 8" o.c. on walls. DO NOT DIMPLE THE BOARD. NOTE: Face wallboards shall be bowed as per details. b. Ceiling (face layer)--Apply Bestwall Laminating Com pound on back of face layer board or to Backer Board and install the Ya' Bestwall Tapered Edge Board with center taper at right angles to joists. Neither end joints nor edge joint in the face layer shall fall over the joints in the back layer. No edge joint in face layer shall fall over a joist, but be so installed as to fall midway between joists. End joints may fall over or between joists. Nail face board at edges and center taper and before laminating compound has set, drive 3/4" No. 14 flat head type "A" screws between joists and in tapered edge joint formed by two adjacent boards if joists are over 16' on center. Space screws in end loints 12' o.c. c. Sidewalls (face layer)--Apply similar to ceiling face boards: Nail the top Regular Ya" Tapered Edge Board in Construction Details (no scale) Stud place with 15/8" 5-d annular ring nails Vt' from ceiling line so as to fall under joint treatment. Press board against back layer and nail Ya" from bottom edge at each stud. Install bottom face board similarly to the top board with end joints staggered, if they occur. Vertical end joints to fall midway between studs. Before laminating compound has set drive V*~ N- 14 Phillips flat head type "A" screws between stud spaces in the tapered edge joint formed by two adjacent boards if studs are over 16' on center. Install screws 12' o c at vertical joints. Bestwall Laminating Compound: Must be mixed to a con sistency so that combed ridges will not self level when the board is in a vertical position (use approx. 2J/4 pounds per one gallon of water). Joint Work: Apply Bestwall Bedding Compound or Bestwall Joint System Cement to the Taper Edge joints and screwheads. Shear off surplus, leaving no material on high edges. Allow 12 hours drying before taping, leaving a uniform depth of taper for uniform shrinkage of joint finishes over and under tapes. Apply Bestwall Bedding Compound or Joint System Cement in taper edge joints and in center taper and embed tape leaving a uniform thickness of material under the tape. When Bedding Compound or Joint System Cement has whitened (surface dry) cover taped joint with Bestwall Top ping Compound. Shear off surplus leaving a uniform cover age over tape with edges well feathered. The Bedding Compound or Joint System Cement under the tape and first coverage of tape with Topping Compound must be thoroughly dry before further treatment. Cover joints a second time with Topping Compound. Shear off surplus leaving a smooth, well-feathered joint. For best results and a more uniform suction, apply a skim coat of Joint System Cement or Topping Compound over the entire surface and shear off tight in lieu of a third application of Topping Compound to joints only. Decorating: Decorating of finished walls is to be done by others. Where a skim coat has been used to finish the wallboard, a one-coat paint application may be satisfactory. For best results use a prime coat over wallboard before final decoration. 1 r FLOOR. 8 SGP 0003947 GYPSUM WALLBOARO HUMMER SYSTEMS SYSTEM D SPECIFICATIONS Materials: All gypsum wallboard and joint system materials required for installation of Bestwall Hummer System "0" shall be as manufactured by Bestwall Gypsum Co. 1. J/8" by 8' and y9' by 4" strips of Bestwall Gypsum Wallboard. 2. l/z" Tapered Edge Bestwall Gypsum Wallboard. 3. V2" Tapered Edge Bestwall Gypsum Wallboard with Center Taper parallel to long edges of board. 4. l5/a' GWB-54 gypsum wallboard nails or l5/a" long. .098 gauge annular ring nail with head and a medium diamond point. 5. 1%\ 4-d, 13 gauge, Vi" flat head blue diamond point nail. 6. 3/4", No. 14 Phillips flat head Type "A" (Tapping) screw (American Screw Company of Chicago, III.), or equal. 7. Bestwall Joint System materials including Laminating Compound. Cement, Bedding Compound, Topping Com pound and Tape. Construction: a. Strips--3/s" gypsum board strips, 8" wide, shall be nailed on both the wall and ceiling framing. 4" strips may be used at ceiling angles and at the floor line on all walls. ya~ gypsum board strips 8" wide by 8' long shall be spaced so that the long edges and center of face board center on those strips. Maximum center to center of the 8" strips shall be 24". 