Document YD2a6n1nXGdGYkqnQmaXnQV4D

PLAINTIFF'S EXHIBIT USG-1991 i I||S I M )() k is |iil dished as a pi Me to gin id tut hing ami plaster mg prat (ice on the jolt. \\ liyr* because we all know lliat a good plastering jolt is si ill (In- most potent sales promoter we in the plastering industry possess! The KKI> ItOOK is not intended as a complete an liiteet uia! spei ilieat ion, \\ hivh is available on special icipiest in another form. Instead, il is designed for ('minuting bathers and Plasterers, Journeyman bathers and 1`lastetei >*, builders, (ieneral Contractors, and An hitect's Nupcriulendculs--all in the interest of turning out tin- finest possible plastering work. I.el me remind you that anyone of the distinguished US(1 trademark^ lifted below is your assurance of: (1) products of unifoimly high (jualily; (2) products caiefully rescan lud and rigidly tested; (d) produels aicepted and lnisteil by trade and customers alike. And, you can be sure that United States (Jypsum will keep right on guarding the reputation of these products --just as it has been doing ever since the first enc was developed and sold `way back 50 years ago! I'tAMIIC III III Mllll.! TRADE-MARK NOTICE: The following trade-marks identify the parlloitof RED TOP Plaster, Finishes and Lime IVORY Finishing Lime ROCKLATH Gypsum Lath MORTASEAL Masons lime BONDCRETE Plaster for Concrete Surfaces ORIENTAL Colored Plaster and Stucco Finishes SABINITE Acoustical Plaster PYROBAR Gypsum Partition Tll*| COLOR-RITE* Metal lath TRUSSTEEL Truss Designed Studs^' BRACE-TITE* Attachment Clips' CHAMPION Gauging Plaster STAR Gauging Plaster COVER COAT* Finishing Plaster GRAND PRIZE Finishing Lime BRIDJOINT Attachment Clips TEXOLITE Paint Products vairt'a1 ..n ,*0!OT| USG Gypsum, Lime and Sl*l'|]|19 o STRUCTO-LITE PLASTER !'U$|jjt;!l!j All but those trade-marks indicated by an * are registered in the U, 5. Patent 0ffke*1| O P-IS Copyiiiht 1951, Umled SI.let Cypium Company it t,dit&4Q'ijfH: 'III. rimjjpe, II... iM' ijsiii'i; I1-'!: i!? ili1' MMU"nw : i. BB 006 0742 Gypsum ...the basic material for lathing and plastering Wliat is Gypsum? Gypsum is one or llie most common minerals of the earth. Non- nictallic, it is usually in the form of grey or while rock, found in veins varying from a few feet to 20 and .10 feet in thickness. Chemically, gypsum is a mineral composed of calcium sulphate combined with water of crystallization. This "dry" water makes up approximately 20 percent of the weight of raw gypsum rock, and it is this feature which gypsum its fire-protective qualities ami makes it so adaptable for the manufacture of building materials. 93006 0744 y.ilni, ij'i tfiM'l j-it' * ii*! $ It '; R:|3;|iVh' -iif.-sitf'S" TIHHfTTP'tHW.'" - i !' How Gypsum is Processed After gvpsinn is mined or (|inirricd, it is crushed and ground mill I lien calcined (or cooked) to remove the greater part of tire chemically combined water. This calcined product, or I'laslcr of I'aris, is the basic ingicdicnt of all gypsum materials. Com bined with other materials and water, it is used for the manu facture of gypsum lath, partition tile and gypsum plasters. \\ hen it is mixed with water to make gypsum lath or to make a plaster mix on the job, it rc-absorbs the water removed in proc essing and reverts to gypsum. Tin's recombination with water is why gypsum materials give such excellent fire protection to buildings. 8B006 0745 How Gypsum Protects Against Fire When fire heals a gypsum wall or ceiling to about 212 F., the water of crystallization is gradually converted into steam. The water of crystallization effectively retards the spread of flame. For instance, in an average room 10 feet square finished with gypsum lath and plaster, the heat of a fire could convert the water of crystallization in the gypsum into sufficient steam to fill the room three times. The back of the gypsum wall will not be much hotter than 212 F. until all the water is gone-- a slow process. This protects the wood framing, which doesn't start to burn until about -100 F. Selling Action of Gypsum Water is added to gypsum plaster on the job until the material is sufficiently plastic to spread easily under the trowel. After it is applied, the gypsum particles re-absorb part of the water from the mix and the plaster reverts through crystallization to the chemical form it originally had when taken from the ground. The balance of I he mixing water is dried out of the plaster slah through ventilation anil evaporation. When crystals begin to form in gypsum plaster, it starts to harden; this is known as the "selling action" of gypsum. Gypsum which has been calcined begins to set soon after water is added. RED TOP -- Stabilized Set Mill addition of special ingiedienls developed bv USG Research has resulted in the famous "Stabilized Set" of all Rl'.n Top plasters. Rta> Tot* minimizes variability in sets often caused by sand and water impuiilies which would accelerate or retard the set of ordinary plaster. Whether machine or hand mixed-- applied over metal, wood, gypsum, insulating lath, cement block, brick, day or gypsum tile--a scratch or brown coal of Rl'.n Top mixed with sand or lightweight aggregates (vcrmietilile, perlite) sets more uniformly. It also sets to more uniform hardness, providing a better surface for application of white coal. The set progresses evenly from the base out to the surface. Why gypsum is better for building lu addition to its outstanding fire protective finalities, the mineral gypsum will not rot nor decay and combines light weight with strength. It builds durable walls that last a lifetime, and may lie economically adapted to any architectural design. 8 Plaster Bases ROCKLATH plaster base PYROBAR and other Masonry Plaster Bases WEATHERWOOD Fiber Insulation Lath USG COLOR-RITE Metal Lath and Accessories PAGE 10 17 20 21 1'ropcr use and application of USt 1 plaster bases is important in the construction of strong durable finished walls and ceilings. A secure bond between the plaster and plaster base i- essen tial to develop strength and resistance to abuse and cracking. Gypsum plaster adheres to a plaster base because a bond is developed which virtually makes the two materials a solid unit. A ``mechanical'' bond is formed when plaster is pressed through the mesh or holes of the lath, forming keys on the other side. The keys actually "rivet" the plaster and lath together. This mechanical bond results when plastering over metal lath or perforated gypsum lath. A "suction" bond is formed when gypsum plaster is applied over gypsum lath, tllccr insulation lath and masonry bases. In this rase the liny needle like plaster crystals penetrate into the surface pores of the base by suction. When the plaster sets, the base becomes "welded" to the plaster. When perforated gypsum lath is used, both suction and mechanical bonds arc developed. ill'' '' : ''*`1 ''' i >t. ;" i ,f; j ! ;' t'?tr'!l;d ; r`!< ; ] ! rw Itim I 8<7i0 900b6 Plaster Bases Plaster llasc is a gypsum lath made in sheet form in thicknesses of * * in. ami \-i in. It consists of a core of gypsum pressed and rolled between two layers of special absorptive paper, and is the standard of excel lence for receiving gypsum base coat plaster. ADVANTAGES Fireproof--Kocki.atii has an incom bustible gypsum core and will not transmit temperatures much over 212 degrees !'. until completely cal cined. Resistant to Sound Transmission -- Wood stud partitions with Rocki.aiti and gypsum plaster on both sides have a high resistance to sound transmission. (.See Kocki.atii Resili ent System /wge 5.S' for higher sound transmission resistance.) Strong Bond--(iypsum plasterbonds to Riicki.aiii with a safety factor of I I I -- far higher than required to meet usual construction standards. Structurally Strong--Large unitsadd resistance to racking of framing members. Durable--Not harmfully affected by decay, dry rot or normal moisture. Will not attract vermin. Economical--The low cost of Rocki.aiti, its ease and speed of erection ami avings in plastering arc outsl 1 Img. LIMITATIONS OF USE 1. (iypsum lath, )-fj in. thick, is de signed for supports not to exceed 16 in. o.c. Tor framing spared more than 16 in. o.c. but not more than 21 in. o.c., Yi in. thick Rocki.atii should be used. 2. One-half inch Rocki.aiii on sup ports over 16 in. o.c. must be plas tered in three coat method. 3. (/sc with gypsum plaster only, llond between lime or port land cement plaster and Rocki.atii is inadcc|ualc. 4. (iypsum lath and plaster, painted with 3 coats of lead and oil, has a vapor permeability of about 1'crms (grains of water per square foot per hour per inch of mercury vapor pressure difference). Tor higher resistance to va|>or transmission, use Insulating Rocki.atii plaster base. 5. Do not use in areas exposed to excessive moisture for long periods of time. Use galvanized metal lath and porlland cement-lime plaster. 6. Where one hour fire resistive rat ings arc required, Perforated RockLAlll plaster base should lie used. Lot(orated ROCKLATH is identical to plain Rocki.atii ex cept that :l\ in. round holes are punched through the lath I in. o.c. These perforations allow the applied plaster to `'mushroom" through the holes and form "rivets" to mcchani- callv key the plaster to the Rock1 ami. providing both media nil al and suction bonds. ADVANTAGES Same as plain Rocki.atii but with higher lire rating, (lives one hour fire rating on partitions with } '1 in. gyp sym plaster sanded 1:2-l :2 by weight, or gypsum-perlite plaster KM) lbs. to 2)o cu. ft. and a one hour rating on ceilings, with \gypsum peililc plaster proportioned 1(10:2)2. LIMITATIONS OF USE Same as for plain Rocki.atii plaster base, except perforated Rockiaiii should not be used on icilings with Resilient Rocki.atii dips or other side suspended clip systems. Illustration of Importance ol Vapor Barrier Intlrfa Almatphara 70'f 45% 3.63 0.332 In. HO. humidity Groin* p cu. ft. Ittvllanl vapor prattwra Oulida Almotphara 10"? 90% 0 69 0 067 in. HO. Insulating ROCKLATH is manufactured with a sheet of bright aluminum foil laminated to the back of plain Rocki.aiti. It pro vides insulation against heat and cold and is an effective vapor barrier. ADVANTAGES All those of plain Rocki.aiii plus: 1. Insulating value equal to \'i in. fiber insulation boaid. 2. Aluminum foil is one of the best vapor barriers known and used com mercially. 3. Kconomical--one material, one application provides plaster base, insulation, vapor barrier. LIMITATIONS OF USE Same as plain Rocki.aiti pht'lcr base. Use only `'ti the interior of exterior walls and top llnor ceilings. IMPORTANT When Insulating Rocki.aiti is in stalled with at least a :1.| in. air spate next to the foil, it has the same insnlating value as a half inch of fiber insulating board. When used on horizontal surfaces, its insulating value is increased three limes in re tarding downward llow ol heat. An efficient vapor barrier should be installed in all exterior walls and ceilings where freezing weather oc curs for extended periods of lime. 'The vapor barrier should he located on the warm side of the exterior wall or lop lloor ceiling. 10 8B006 0749 88006 0750 T V.iddt.LelMl 5r-i^;v^prar . -- 13 c-,, TECHNICAL DATA 33006 0751 PARTITIONS Construction %' Plain ROCKLATH, nail-on 2* x A* studs. % Plain ROCKLATH nail-on, 2" x 4* studs. V% Perforated ROCKLATH noi(-on, 2" * 4" studs. %' Perforated ROCKLATH nail-on, 2* x 4" studs. . Total Weight lbs. per Sq. Ft. Lath and Plotter Only Plaster A Aggregate 12.0 Gypsum-Sand 1:2 --1:2 11.0 Wood fiber plaster. 12.0 Gypsum-Sand 1:2 --1:2 8.0 Gypsum-Perlite 100:2!/i Thickness Fire Roting Reference Sound Transmission Loss & Reference Vi" 45 min. (1) A 1.1 (1) Vi" 1 hr. (1) 41.1 (21 Vi 1 hr. (1) 41.1 (2) Vi 1 hr. (11 %* Perforated ROCKLATH nail-on, 2" x 4# studs. 8.0 ' Gypsum-Vermiculite 100:21/3 Vi 1 hr. (1) Perforated ROCKLATH nailed to 2* x 10" wood joists with Vt*" headed noils. Va* sub floor--disphragm of asbestos paper--TAG finished floor. . 6.0 Gypsum-Sond 1:2--1:2 I/2* Same as obove except noils had heod. 6.0 Gypsum-Sand 1:2-- 1:2 Vt" i 3/" Perforated ROCKLATH noiled to 2" x 10* wood joists with yr headed noils (5 per lath per joist). 6.0 Gypsum-Sand 1:2--1:2 Vi" Striplath opplied to joists with Va" nails having Vi" head. W Perforated ROCKLATH nailed to 2" x 10" wood joists with head noils-- 4 per lath per joist. 4.0 Gypsum-Perlite 100:21/2 Gypsum-Vermiculitc 100-2V2 Vi" Vi" %' Plain ROCKLATH nailed to 2' x 10* wood joists with heod nails -- 4 per loth per joist -- 20 go. K hex. wire mesh nailed to joists through lath. | 4.0 Gypsum-Perlite 100:21/% Vi" (1) National Bureau of Standards fiMS 92. CO Fsfimated to be some as plain ROCKLATH with sonded plaster. 30 min. (1) 38006 45 min. (1) 1 hr. (1) 1 hr. (1) 1 hr. (1| l'/j hr. (1) 1 Plaster Base Types--Recommended Stud Spacing-Special Uses Recommended Stud Spacing tor thickness indicated* TYPES SIZES COMMENTS Plain 3/.', Vi* thick 16' x 4B' 16* o.c. 24' o.c. `/i* ROCKLATH is particularly adaptable to nailable steel framing spaced 24* o.c. . Perforated* Vt", Vi" thick 16' x 48' 16' o.c. 24' o.c. Required for higher fire rating Insulating Vi' thick 1 6' x 48' 16* o.c. 24' o.c. Recommended for side walls and top floor ceilings for insulation and os a vapor barrier. Plain Long Length V-edge w Vi* thick 24* wide by ceiling height up to 12'. Insulating Long Length Square Edge J/i* thick 24* wide by ceiling heights up to 12'. For constructing 2* Solid . . and 4* long length ROCKLATH and plaster partitions. (Seo pages 62, and 70) For application to exterior masonry walls using USG wall Furring brackets and *A* channels. (See page 65.) ^Perforated ROCKLATH is not recommended for ceiling applications when side-suspension dip attachments are used. FIG. 1. (Ashlar pattern) Sidewall and Ceiling Application Apply 16 x 48 in. ROCKLATH with stag gered end joints on studs or joists, spaced 16 in. o.c. Apply 4 nails per board per support -- space approximately 5 in. apart, V% in. from edges and ends. B3006 0753 30006 0754 15 Long Length ROCKLATI! pl;iK(cr base } in. thick, 21 in. wide wilh V edges is used to construct 2 in. Solid Rock i.ath mid plaster partitions ;ind <1 in. l.ong Length kiKKi.Aiu parti I ions. (.See p<nys 62, mill 70). Long Length Insulating R(>i ki.aiii, 2h in. thick, is used as an economical furring application for exterior masonry walls, providing ease of erection, insulation and an excellent vapor harrier (.See page eS5). ADVANTAGES The same lire protection as other Rocki.atii plaster liases of corre sponding thickness, as well as econ omy and ease of application. of ROCKLATH Proper Nails--For '}. jj in. Riicki.A hi, nails should lie l*5j in., Id gauge Lined, 'Vi in. flat head, smooth dia mond point. I''or } 2 in. lath, u.-w 1' [ in. length. For nailahlc steel fram ing (spaced not more than 21 in. o.c.) use nails of proper gauge with not less than 's in. heads and long enough to develop the proper nail holding of the framing. Nailing (Sidewalls and ceilings) -- Spare nails approximately 2a in. from the edges and ends, approx imately 5 in. apart, using four nails per lath per support. For ! 2 in. Rhcki.A) n with supports more than 10 in. o.c., nails must he spared ap proximately 4 in. apart using 5 nails per lath per support. For a one hour ceiling lire rating when using sand as the aggregate, 5 nails per lath per support plus slriplalh on joints must lie used. Sidewall and Ceiling Application-- RoCKI.AIII plaster hasc should al ways he applied (ace mil with the long dimensions at right angles to the framing members. On walls, the end joints should be made to fall on different supports in alternate courses. On ceilings, end joints arc staggered as for side walls (See Fig. r), or the Rocki.atii should be erected so that the end joints arc made continuous on a support, in which case the end joints must he covered with .1 in. slriplalh and the long or edge joint olTscL or staggered (See Fig. 2). In all cases, Rock lath joints should he butted together. Cornerite and Corner Bead Appli cation--All inside corners should be reinforced over the Rocki.atii plas ter base with cornerite. Staple or nail cornerite to retain position until secured by the plaster. Apply corner bead to all exterior corners by nail ing through in the framing, or by stapling llangcs firmly to Rocklatii. 16 BB006 0755 and Other Masonry Plaster Bases PYROBAR Gypsum Partition Tile -- A precast gypsum tile for building non load hearing fireproof partitions, either in new construction or alteration work. Uccausc it is made of gypsum, it has a strong natural bond with gypsum basccoat plaster. Pykouau is avail able in several types and thicknesses (Sec chart, page 10). ADVANTAGES Fireproof--.1 in. hollow Pykoiiak plastered two sides has 3 hour tire rating. 