3/a" gypsum board strips 8" wide of sufficient length to span two joists or studs shall be installed between long strips and directly under end joints of face board in ceiling and on walls. Nail strips with two blued nails one inch from edge of strip at each joist and stud. DO NOT DIMPLE THE BOARD. NOTE: Face wallboards shall be bowed as per details. b. Ceiling (Face Layer) Before face beard is installed, cut off all damaged ends and apply strips of Bestwall Laminat Construction Details (no scale) ing Compound to backside of face board or to strips on ceiling. Install V2~ Bestwall Tapered Edge Board with a cen ter taper at right angles to ceiling joists over stripping. No edge joint in the face layer shall fall over a stud or joist. End joints may fall midway between studs or joists or over joist or studs. After the board is in place, nailed in edge and center taper only, and before the laminating compound has set, drive 34" No. 14 Phillips flat head Type "A" screws in the tapered edge joint formed by two adjacent boards. Screws are required in the edge taper if joists are over 16* o.c. Screws also shall be installed at 12" o.c. at end joints falling between center of joists. c. Sidewalls (Face Layer) Regular l/2" Tapered Edge Board shall be applied horizontally over the walls. Bestwall Laminating Compound shall be applied in strips to the back of the face board or to the strips on wall. The top face board shall be nailed in place with 5-d, 1%' annular ring nails Vz" from ceiling line so as to fall under joint treatment or proposed trim. Press board against strips and nail 3/a" from edge at each framing member. The bottom board shall be installed similarly to the top face board with end joints staggered, if they occur. Vertical end joints between face boards may fall midway between or over studs. After the board is in place and before the Laminating Compound has set. drive 3/4 ' No. 14 Phillips flat head Type "A" screws between stud spaces in the Tapered Edge joint formed by two adjacent boards if studs are over 16" o.c. Screws shall also be installed 12" o.c. at vertical end joints. Bestwall Laminating Compound: Must be mixed to a con sistency so that combed ridges will not self level when the board is in a vertical position (use approx. 2% pounds per one gallon of water). Joint Work: . . . See System "A" Specifications. Decorating: Decorating of finished walls is to be done by others. Where a skim coat has been used to finish tne wallboard, a one-coat paint application may be satisfactory. For best results use a prime coat over wallboard before final decoration. section THRU WALL :jj' 1 '~=~ 48" w I D EE a O AB P k- :i'r- LT^cr ,\ I Joist 1 :- | jr * 14 o V r'Ti 9 SGP 0003948 BISTWALL. HUMMER SYSTEMS | SYSTEM 8 SPECIFICATIONS Materials: All gypsum wallboard and joint system materials required for installation of Bestwall Hummer System "B" shall be as manufactured by Bestwall Gypsum Co. 1. Vg" Bestwall Firestop Tapered Edge Gypsum Wallboard. 2. Gypsum Wallboard Studs, Factory laminated (or on lob). 3. I Vi" and l'/a" No. 14 Phillips flat head wood screws (American Screw Company, Chicago, III.) or equal. 4. Nails. Rawl type drives, screws, etc. as shown in details. 5. Bestwall Joint System materials including l.ammating Compound, Cement, Bedding Compound, Topping Com pound, Tape, and Texture. 6. Metal and/or wood, door frames, runners, trim, caps, etc. as per details. Construction: a. General Preparation--Floor runners for par tition work shall be laid out and fastened securely to the floor. Where partitions extend to ceiling, the ceiling runner shall be plumbed up over floor runner and fastened in place. Install 2' x 4" nailers between joists at 24' o.c. where par titions run parallel with joists. Where one piece door frames are used, they are to be set in place and braced. b. Erecting First Side of Partition (Panels with Rib At tached)--Apply Bestwall Laminating Compound with box type comb spreader to the overlapping edge or strip. Set panel in position, hold in place and nail panel to the ceiling and floor runners with 1 .098 gauge annular ring nails spaced 5" to 7" o.c. Reinforce joint between panels by installing ll/2~ long Phillips flat head wood screws in the taper, 3/t' from edge of board spacing screws 24' o.c. c. Erecting Second Side of Partition (Panels without Ribs Attached)--Apply strips of Bestwall Laminating Compound to back of face board with box type comb spreader where board comes in contact with laminated ribs in place. Set face board in place and nail at top and bottom in the same manner as the first side. The edges in the second sheet shall be offset so that the vertical joints in the finished ivall do not fall over the joint in opposite face board. After two of the second face panels are in place, reinforce the joints by installing l'A' Phillips flat head wood screws m the joint, 1 ft. from ceiling or floor-spacing screws 24' o.c, d. Door Openings--Fill in nb space around door and other openings in the wall with a 3 Vi" rib covered on both sides with laminating compound. Drive wood clamps in place immediately and allow at least 12 hours setting time. After clamps are removed, the door and iambs shall be set in openings and trimmed, and the base and ceiling molding nailed in place. 