4 in. hollow Pykoiiak plas tered two sides has 4 hour lire rating, lightweight--30 to 50';,'; lighter than other commonly used masonry units. Plaster Bond--safety factor of 173. Saves Plaster--large size, machine molded units lay accurately. kef|iiirc 20',j less plaster, as ground.-, arc j 2 in. instead of in. or ;'| in. as wilh other masonry partitions. Sound Resistant--3 in. hollow Pykobar plastered two sides has a sound transmission loss rating of 39.2 deci bels. 4 in. hollow Pykoiiak plastered two sides has rating of 42.X decibels. Economical--low material cost . . . goes up fast . . . fewer joints, saves up to 20% of plaster and up to 40% of mortar . . . easy to cut, less waste. LIMITATIONS OF USE 1. Do not use Pvuwbak for load hearing construction. 2. Portland cement and lime mor tars (Id not bond adequately with Pykoiiak. Use Red 'fop Partition Tile Cement. 3. Do not use portland cement or lime plasters over Pyrouar. Use Rkd Tot' Cement Plaster, before applying portland cement bedding (or ceramic tile, nail or staple metal lath to Pykoiiak. Other types of masonry, such as strut lurid day tile also may be used as backing for ceramic tile. 4. Do not use as a base, or starter course, where there will be excessive water or moisture. Use clay tile or cement block. DIRECTIONS FOR ERECTING Mortar Requirements: use kr.n lot' Partition Tile Cement. Mix I part cement with 3 parts sand by weight. Mortar must nal he relcmpercd. 17 BR006 0756 LINTEL SCHEDULE: i Erection: after ilnnr bucks :irc erected iiihI rough plumbing and wiring me in place, lay llit- first course, with one linles horizontally, by bedding in mortar In :i (me and sliaight line. I .ay succeeding courses in approxi mately ) / in. thick mortar licds, uni formly level in each course, and willi vertical joints staggered. Cut all joints llusli. Anchor partitions to intersecting masonry walls 12) in. o. c. vertically, with corrugated wall lies or I6d or 2!)d cut nails in mortar joints. Wedge tightly at ceiling and slush all chinks and crevices full with moi tar. Anchor wood door bucks to the I'ykuiiak, laid in the mortar joints, with I6d cut nails or three Imck ties each side (approximately 12 in. from top and bottom and at center). Jackarch or lintel construction (Sectibtnr) should be held about ) s in. above head of buck and not slushed with mortar. Anchor steel door frames with proper lies, minimum of three each side (approximately 12 in. from lop and bottom and at center), in mortar joints and slush space between tile and hollow frame with mortar. APPLICATION OF BASECOAT PLASTER Apply Rt;t) Tor Cement Piaster proportioned 3 to 4 parts of sand by weight or .1 to 4 cu. ft. lightweight aggregate per KM) lbs. plaster. (.See frW 31-) 18 BR006 0757 Ollier Masonry Bases Clay Tile and Brick--materials pro duced by exposing a clay putty to extreme heal until hardening has taken place. Clay tile is produced in 12 x 12 in. size in thicknesses usually 2 to 0 in. with scored faces. Concrete Block--precast in molds using a slurry composed of cemen titious materials and an aggregate. It is generally produced in S x Hi in. si/.c in thicknesses usually d to 12 in. and must have rough, porous faces. Such units must be properly cured to minimize volume changes during and subsequent to plastering. These masonry plaster bases arcavailable in units for conslrm ling interior bearing and mm loadbear ing partitions and should be used as a backup for ceramic tile, (erra/zo and cement bases. Portland cementlime sand mortar is generally used for laying up, although RkI) Top Partition "life Cement can lie used* where construction will not be ex posed to undue wetting. They arc .10-5(1',',' heavier in weight than Pykohar Partition Tile, and thickness (or thickness, have a lower fire resistance rating. (ivpsiim plaster may be applied di rect to these units providing the surfac e is porous to develop proper suction or scored to develop ade quate mechanical bond with plaster. Monolithic Concrete--many class A multiple story fireproof buildings are constructed of [mured rein forced concrete. Frequently, specifi cations require application of plaster basecoats direct to the concrete. It is important, in order to secure proper bond between the concrete and gypsum plaster, that specifica tions for this particular application be slriilly adhered to. (.Sec /mgr .?.S`.) PYROBAR Partition Tile Data 2x1 2x30 in. solid 3x1 2x30 in. hollow 4x12x30 in. hollow 6x12x30 in. hollow 10 ft. 13 ft. 17 ft. 30 ft. 10 lbs. 10 lbs. *8 Vi lbs. 14 lbs. *12 lbs. 20 lbs. 500 lbs. 700 lbs. 900 lbs. 1300 lbs. *Available only in areas serviced by U.S.G. mills producing Ibis weight life. 33 006 0758 19 Fiber Insulating Plaster Base A In(li manufactured in size x IS x -18 in. from wood lilicrs which ;irc felted together to produce a strong, rigid sheet having high thermal insu lation value. ADVANTAGES Easy to Handle--rigid, lightweight and easily applied to Muds or joists spaced not more than IP in. o. c. Excellent Insulation -- "k-fartor" is ..1.5 Itlu. Saves approximately 2 1% of heat normally lost through unin sulated exterior walls and lop lloor ceilings. Superior Bond -- with gypsum plas ter. Sound Resistance--when used on liolli sides of a wood stud partition and plastered with gypsum plaster, is approximately ei|iial to -1 in. hol low clay tile partition, plastered both sides. LIMITATIONS OF USE 1. Apply only gypsum plaster liasecoals to Wkatiikkwooii. Portland cement and lime mortars do not bond properly. 2. It is not recommended to receive vermiculite aggregate plaster. 3. A full J % in. plaster thickness is necessary. 4. Should not be used where exposed to excessive moisture or humidity. LATHING DIRECTIONS Apply Wka nii:kwood Plaster Base with the long dimension at right angles to the framing members, butted with staggered vertical joints. Joints between walls and ceilings should be staggered so that vertical joints on walls will not meet ceiling joints. Use regular 1J,r in. blued lath nails; space nails approximately I in. apart, using .S nails per sup|xirl. Center end joints on framing mem bers. Cut accurately and fit lath neatly a round all electric outlet boxes, etc. Reinforce all interior angles with corncrile. Fasten the cornerilc only sufficiently to retain its position until secured by the plaster. Apply corner bead to all exterior angles by nailing through to framing. PLASTERING See page .11, llasecoat Plaster Appli cation, for plastering directions. 20 BB006 0759 USG COLOR-RIGHT METAL LATH USG Coldk-Ritb Metal l.alh i~ rustresisling copper alloy sheet steel, -lit and expanded to form a multitude of small mesh openings. It is further protected by dipping the expanded sheet into black asphallum paint, (exception: 3.4 lb. diamond mesh when made from galvanized sheets.) ADVANTAGES OF USG COLOR-RITE METAL LATH 1. Strength and Reinforcing -- Metal lath embedded within the plas ter provides tensile strength in a manner similar to steel reinforcement in concrete slabs, thus providing high resistance to transverse impact. It decreases the hazards of serious cracks and failures due to structural movement of the frame. 2. Flexible--Readily shaped to or namental contours to a degree not possible with other plaster bases. 3. Quality Plastering--It makes the use of over-aggregated plaster in the scratch coal impractical. 4. Economy--Intended for highest ((Utility, lire resistant, durable plas tering with low maintenance costs. 5. Fire Resistance--Metal lath anil gypsum plaster provide high lire ratings. USG COLOR MARKING SYSTEM UStl I'of.oK-Rm: Metal bath is the newest development in the metal lath industry. Knds of bundles arc spray painted ml for all 3.1 lb. lath, white for 2 3 lb. diamond mesh and 2.75 lb. ! s" riblath, blue for 4.0 lb. '} H" riblath. This makes warehousing, inventory and job distribution easier and positive. An architect may f|iiickly anil visually inspect a job to make sure the weight lath he speci fied is used. When the lather erects the colored end to the right as we recommend, the plasterer saves up to 25 percent of the scratch coat; saves time and effort because of the uniform "drag" on his trowel since all sheets lay in the same direction. 21 BB006 0760 roipuia.srsi ,. 11 USG COLOR-RITE Diamond Weights: 2.5 lbs. (End Painted Mesh Lath Size: 27 in. x 96 in. White) and 3-4 lbs. (End Painted Red) per square yard. Galvanized A small mesh (approximately 11,000 meshoi per yard) diamond pattern metal plastering base. available in 3.4 lb. weight only. Limitations of Use--Specify A general all purpose lath. Best for orna mental, contour plastering. The small "self-furring" for use as stucco base and 3.4 lb. galvanized where meshes conserve plaster ond reduce drop pings. additional corrosion resistance is required. i- I fy \ *- Stiffening ribs and herringbone pattern increase rigidity, thus per ft: 1M mitting a wider spacing of sup ports or a saving in the weight of lath required. Particularly suitable o for attachment by nailing. Smoll m USG COLOR-RITE 1/8 in. meshes conserve plaster materials. ' Weights: 2.75 lbs. (End Painted Riblath (Flat Riblath) White) and 3.4 lbs. (End Painted Size: 24 in. x 96 in. Red) per square yard. A herringbone mesh pattern, with V* In. deep Z-shaped ribs running lengthwise of the sheet of 1 Vi in. intervals. Limitations of Use--Its rigidity makes it unsuitable for contour lathing. Use Diamond Mesh. USG COLOR-RITE 3/8 in. Riblath Size: 24 in. x 96 in. A herringbone pattern mash with V% In. deep V-shaped ribs running lengthwise of the sheet of 8 fn. Infervolt, with inverted Intermediate Vt In. ribs. The heavy ribs provide exceptional rigid ity. Used when supports ore spaced mort than 16 In. o.c. and not more than 24 in. o.c. Desirable os a plaster base for heavy duly plastering. Used as centering and reinforcement for concrete floor and roof slabs. Weights: 3.4 lbs. (End Painted Red) ond 4.0 lbs. (End Painted Blue) per yard. Limitations of Use--Its extreme rigidity makes Vt in. Rib-loth un suitable for contour lathing. Use Diamond Mesh Lath. USG COLOR-RITE 4-Mesh Z-Riblath Size: 27 in, x 96 in. A "flat rib" lyp. at lath with tmall.r m.th opening.. An .xc.ll.nt nail-on lath, or for Ha-on work on flat celling.. Weights: 2.75 lbs. (End Painted White) and 3.4 lbs. (End Painted Red) per square yard. Limitations of Use--Use Dia mond Mesh lath for contour plas tering. ;. *. 22 i i____________________ B8006 0761 ' ' ' '-'t ' 1 ' i .. .. r .1t j;.|V 38006 0762 23 `.MHiinni __ i STRUCTURAL AND TRIM ACCLSSORIES To* In order In assure a quality jol) throughout, USCi offers a complete line of accessories. All beads, liase screeds and picture mould made from 2fi gauge galvanized steel. 1-A Expanded Corner Bead--Its wide expanded linages are easily flexed. Preferred for irregular cor ners. Provides increased reinforce ment close to nose of liead. 4-A Flexible Corner Bead --The general purpose corner liead. I'.conomical and most generally used, liy snipping flanges, this head may he lient to anv curved design (for arch il ays, telephone niches, etc.). 5-A Bull Nose Corner Bead --A ?.i in. radius hull nose head with short (langc. I'sed for rounded Cor ners. Can he secured to comers with No. '(-A ( oi ner Head ( lips at ladled to linages, where w ide nailing linages are required. 10-A Expanded Bull Nose Corner Bead -A hull nose head similar to above, hut with 21 j in. wide ex panded linages. Kspecially suitable on irregular corners. 3-A Expanded Wing Base Screed-- A Hush type ) '> in. ground with'wide Hcxible expanded linages lor added reinforcement or for attachment to uneven surfaces. Used as a dividing point between plastered surfaces and Portland cement or terraz/.n. 6-A Plain Base Screed--A Hush type )i in. ground (job shimmed for i t in. grounds), used at the juncture of differing finishes; as between plas ter and terrazzo surfaces. 7-A Curved Point Base Screed -- Unr use where base or wainscot is to project beyond the plastered surface. Made for Jj in. plaster ground (.job 24 TT taw uipjinr-iv 83006 0763 JiUliWIlM mfWIOTif Hfmrm t shimmed for it in. grounds) with in. projection for base or wainscot. 8-A Picture Mould -- A concealed * mould. Attached In lath and plas tered Hush to the slotted opening, (rounds 1 > in. (job shimmed for \\ in. grounds). USG 2 in. Partition Terminal - A terminal for use as a partition cap and plaster ground in 2 in. solid plaster partitions with either metal lath or Kiii'ki .1 l it plaster base. Cap is formed of IS gauge steel, welded to 24 gauge punched runner assem bly prime mated. Length S It. 2 in. Lathing Channels - Strong, light weight channel sections used lor fur ring. suspended ceilings, partitions, etc. Sizes: :l i in. or 1' in. deep, Hi ft. or 2H ft. lengths. Weights: ' t in. At If) Ills, per M bin. It., 11 in., 175 lbs. pel M l.in. I'l. Madeol 16 gauge steel, black a.-phallum painted. USG Selv-Edge Cornerite and Striplath - Cornerite is a I in. or (t in. wide stiip of 2.5 lb. copper alloy painted diamond mesh lath, bent to form a Hilt" angle, length *Wi in. Mriplulh is a 5 in., 1 in. or (> in. wide strip of 2,5 lb. diamond mesh lat It, copper alloy, pain ted, ')<> in. long. Metal Door and Window Casing Beads Used as a plaster slop and ground at window and door open ings, eliminating wood trim. Available in expanded llange in No. -I, (Quarter round. No. HO. Semi square and No. (>h, Square, 1 /' and i'i" grounds only; in short llange, No. I5S, Ouartcr round, No. (id, Semi-square, No. (><> Square, in ) >" H" and 7ti" grounds. All casings furnished in T, 8' and ID' lengths. No. 4 and No. 158 made Irom 21 gauge and No. bit and No. tifi Irom 21 gauge galvanized steel. ifl r.1-1 33006 0766 25 APPLICATION of METAL LATH IMPORTANT Observe (lie minimum weights of lath for spacing of supports listed in tallies at 1 lie end of this section. Use only dean sand, perlite or verniieulilc for plastering. Do not use un washed salt water sand. When humidity is higher than normal and moisture or acid fumes are antici pated, contact your nearest IJStl Sales Office for proper recommen dations. Ilov; lo I.incl COI OR RIIE MCIAL I.AIII 1. I.alli ceilings first with sheets carried down six inches on to the walls and partitions. If metal lath is not used on the ceiling, then carry out metal lath six inches from the walls onto the ceiling joists. 2. Apply metal lath with long di mension of the sheet tunning across the studs, joists or furring channels. Secure sheets hv nailing or stapling along studs or joists and ticing lo channels at not more than six inch intervals. 3. On sidewalls, begin lathing at top and continue downward. Place sheets so that the lower sheet laps over the upper sheet. Diamond niesli lath is carried around corners at least one stud spacing. ERECTION DATA Sj.fi Typi at Steel 4. Kihlnlh on both sidewalls anil ceilings is applied with ribs against the supports. 5. Lap diamond mesh at sides not less than ] in. and at ends not less than 1 in. Kiblnth is lapped at sides by nesting outside ribs, and at ends by lapping not less than I in. 6. Tic all side laps with IS gauge tic wire at least midway between joist or stud supports, but at not more than 9 in. intervals. 7. Knds of sheets generally should occur over supports; if between, ends of sheets must be securely laced together with IS gauge lie wire. 8. Staggering of sheets i- preferred, but not essential. Ilmv lo Mail COLOR-RUE MEIAL LATH DIAMOND MESH and FIAT RIBLATH On walls--Id common nails driven j j in. and bent to engage three strands, or I in. L,, in. head rooting nails, or I in. Xo. II wire staples. On ceilings -- I J in. No. II gauge, fir, in. head barbed roofing nails. V, IN. RIBLATH On walls--Id common iiniN driven through the rib or fid common nails driven ;i j in. and bent oxer the rib. On ceilings -- 11 > in. N'o. II gauge ` ,i- in. head barbed roofing nail driven through the rib. Lathing nails- for Ifi in. stud spacing, nailing t> in. o.c. rc<|ttires approximately 17 nails per si|. yd. Site < Sheets MAXIMUM AILOWABLE SPACINGS VERTICAL SUPPORTS METAL_______________ HORIZONTAL SUPPORTS ' ' a , Hbflj) Blftert Wai(J j j; aH|llbhl , (5) : WoocUr Concrete . Metal I Diamond Mesh Diamond Mesh Diamond Mesh Z-Rib Z-Rib W Rib V." Rib STUCCOMESH STUCCOMESH 2.5 lb. 3.4 lb. 3.4 lb. 2.75 lb. 3.4 lb. 3.4 lb. 4.0 lb. 1.8 lb. 3.6 lb. Copper Alloy (1) Copper Alloy Galvanized (2) Copper Alloy Copper Alloy Copper Alloy Copper Alloy Copper Alloy Copper Alloy 27' x 96' 27' x 96' j 27' x 96' \pm x 96' 27' x 96' ,24' x 96' :,24' x 96' i*>t{' 48' x 99' ,48' x 99' 16' 16' 16' 16' 19' 24' 24' 16' (3) 16' (3) 16' 16' 16' 16' 24' 24' 24' 12' 16' 16' 16' 19' 24' 24' (4) 16' 16' 16' 19' 24' 24' (41 13 '/j' 1 3'/j ' 12' 19* 24' (6) 24' Notes (U Copper alloy fcilh contains from 0.2% to 0.25% pure copper. (2) Galvanized lath is cut from galvanized sheets. (3) STUCCOMESH generally applied over exterior sheathing. 