1' x l5/a' wood may be used for core space filler. 6%' ribs shall be used for doors weighing 100 pounds or more. e. Self-Furring Walls--To keep gypsum board panels from contact with exterior masonry walls, nail no-drip shims to panel ribs. Electrical Work: Thin vail conduit can be installed after the first side of the partition is in place, and run m the nb space vertically and along the top and bottom of the panels in the space left by holding the rib strips back from panel ends. For rigid conduit requiring l* 4 ' space 2 strips ' V' board should be used. This .viil result m a 2` . ' thick wall. Runners, door frames, and trim should be specified accord ingly. The opposite side of the panel is set in place after the conduit is installed. Fire Rated Walls: 1. 2 and 3 Hours (Non Load Bearing): The 21 4 ' wall described above with certain additional mechanical fastenings (closer spacing) is listed by Underwriters' Liboratories as l Hour Fire Resistive (see Bestwall detail pi .in sheet No. 5583--' Bestwall Firestop Gypsum Wallboard One Hour Non Load Bearing Studless Wall ) Adding one additional layer -if ,' board on nj,:n cle of the partition with two runners and making me t.'.o s lies independent results in a wall 4" thick which is listed by Underwriters' Laboratories as 2 Hour Fire Resistive (see detail plan sheet No. 5584--"Bestwall Firestop Gypsum__ 2 Hour Non-Load Bearing Studless Wall"). Separating the two double layer faces by an additional inch making a wall 5' thick gives a wall section listed by Underwriters' Laboratories as 3 Hour Fire Resistive (see Bestwall detail plan sheet No. 5585--"Bestwall Firestop Gypsum 3 Hours Non Load Bearing Studless Wall"), Joint Work: Apply Bestwall Bedding Compound or Bestwall Joint System Cement to the Taper Edge |Oints and screwheads. Shear off surplus, leaving no material on high edges. Allow 12 hours drying before taping, leaving a uniform depth of taper for uniform shrinkage of joint finishes over and under tapes. Apply Bestwall Bedding Compound or Joint System Cement and embed tape leaving a uniform thickness of mate rial under the tape. When Bedding Compound or Joint System Cement has whitened (surface dry) cover taped joint with Bestwall Top ping Compound. Shear off surplus leaving a uniform cover age over tape with edges well feathered. The Bedding Compound or Joint System Cement under the tape and first coverage of tape with Topping Compound must be thoroughly dry before further treatment. Cover joints a second time with topping compound. Shear off surplus leaving a smooth, well-feathered joint. For best results and a more uniform suction, apply a skim coat of Joint System Cement or Topping Compound over the entire surface and shear off tight m lieu of a third application of Topping Compound to joints only. Decorating: Decorating of finished walls is to be dene by others. Where a skim coat has been used to fimsn t_e wallboard. a one-coat paint application may be satisfactory. For best results use a prime coat over wallboard before "nal decoration. This modern insurance office is typical of r-'v.. ts obtained through the use of Bestwall H ......vr System 8. 10 SGP 0003949 Construction Details (no scale) GYPSUM WAimntun hummer systems APPLICABLE TO "B" AND "C" wi,h ielf furring wa" U BESTWALL HUMMER SYSTEMS j SYSTEM C SPECIFICATIONS Materials: All gypsum wallboard and laminating compound required for installation of Bestwall Hummer System "C" shall be as manufactured by Bestwall Gypsum Co. 1. 24' wide, beveled edge Bestwall Hummer "C" Panel, 8', 10', or 12' long. 2. Naiis, rawl drives, screws, etc., as shown in details. 3. li/2" No. 14 Phillips flat head wood screws (American Screw Company. Chicago, III.) or equal. 4. Bestwall Laminating Compound, non setting mastic, and quick setting mastic. 5. Metal and/or wood, door frames, runners, cap and trim as per details. 