26 M 08006 0765 All metal loth (except galvanized) it painted with a rust-inhibifive black atpbohwm paint. (4) Not recommended, except for fireproofing of steel shapes. (5) Including vertical furring. (6) ASA recommends 19 inch centers. * 38006 0766 27 N.iil U.Un Large Headed Barbed Roofing Nails 7/u> in. head Common Nails Length l in. 1 Vi in. 4d 6d Gauge No. 1 1 No. 1 1 No. 1 2'/i No. 1 1 Vi No. per lb. 275 188 316 181 Iio lJp Wotk lor tying met ill lull to channels use IS gauge galvanized annealed tic wire, lor tyinn channels to channels (horizontal or vertical construction) use I strands of IS gauge or 2 strands of 10 gauge galvanized an nealed lie wire. (Types and weights of Metal l.iitli, and Spacing of Su|>|iorls) l.sliiudliiir, (judiililmr, For Suspended Ceilings--The fol lowing "rule of thmnli" method will he found helpful in making a quick approximate quantity estimate. 1. Ilelermine surfac e area in squaie feel. Kxamplc: ceiling area ft) x 100 feel = 2,000 square feet. Divide by 0 to determine square yards of metal lath required. Assume standard suspended ceiling construction of \\<i in. runner chan nels I feel apart, and ) ( in. furring channels cither 12 in. or 10 in. apart, depending on type and weight of metal lath used. 2. Oiiantily of 11 > in. channels 4 feet apart -divide square foot area hv 2('2 (2,000 divided by 3)-2 = 860 lineal feel) 3. Oiiantily of ( in. channels 12 in. apart -- multiply square foot area by 1.1. (2,000 x 1.1=2,200 lineal feet) 4. (Juanlily of in. channels 16 in. apart--multiply square foot area by 0,<S. (2,000 x 0.8 = 2,400 lineal feet) 5. Figure lie wire at approximately 10 pounds per 100 square yards of lathing. mm Ceiling Height Lineal Feet of Ceiling Member Required 7 It. 8 (I. 9 ft. 10 ft. 1 1 ft. 1 27 ft. 113 ft. 100 ft. 90 ft. 82 ft. lath one side--100 tq. ydt. lath two tides--200 jq. yds. Lin. Ft. of Floor Member Required 127 ft. 11 3 ft. 100 ft. 90 ft. 82 ft. With Approx. > ' ' Spacing Lineal Feet of of Studs j; Studs Required 12 In. ` 912 ft. ' 16 in. ... 690 ft. q. 19 in. i ` 590 ft. ifi o 24 in. . 460 ft. \ t i I'! i ') ,1 f I i i I I Basecoat Plasters RED TOP Gypsum Basecoat Plasters Aggregates Mixing--Application Important Job Precautions RED TOP Cement Plaster RED TOP Sanded Plaster RED TOP Wood Fiber Plaster RED TOP BONDCRETE Plaster RED TOP STRUCTO-IITE Plaster Portland Cement Plasters PAGE 30 36 37 37 38 39 39 basecoat plasters arc applied to bases of masonry or lath and support the finish coat. Their primary functions are to cover the base, receive the finish coat, and tic together all units into a durable continuous slab. Of the three general types of basecoat plasters, gypsum plas ter is by far the most modern and widely used. Portland cement plaster excels for a few specialized uses, while lime plasters-- very limited in use--have been largely replaced by gypsum and Portland cement. trrrr 3B006 0768 .yiww mu 29 RED TOP Gypsum Basecoat Plasters ADVANTAGES Uniform--Milling lime is stabilized. Hazards tint- (<i joli conditions .'mil variables in water anil aggregates are minimized. ('milrnlled sel asmiic. maximum hardness and high tensile strength. Fireproof--fr\|>sum is inrnmbuslihle, will nut transmit Ini'll tempera tures until completely ealeined. It actually lights lire lie rclaidiiig spread nf llatne. Plastic--gypsum base emits arc highly wurkalile and easy In apply. Strong--capable nl willislanding iinmial wear and abuse (nr the life time n( the building. Adaptable--gypsum bunds lirmly to any approved plaster base and will lake any type uf linisli eoal. Economical -- high coverage with minimum effort. I'.asily worked and mixed. GENERAL LIMITATIONS OF USE 1. Aggregate must be added strielly according to specifications. Use of luo mill'll aggregate reduces the strength of (lie plaster slab. 2. Ui'.D Toe Cement, Sanded, Si rurlo-l.ile or Wood fiber I'tasters should never la: applied to concrete. Use Uoniickkti'. or Cover Coal as re<|uircd according to directions. 3. Kki> Tin1 Piasters should not lie used on exteriors exposed to the clc- mcnls, or on interiors where exces sive water or moisture is expected. l>e Portland cement-lime plaster. 4. bituminous compounds do not provide a good base for gypsum plaster basecoals. Therefore, do not apply such plasters to masonry walls and concrete that have been treated with these compounds. 5. because of possible moisture con densation or water seepage, direct plastering to the inside of exterior masonry walls is not recommended. Such walls should be furred prior to plastering. 6. W hen used in conjunction with Kadi,lilt Healing systems, the tem perature at the surface of plaster shall not exceed 115 !', nor shall water in the pipes embedded in the plaster exceed 125 l\ (iypsum-sand plaster has approximately three limes the conductivity of gypstinilighlweight aggregate plasters. Aggiegatcs Aggregates in the form of sand--and more recently, perlite and vermiculilc --arc added to gypsum cement plasters to extend coverage and re duce cost. They also act as a gauging agent to minimize shrinking of gyp sum in setting. The proper use and proportioning of aggregates with gypsum plaster determine the ultimate strength and 30 8R006 0769 hardness of a plastered wall. Typical compressive and tensile strengths that result with use of sand and lightweight aggregates (perlite, vermiculite) in varying plaster mixes arc shown in the following chart: The American Society for Testing Mate rials in ASTM Designation C35-39 has established the following specifications which ore regarded os slondard for the proper gradation of good plaster ing sand: Percentage of Sand Retained Size of Sieve Max. Min. No. 4 (4760-micron) No. 8 (2380-micron) No. 30 (590-micron) No. 50 (297-micron) No. 100(149-micron) 0 10 80 95 -- -- 0 15 70 95 The amount of material finer than a No. 200 (74 micron) sieve sholl not exceed 5%. SAND Sand is the most commonly used plaster aggregate because it is eco nomical and widely available. Proper proportioning and gradation of sand arc most important in determining bulk and working qualities of plaster, ami the ultimate quality of the fin ished wall. Over-sanding or the use of an excessive amount of fine sand reduces the strength and hardness of gypsum plasters. VERMICULITE is mined as a mica rock, ground and expanded under heat into light weight granules for use as a plaster aggre gate. It should weigh between 7.! lbs. and It) Ills, per cubic fool and comply in gradation with ASTM specification for sand. (.Sit Miw.) Walls plastered with gypsum plas ter containing vermiculilc as an ag gregate have lower strength and re- Recommended Proportioning & Coverage Gypsum Cement P'laster (weight) Gypsum Cement Plaster (100 lbs.) Sand (weight) r Perlite or Vermiculite (cu. ft.) Plaster Base Gypsum Insulati on Metal Lath Lath Lath Brick-Clay Gypsum Tile Tile Two Coot Work Scratch-Double Back l:2'/z -- -- 1:3 1:3 to to 1:4 1:4 Three Cool Work Scratch Coat 1:2 1:2 1:2 -- -- Brown Coal 1:3 1:3 1:3 --- Coverage Ronge Sq. Yds. Per Ton 175-220 175-220 90-125 175-200 200-240 Note: Vermiculale Aggregate is not recommended for use over fiber insulation lath. '111 1 88006 0770 31 ; i i ' 93006 0771 Relative Strength of Various Plaster Mixes ;; f , |; Mix Comprewiv* Strength lb*, per q. inch. Neat 2 cw. fl. 3 cu. it. 2 cu. ft. 3 cu. ft. 2600 2100 1200 750 500 300 1000 650 Tamila Strength . lbs. per sq. inch. ' 440 245 170 120 130 90 165 105 When the proper amount of aggregate has been used, each grain of aggregate is cemented on all sides to its neighbors by the gypsum. When the proportion of aggregate to plaster is excessive, the aggregate is not properly cemented. See illustrations below. c|tiire a longer period for drying than walls of sanded plaster, but arc lighter in weight and have greater lire resistance. Where hard finish coats (Kccncs cement) are to be used, reduce the pro|w>rlion of vcrmiculite to gypsum plaster in the basecoat. Ycrmii ulilc is proportioned with gypsum plaster on a volume of aggregate to weight of plaster basis, and strict compli ance with the table on Page 31. PERLITE Perlite is a relatively new lightweight plaster aggregate produced from a volcanic rock. The perlite ore is ground and screened to proper size, then expanded to produce a light grey or white colored aggregate. Perlite aggregate (or plastering should weigh between 7Y2 and 15 lbs. per cubic foot. It should meet ASTM C35-39 gradation requirements ex cept that the minimum percentage PROPER AMOUNT Of AGGREGATE EXCESSIVE AGGREGATE 32 1I I1 iut smuyirrcTCTffvir retained on a No. 100 sieve shall be decreased from 95 to 90 percent. It lias excellent fire-resisting qualities and when mixed with gypsum plas ter it provides a higher strength plastered wall than docs vcrmiculite. (See comparative strengths of vari ous basecoat plasters, page 32.) Perlile is added to gypsum plaster on a volume of perlile to weight of plaster and should be proportioned in accordance with the same specifi cations as for vcrmiculite. Note: See precautions, page 5-1, if perlite or vcrmiculite aggregate is to be used with plaster on radiant heating jobs. WATER All gypsum plasters require the addi tion of water on the job. Water pro vides lubrication and workability to permit application to the plaster base. It also induces the proper set ting of gypsum. As a general rule, any water fit to drink is suitable for mixing with plaster. or more than 3, depending on the speed of the mixer. Dump the entire batch at once. Clean the mixer thor oughly when not in use or continuous operation. Box Mixing--dry mix plaster and aggregate together until completely blended. Add water, and hoe plaster into the water until thoroughly mixed to proper consistency. PLASTER GROUNDS AND THICKNESS To attain proper wall strength it is essential that the plaster slab be applied to the proper thickness. This is controlled by the use of grounds. Grounds should be set to provide a minimum plaster thickness of: (a) Yi inch over gypsum lath, fiber insulation lath and gypsum partition tile; (b) inch over brick, clay tile or other masonry, (c) over metal lath when measured from the face of the lath, to provide a total mini mum thickness of ;* j in. MIXING Gypsum basecoat plasters may be machine or hand mixed. The former is preferred because it disperses the plaster, the aggregate and the water more evenly. Machine Mixing--place the required water in the mixer. Add approxi mately half the required aggregate. Add all the plaster. Add the balance of the aggregate, if necessary add more water to obtain the proper con sistency. Mix not less than 1 minute cO O o O' o -si -si fsJ 33 nmcirnr 7't twijwinwirjjuir APPLICATION of RED TOP PLASTERS Clustering specifications may require either two-coat or tlircc-coat work. Two-Coat Work consists of one liase coat and one finish coat. It is gen erally used over a masonry plaster Case and often over gypsum lath. The liasecoat plaster is applied in one coat by either thc"single-foot"or tlie"scratcli-dnuhle hack"method to slightly less than the thickness of the grounds. It is redded and darhied to a true, even surface left rough enough to take the hnisli mat. Three-Coat Work consists of two separate Irase coats and a finish coal. Three coats are rcr|uiml over filter insulating or metal lath. The hist or '`scratch" coal properly aggregated is applied to a thickness of approxi mately 1 |' inch over the face of the lath and then cross raked before it sets. This provides .'t mechanical key for the brown coat. The brown coat is then applied direcllx to the set scratch coal. The brown emit is used to III) out to just slightly below the grounds and is toclded and darhied to a true, even surface. It is left rough enough to properly receive the finish coal. IMPORTANT JOB PRECAUTIONS 1.Equipment and Storage of Ma terials--All successful plaster jobs require adequate equipment (mottar boxes, mortar boards, sc.illolding and tools). F.vcry job should be properly planned to provide .ample sea Holding to permit continuous application of both liasecoat and finish plasters for a complete panel of either a wall or ceiling. Keep all mixing tools clean. Wash them in clear water only. Keep plaster stored in a dry location.Stack on planks raised ofT the ground and awav from damp walls or floors. 2. Heating--Plaster must not be applied to surfaces that contain frost. A minimum temperature of 55 ('. should be maintained in the building for an adequate period prior to, dur ing and after the application of the plaster. In cold, damp or rainy weather, properly regulated heat should he provided, hut precautions must be taken against too rapid drying before set lias occurred. This avoids "dry outs." 3. Ventilation--As soon as tlie plas ter has set, free circulation of air should be provided to avoid "sweat outs." After plaster lias set, heating should be continued to insure as rapid dn iug as possible. In hot, dry weather, protect lire plaster from wind, and from drying unevenly or too rapidly before set Iras takeir place. If gla/.ed sash are not in posi tion, exterior openings iit lire build ing should be screened with cheese cloth nr similar material. 4. Finishing Over Lightweight Aggregate Basecoats--`I he use of lightweight aggregates (perlite and BB006 0773 34 r WNi'IITT'Bfai vcrmiculitc) with gypsum bascronl plasters often results in a liasecoat having a high suction (because of higher porosity). In applying a finish coat over this high suction base, the water in the finish coat is quickly sucked into the thirsty liasecoat making application of finish extreme ly difficult, due to loss of easy w orking characteristics of the finish plaster. Furthermore the finish coat is some times susceptible to severe check cracking, because water is sucked out before ganging plaster is >et -- thereby nullifying purpose of llie gauging plaster (provide initial set to avoid possible shrinkage of the lime-putty finish). Necessary precautions should be taken to apply finish coal pla-ter before the liasecoat becomes thor oughly dry. When a liasecoat has become bone dry, before finishing, spray lightly with water to eliminate the excessive suction of the liasecoat, then apply finish coat. 5. Radiant Heating--The (lypsum Association makes the following rec ommendations when radiant heal ing coils are specified for use in a ceiling or arc to be embedded in the plaster slab. a. In all radiant panel heating sys tems where gypsum plaster or gyp sum products arc concerned, the surface temperature shall not exceed 115 degrees I'. In those systems where pipes are embedded in gypsum plaster, this shall be met by requir ing the water temperature in the pipes in contact with the plaster not to exceed 125 degrees F. < (A nte: This is in agreement with the maximum snrfme temperatures listed in the ASH \ 'T. Guide whith /hive i'wen established from it earn/art standpoint.) b. The temperature of the gypsum plaster shall not exceed 90 degrees F. or atmospheric temperature, which ever is greater, until the plaster has set and i- thoroughly dry. c. W here heating elements are em bedded in gypsum pla-lcr, a mini mum cover of:) s* shall Ire maintained over lire coils. d. In radiant panel beating systems where the pipes arc to be embedded in plaster applied to metal lath or gypsum lath, these pipes shall be supported by the /mining and not by the lath alone. e. (iypsum pla-lcr, when used with radiant panel beating systems, shall be mixed and applied in accordance with the ASA A-12.1 "Standard Spin ilicnlinns for (!yp-um Plastering." Tire design of a radiant panel beat ing system is the tesponsihilil v of a heating engineer, and the lathing and plastering spci ilicntinns must be established bv the designer. There fore, lightweight aggregates (ver- miculitc and perlite) or mill mixed plasters incorporating them (Sirue- tolite), should not be used unless the heating engineer, healing contractor or architect have designed the heat ing system for their use, as light weight aggregates oiler greater re sistance to the llorv of heat than plasters mixed with sand. Kadianl healing coils should not BB006 0774 ^ T TT be used lo heat the building or dry the plaster