6. Metal corner and casting sections as per details. Construction: a. General Preparation--Floor runners for par tition work shall be laid out and fastened securely to the floor. Where partitions extend to ceiling, the ceiling runner shall be plumbed up over floor runner and fastened in place. Install 2" x 4" nailers between joists at 24' o.c. where par titions run parallel with joists. b. Erection of Panels--After floor and ceiling runners are installed including runners at intersecting walls, install 24" "C" panel as outlined. Stagger joints in the partition to develop the tongue and groove feature. As each panel of the opposite face is set in place, run ribbons of Bestwall Lami nating Compound, for permanent partition (non-setting mastic for movable partition) down the strips of y8" board on the back of the panel. Set them m place. Use punch with Vi" pinto countersink for heads of IV2" No. 14 Phillips head wood screws to be driven in the tongue of the previous panel set in place. Install 1 V2 ' No. 14 Phillips head wood screws approximately 24 inches o.c. The panels on the op posite side shall be held in place so that the screw can be drawn up tight without stripping. c. Opemn,- ,--After the panels are erected, the doors and jambs shall set in the openings and trimmed and the base and ceilmi aiding nailed in place. Where an opening has been -e wall section leaving a hollow space at the open jt pieces from erected panels, or wood IVa". shall .. glued on the sides and inserted around the openi. ,der that they have a solid gypsum rib core at least 3" wide at the edge of every opening to give rigidity and backing for the installation of the casing and trim. d. Self-furring Walls--On existing smooth interior walls apply a coat of Bestwall Laminating Compound or non set ting mastic on panel ribs, press panel firmly against wall and hold permanently in place with Phillips head wood screws or nails at the top. bottom and middle of panel. For rough in terior and exterior walls install "C" panel with "no drip" shims and filler strips as shown on details. Flat head nails shall be driven at top, bottom and middle through tongue and shim. Metal Corners and Base--Note: Where local code requires a noncombustible partition, add the following: All floor, ceiling and wall runners at intersecting walls shall be sheet metal of 24 gauge as per detail No. 1 on drawirg No. 1. All cut ends of partitions shall be concealed with a metal corner closure or moulding. Metal door frames and base boards shall be used. Electrical Work: Thin wall conduit can be installed after the first side of the partition is in place, and run in the rib space vertically and along the top and bottom of the panels in the space left by holding the rib strips back from panel ends. For rigid conduit requiring wider space a 2%" x ]/a' strip may be used at each rib between panels to widen space to l'/8. Runners, door frames, and trim should be specified accord ingly. If necessary, the back panel may be gouged out tor connectors at boxes. Do not cut paper between the two full Vi" sheets of "C" panel. The opposite side of the panel is set in place after the conduit is installed. Fire Rated Walls: 45 minutes and 1 hour (Non-Load Bearing): The 2>4" wall described above has been proven by tests to provide 45 minute fire resistance. Adding a strip of V3~ board 8' wide along the center line on the back of each panel before erection results m 3 fin ished wall having a fire resistance of one nour tested by independent nationally known laboratory (name and ;:cy of official test report available on request). Decorating: As there is no Joint System m the wail area, a one coat paint job may give a satisfactory jco -f a "at or semi-gloss finish is used. Wood trim should have j'1 nig holes puttied and primed before final coat cf paint e Typical Hummer System Installations 1 BESTWALL HUMMER SYSTEM A Curved stairway of elegant private residence at Louisville, Ky. 12 BESTWALL HUMMER SYSTEM B Smooth surfaced non load bearing part.: :n beauty and strength as used in board re.. ' Travelers Insurance Co. SGP 0003951 Construction Details (no scale) 13^111 12c GYPSUM WALLBOARD Be HUMMER SYSTEMS BESTWALL HUMMER SYSTEM C Partitions of factory fabricated panels in office at Certain-teed Products Corp. research laboratory. BESTOALL HUMMER SYSTEM D Ceilings and exterior walls of single layer of gyp sum wallboard laminated to strips of gypsum. SGP 0003952 13 WJ&LBOARD APPLICATION DATaI . t ~ 1 Mu Mma' A* -- SINGLE LAYER APPLICATION BESTWALL REGULAR GYPSUM WALLBOARD Where Bestwall is applied directly to wood framing mem bers, ceilings are put up first, then walls. Board layout should be planned to minimize joints. End joints must always occur over a stud. Boards should be accurately cut to fit and joints loosely butted. Horizontal application (long dimen sion at right angle to framing) is recommended where joints are to be concealed. Vertical application is recommended where joints are to be left exposed or finished with metal or wood trim. In ceiling application, the boards should always be applied at right angles to the nailing member (horizontal application). Nails should be spaced not to exceed 7' on ceilings and not to exceed 8" on walls. Advantages of Horizontal Application: 1. Reduces necessary |oint treatment footage. 