slab in which they arc embedded. The heating system should only be turned on .and brought up lo operating temperatures very slowly after the plaster slab is thoroughly dry. RED I OP Cement Plaster This is a "neat" gypsum plaster which requires the addition of an aggregate (sand, vermiculite, per lite) and water on the job. It is the most common base coat plaster be cause job-addition of aggregate gen erally provides lowest cost. It is used for both scratch and brown coat work, and for application over all approved plaster bases. Rep Tot> Cement Plaster is avail able in three types: unfibered, fibored, and e.xtralibcrcd. It is usually desirable to use extra fibered plaster for scratch coat work on metal lath. It helps hold plaster mortar to lath until set takes place. Unfibered plas ter is suitable for use over all other bases. The use of liber in plaster un doubtedly stems from its use with lime base coat plasters years ago. Lime does not set and requires a long period of time to harden. Conse quently liber was necessary to add cohesiveness to the mass. ADVANTAGES Red Tot' Cement Plaster is fireproof, adaptable, plastic, uniform and strong. It is perhaps the most eco nomical base coat plaster in use today. LIMITATIONS sec general limitations noted on page .TO. Job-addition of aggregates must be in strict accord with gradation and proportioning specifications. 36 H3006 0775 *1 RED TOP Sanded Plaster This is a mill-prepared base coat plaster containing the correct pro portions of well graded plastering sand. It is ready for use with the ad dition of water only. ADVANTAGES particularly adaptable to areas where good plastering sand is not locally available. Avoids possibility of over sanding, or improper gradation, thus assuring proper strength. I'.liminates problem of frozen sand in the winter. LIMITATIONS sec general limitations, page .TO. Cost is somewhat higher than job-sanded Red Tor Cement Plaster. SANDED PLASTER $ _______ SC RED TOP Wood Tiber Plaster This is a mill prepared base coat plaster containing a wood fiber ag gregate and requiring the addition of water only on the job. Over masonry surfaces, one part sand by weight may lie added for easier work ing qualities, and lo minimize shrink age cracks. ADVANTAGES Rep Tor Wood l iber Plaster is rec ommended for use where excessive strength, toughness, or a higher lire rating is required. 11 lias: three times the compressive and tensile strength of plaster sanded 1:1 (see />ugr J'); approximately 50% greater surface hardness; 50 to 100% greater lire rating than plasters containing sand. Highly desirable for use where good plastering sand is not available, and for alteration, patch and repair work. LIMITATIONS see general limitations page 30. 33006 0776 i -i 37 Ki i) mr i;nfiOCRUi. I'Inslcr This is a specially formulated gyp sum base mat |t-r requiring only the ;i l< |i I i< i ii ill water mi I lie job. It i- llic only iceonmicndcd base coal plaster for application In properly |nr|i;iml, null'll monolithic i onmte. CVrSUM PIASTER S fOR CONCRETE | ADVANTAGES n ill ike llorni;il g> p-iini base emit ] il:i<1 < r~, lloMK ni l K Inis thermal expan sion ei|iml In rinurric, wliieli pro vides mnliuuous lioinl to this l\pe sin lin e. LIMITATIONS Iti ini ii ki.ii. should lie used only on rough eonerclr I lull is properly |irepared for pla-leriug. It should never lie applied to sinoolli eoiiercle (nr ('i o kucii \ i, /mgr s ?). Maximum lliiekness ol I'.omin;Kii; and linisli in.it should not umitiI s in. on ceilings, and 's in. on nails. II additional thicknc-s is required, metal lath inusl lie prop erly seemed to the eonerele siirlai cs before applying the plaster. Surface Preparation -- monolithic eonerele stirlnces should be bnisheleaned of all dust, loose particles and other foreign matter. Any lailauee and ellloreseenee should be re moved by washing with ;i If( solu tion of commereial muriatic acid anil water, Grease or form oil should be removed by wiping with naphtha spirits. If surfaces are not rough enough to provide necessary mechanical key, '' XI.O' i \\ lltev should he hacked or linslthammcml; or a dash-coal of port land cement grout composed of I part of cement and 11 2 parIs of lute sand (mixed to a mushy consistency) may he applied. Keep this mat damp for at least 2 days immediately fol lowing application and then allow to dry. before application of ISonii( Ht.it:, the surface should lie evenly dampened to provide proper suction. Application to Concrete Ceilings-- apple coal of IbiMicm: 11:, scratch ing in thoroughly, doubling hack and Idling out to true, even surface left munli by brooming to receive the linisli coal. Application to Walls and Columns - apply a scratch coat of IIoniichki'k. hollow with a brown coat of gypsum plaster (I pari Kt-.n lot' Cement Plaster In not more than .T parts of sand liv weight) troweled into the scratch coat before it has set. bring out to grounds and level to true, even surface using rod and darby. It is then ready to receive the linisli mat. Total thickness of plaster should not exceed 98006 0777 38 RED TOP STRUCTO LITE Plaster This is a mill - prepared ba-e coat plaster using a properly graded and proportioned perlite aggregate. It is ready for use with the addition of witter only on the job. ADVANTAGES controlled proportioning of a prop erly graded and sized perlite aggre gate. Weighs less than half the weight of plaster and sand aggregate. I,ess than half the weight on wall. More fireproof. (lifers lire ratings almost double those attained with plaster and sand. Mill formulation reduces suction to that of plaster and sand, assures easy application of the finish coal. Joh - mixed lightweight aggregates often create considerable suction lor linisli coal work. Stabilized set. LIMITATIONS see general limitations page .1(1. Avail able in limited area only. Con-ult L'.S.G. representative fora vailabilily. bM ,g ItI I> IOP fj siiuiuio-ini. t(| Ml * GYPSUM b E PLASTER c. - ?? Portland Cement Bnsf.* C'bil Piaster I'orllaml eemenl, with the addition of lime to provide working qualities and water resistance, is frequently mixed with sand and water to form a plaster mortar. It is chiclly used as a ba~e mat for exterior stucco and in places subject to excessive moisture, such as swimming pools, showers, dairies and steam moms. It is also used when' an extra hard base coat is de-irablc, and as a back up material for ceramic tile. PORTLAND CEMENT base COAT PLASTER t . .. , 1 LIMITATIONS Portland cement -lime base mat plas ter is comparatively iinplaslic and hard to apply, thus high in cost. It must he kepi damp to propi ily erne and prevent drying out and cracking. Several days delay between coats is necessary to assure proper curing and hardening. Mixing and Application -- Mix scratch coal in the proportion of one hag of porllaml (eluent, two 89 006 0778 39 Imps of Moktasf.ai. or Rki> Top Masons Hydrated Lime (2 cu. ft. Jime putty) and nol more than 7J tj cu. (1. of sand (approximately 45 No. 2 shovels), For application over si mm mesh or self-furring melal lath, approximately two pounds of hair or liher should he added to each mix. Mix brown coal in the proportion of one hag of porlland ceinenl, two hags MoinAsi'.Ai.or K I'.nTop Masons 11ydrilled Lime (2 cu. ft. lime putty) and not more than *t cu. ft. of sand approximately 55 No. 2 shovels). Scratch coat should he applied in a full s in. thickness with sufficient pressure to form a good liond with masonry surface or to force it through and completely cmhed the stucco mesh or metal lath. Cross scratch, and after set, damp cure for not less than 48 hours. ltrown coat should he applied over the dampened scratch coat to a full in. thickness with sullicient pres sure to form good hond. Rod the brown coat level, and broom the sur face to provide key for the finish coat. After set, damp cure at least 48 hours before applying the finish coat. (Sec Oriental Kxlerior Stucco for finish coat, />ugc 47). Curing--damp cure each coat by applying water in a fine fog spray. Apply only as much water as is readily absorbed. The fre<|uency of spraying depends on the weather, with more frequent applications re quired during hot, dry or windy weather. Finishing Plasters Gypsum-Lime Putty Trowel Finish Keene's Cement-lime Putty Gypsum Trowel Finish Gypsum Sand-Float