2. Avoids need for headers. 3. Each board braces more framing members. 4. The fewer joints can be treated at convenient height for finishing. Thickness: %3/a\ >/2\ Width: 4' Edges: Tapered or Square Length: 6' to 16' BESTWALL FIRESTOP y2~ and Va" Bestwall Firestop combine all the advantages of regular gypsum wallboard with increased fire resistance-- the result of a specially formulated core containing incom bustible glass fibers and unexpanded vermiculite. A single layer of l/2~ Firestop on both sides of a load bearing wood stud wall or as the ceiling finish of a standard wood joist and floor construction provides a 45 minute fire rating. One layer of %" Firestop over load bearing wood or metal studs, or used in a non-load bearing Bestwall Hummer Sys tem "B" construction provides one hour fire resistance. One hour fire rating is also provided by one layer of ya" Firestop as the ceiling finish beneath either a wood joist and floor construction or steel bar joist and cement floor construction. Bestwall Firestop is applied in the same manner as Bestwall Gypsum Wallboard. Thickness: l/2~, Va" Width: 4' Edges: Tapered or Square Length: 6' to 16' BESTWALL WOOD GRAINED GYPSUM WALLBOARD In single layer application, with square or beveled edges, presents a more attractive appearance when applied vertic ally. Joints may be covered with wood trim or left exposed. Use matching color headed nails. Decoration: Bestwall Wood Grained Wallboard Gypsum may be given a glossy finish by painting with a clear shellac or by varnishing and then waxing. Thickness: y3" (LV on order) Width: 4' Edges: Beveled (Figured Aspen, Driftwood Mahogany, Autumn Mahogany and Fawn Mahogany) Square (Knotty Pine) Length: 8'. 9'. 10' BESTWALL VINYL SURFACED GYPSUM WALLBOARD Eternawall should be applied vertically by lamination over a backer board or an existing wall. Eternawall may be applied vertically with matching color headed nails directly to framing or to furring strips. Joints may be covered by trim to further accentuate paneled wall or left with beveled edges exposed. No further decoration needed. Thickness: 3/a ' (('>' on order) Width: 4' Edges: Beveled Length: 8' Standard (other lengths on order) Colors: Seafoam Blue. Shadow Gray, Spring Green, Sunset Pink, Sand. Snowdrift BESTWALL INSULATING GYPSUM WALLBOARD Bestwall Insulating Gypsum Wallboard is made by lami nating bright aluminum foil to the back surface of regular gypsum wallboard. Vapor Barrier--It serves as a vapor barrier when applied over exterior walls and ceilings. It is applied with foil surface against nailing base in same manner as Bestwall Gypsum Wallboard. Insulation--To achieve insulation value, it must be in stalled with the foil side against the studs and facing a minimum air space of yt". Thickness: 3/a", Vz" %" Width: 4' Edges: Tapered. Square Length: 6' to 16' JOINT SYSTEM PRODUCTS There are two Bestwall Joint Treatments that literally sur face "weld" Bestwall gypsum wallboard panels together. Each enables the end and edge joints of gypsum wallboard to be concealed by cement and tape. Both are designed to provide smooth, uninterrupted walls with joints as strong as wallboard itself. Complete instructions for treating end joints, nailhead areas, corners and curved surfaces are in cluded on each box or bag. ONE-MATERIAL TREATMENT This system utilizes Bestwall Joint System Cement for both bedding and topping the Bestwall Tape and for spotting nail heads. This treatment is suitable for remodeling as well as new construction work and gives excellent results similar to the two-material treatment. A good "topping-out" job with Bestwall Joint System Cement eliminates sanding, saving time and money for the applicator. Bestwall Tape is designed for rapid drying and to permit air to escape during application and to provide maximum adhesion to cement. TWO-MATERIAL TREATMENT This system combines Bestwall Bedding Compound for bedding the tape and Bestwall Topping Compound for finish ing the joint and spotting nail heads. It is recommended for use on large projects where uniformly good results must be obtained with minimum time and labor. With proper application, sanding is unnecessary. One-Material Treatment Two-Material Treatment DECORATION Gypsum wallboard properly prepared can be decorated with any of the treatments ordinarily used for walls, -nc'udmg oil paints, water paints, enamel and wallpaper 3eiore any decoration after the Joint System is applied, the sur'.ice shall be sealed with a vinyl or pigmented varnish pr.mer For textured finishes, the wallboard surface should he c med with a vinyl primer and the texture applied over the p' "'-.t 14 SGP 0003953 3 i i i i i i l ia^yjHI GYPSUM WAUBOARD APPLICATION DATA ACCESSORIES JOINT TREATMENT SPECIFICATIONS Scope: All walls, partitions and ceilings are included in these specifications. Furnish all labor and material neces sary to reinforce and conceal joints between gypsum wallboards according to specifications. Materials: 1. One-Material Treatment--Bestwall Joint Sys tem Cement (used for both bedding and topping and for spotting nail heads). Specially suited for remodeling and home improvement work. 2. Two Material Treatment--Bestwall Bedding Compound. Bestwall Topping Compound. Specially designed for use on large projects. Reinforcing Tape: Bestwall Tape Joint Work: Apply Bestwall Bedding Compound or Bestwall Joint System Cement to the taper edge joints, end joints and nailheads. Shear off surplus, leaving no material on high edges. Allow 12 hours drying before taping, leaving a uniform depth of taper for uniform shrinkage of joint finishes over and under tapes. Apply Bestwall Bedding Compound or Joint System Cement and embed tape leaving a uniform thickness of ma terial under the tape. If Bestwall Center Taper Gypsum Wallboard is used on the ceilings embed tape in Center Taper at this point. When Bedding Compound or Joint System Cement has whitened (surface dry) cover taped joint with Bestwall Top ping Compound or Joint System Cement. Shear off surplus leaving a uniform coverage over tape with edges well feathered. The Bedding Compound or Joint System Cement under the tape and first coverage of tape with Topping Compound must be thoroughly dry before further treatment. Cover |oints a second time with Topping Compound. Shear off surplus leaving a smooth, well feathered joint. For best results and more uniform suction, apply skim coat of Joint System Cement or Topping Compound over entire surface. Shear off tight in lieu of a third application to joints only. Decorating: Where a skim coat has been used to finish the wallboard, a one coat paint application may be satisfactory. For best results use a prime coat over wallboard before final decoration. INSTALLATION ACCESSORIES Bestwall Metal Corners and Metal Casings Most Bestwall Metal Corners and Metal Casings are made of .018" gauge hot galvanized steel, knurled and perforated for maximum cement and paint adhesion. They provide straight corners and low-cost neat wall closures for uncased openings. Nails may be driven through board into studs, jambs or headers. Some casings may be nailed first and wallboard slipped into place. Typical accessories are shown below. 100, DL-100 and DLL-100 METAL CORNER--Stronger, more accurate external wallboard corners. Easy to apply by nailing through board to stud. Provides proper grounds and precise screed for cement applica tion. Knurled and perforated for maximum cement and paint adhe sion.) Regular 100 has 1" x 1" flanges; DL-100, 1 Vi" x 1'; DLL-100, ll/" x l'/4". 104 ROUND-NOSE METAL CASING --Extra rigid traditional type casing for wallboard construction with streamlined quarter round returns. May either be nailed ;n place first --and board inserted into nose as shown--or slid over wallboard edge at openings, nailed right through board and flange into door buck. Hemmed edge may be left untreated as decorative offset trim. > i i l Cross-section of finished 8t*nH joint. 105 SQUARE NOSE METAL CASING---Same as 104 ex cept for square nose as illustrated. HAT SECTION -- Sheet metal shape ` r jse as floor or ceil . .er-er m 2 1 a ' w.iiite. n I , iit-t ons ; ' wide f r li- -. -. -ijin iner C , .. ..e ! :r Bestwall He J 15 SGP 0003954 U> COMPANY AND SERVICES COMPANY For over half a century, Bestwall gypsum building materials have been accepted as a standard of quality everywhere. This recognition is earned through continued creative research which provides you with better building products and construction components. FACILITIES Strategically located plants across the nation utilize the most modern equipment and production techniques. In addition, quality control and research laboratories continuously check and control the performance of the finished product to meet highest quality standards. An efficient distribution network makes Bestwall a prompt and reliable source of supply. SERVICES Bestwall representatives are qualified to give you assistance if needed to insure that your specifications are complete and applicable. Bestwall Hummer Systems are installed by Approved Drywall Contractors located throughout the United States. BESTWALL GYPSUM COMPANY ARDMORE, PENNSYLVANIA SGP 0003955