Finish ORIENTAL Interior Finish ORIENTAL Exterior Finish RED TOP Acoustical Plaster SABINITE Acoustical Plaster COVERCOAT Finishing Plaster , 1 PAGE 42 44 45 45 46 47 48 50 52 Finish-coat plasters applied to baseroats (generally of gypsum plaster) provide the surface for final wall or ceiling decoration. They arc cither factory prepared, requiring the addition of water only; or they may he job-mixed by blending lime putty and gauging plaster, or lime putty and Keene's Cement. Finishcoat plasters are normally applied to a thickness of 1 ic. to * in. Finish-coat plasters a re selected according to job requirements: texture, color, hardness, sound absorption and type of base coal. 40 BB006 0779 -s**ii59W5t5Sfl!6Si5!!S?S39WJ| 89006 0780 41 '* iI *:( Finishing Plasters li'/jr.iiiii limn I'111!y I mi:;linr, finish time putty into wluili is blended a gypsum gauging plaster is commonly known ;is "wliilc coal." II is the most widely Used frnisli rout lirrmise of its Hood working cpia lilies, whiteness, economy and ability to take any form of decoration. Usually it is troweled to a smooth hard sur face over a gypsum liase coal. Willi the addition of sand, it is adaptable for sand-lloat finishes. Made from specially selected lime stone rock of high [unity, the most popular finishing limes conic from the dolomilic fields in northwestern Ohio. They have excellent working ([iialilies. There arc three types of finishing limes: (1) (|uicklimc, (2) normal hy drate, and (.1) double hydiatc. I'.aclt requires specific handling in slaking or soaking to produce a good finish ing lime put ly. I inisli Quiul'.limo is usually made from high calcium limestone. It is produced and used in areas where it is noL economical to ship from the Ohio lime liclds. Uuicklime or "hoi" lime re(|uirc.s relatively long periods of slaking with water for complete hydration and to develop the plasticity necessary for easy application. ADVANTAGES economical because of its high putty yield. T.asy working. LIMITATIONS Ucriuircs long slaking period. Unless bandied carefully can cause serious burns in handling. U.S.G. Brand Ri-.n Toe finishing Ouicklime (Texas and Washington), Muiiibil Hydrate Finish Lime generally made from Ohio dolomilic limestone, it is the most widely used today. Although hydrated in manu facture, overnight soaking is still nctessary to develop workability and plasticity. ADVANTAGES economical, uniform, easy working, white and plastic. LIMITATIONS Ifequirc.s overnight soak. Normal Hydrate finish Lime has been used many years for lime-gauging finish ing plaster, giving generally satis factory results. Under conditions of continued high moisture or humidity, further hydration may take place in the wall. The resulting expansion can cause blisters and separation of white coat from base coat. U.S.G. Brands -- (Iranii Tktn: and Is in Toe Dolomilic Hydrate (fieno,a, Ohio); UkijToi' High Calcium Hy drate (Texas). Double IHrate Finish Lime Usually made from Ohio dolomilic limestone. It is over ()1( i hydrated during manufacture which eliminates troubles from delayed hydration, ex pansion and separation in the wall. Upon mixing with water, double hy drate finish lime imiuitliiihly devel ops high plasticity. Thus, overnight soaking is unnecessary. ADVANTAGES Call be mixed with water by band or with mechanical mixer. Keeomes highly plastie light away. La-y working; uniform; white, fliminan troubles from delayed hydration. USG Brand--Ivory Double Hydrated Finishing Lime -- (Genoa, Ohio) -- Lime does not "set" but hardens slowly. It likcwi-o shrinks on drying. Therefore, gaug ing plaster is blended into the lime putty in proper propoiiimi (o pro vide controlled set a ml strength, and to avoid shrinkage cracks when used as a finish coat. GAUGING PI A-.n m Uki Tor C.auging blasters are care fully ground and screened lo just the right particle sixes to make this plas ter rpiick soaking and easy to blend with lime pully. (lypsuin gauging plasters arc avail able in "(|iiick set" and "slow set," making it possible for the mechanic to use the material which best suits him. It makes it unnecessary to add retarder or accelerator for regulating the -cl of (lie finish, t hey are avail able as w hite gauging and lot ill gauging, which is somewhat darker in color. Tor brilliant white Iniishe-, w hite gauging plaster should be used. MIXING & APPLICATION (lunging pla-tcr is added to the lime putty in the proportion of one part of dry gauging to not more Ilian ,( parts of lime pult\- by volume, or one part of dry gauging (n tio| more than 1 part-o| dry hydrated lime by weight. After the gauging plaster is sided into the lime putty ring ami allowed to soak a lew minutes, the materials are tlwrouyjily blended to avoid gaug ing "streaks" and to provide uniform density in the finish ioat. IMPORTANT Careful application and suiVieicnt troweling are essential to prodme a smoiuh ghissy finish. I lie gauged lime putty is applied over a partially dry gypsum ba-e coat. SeraIdi in a thin mat, well ground into the base coal, ami im mediately double baik with a second coat filling imperfection-. (A third or thin `'sweetening coal" is sometimes applied to fill in any further imper fections that remain after the second coat has "taken up.") After the base coat has sucked most of the excess water from the finish, it is troweled to densify the surface and help eliminate check cracks. As final set takes place, it is water troweled thoroughly to pro vide a dense, smooth surface suitable for decoration. 42 98006 0781 99006 0782 43 TOWW! !jWWWuPwisr i' Kmmr;':, Oiiticut Limo Iinish Red Top Keene's Cement is a high strength, white gypsum plaster used with finish lime putty for extremely hard, dense surfaces. Although Keene's Cement is a gypsum material, it differs from other gypsum plasters in several particulars; it is slow-setting; it is the only gypsum plaster that can lie re tempered; and the linish coal ret|uires more troweling. Kki>Topnuick-Tnfueling Keene's sets faster and requires less trowel ing. It must he used with a minimum of 25 Ihs. of dry hydrated lime per UK) Ihs. of Keene's Cement. Keene's-lime linish is similar in HID HD' KEENES CEMENT ? many respects to a lime-gauging fin ish except that Keene's Cement is used in varying projiortions, depend ing on hardness required, in (dace of gauging plaster. Kccnc's-limc finish should he used where greater resist ance to moisture, and greater surface hardness and resistance to abrasion arc desired--as in hospitals, kitch ens, bathrooms and corridors. for medium hard finish, mix in the proportion of .50 Ihs. of dry hydrated lime (100 Ihs. lime putty) to KM) Ihs. of Keene's Cement. for hard finish, limit the quantity of lime to 25 Ihs. of dry hydrated lime (50 Ihs. lime putty) to 1(M) Ihs. of Keene's Cement. APPLICATION the finish coat is applied over a set base coat which has been broomed and is partially dry. (If base roat has dried out, spray with water before finishing; do not soak). Scratch in a thin coat well ground into the hasc coat and immediately double hack with a second coat filled out to a true, even surface. Allow to draw up a few minutes, then trowel with water to a smooth glossy finish, free of cat faces and other blemishes. Complete troweling before finish has set. AVAILABLE U.S.G. BRANDS RED TOP CHAMPION Gauging PlaOor (while) RED TOP STAR Gouging Piaster (white) RED TOP Gouging Piaster (gray) RED TOP Gauging Plaster (gray) RED TOP Regular Keene's Cement (while) RED TOP Quick Troweling Keene's Cement (white) SET WITH LIME PUTTY Quick -- 20-30 min, Slow tel--45-60 min. Slow lot --45-60 min. Quick set-->20-30 min* 3-6 hours 1-2 hours 44 1 uniMW'H ......... iiiimi tWMH BB006 0783 IHi!* ijfcV i ' 1 Imi if 1 LIMITATIONS for interiorusesonly. W'licrecxposure lo water is extreme or continuous, use Portland cement-lime plaster. Apply Red Top Keene's Cement only over gypsum hasc coats of high compressive strength. Gypsum White Trowel Finish Rf.d Top Gypsum White Trowel F'inish is mill prepared and requires the addition of water only. It is recom mended for use over gypsum hase coats where extreme hardness and immediate decoration are required. Red Top White Trowel Finish is available in most areas and is rec ognized for its easy working quali ties and pure white finish. I TROWEL ; FINISH : | R.1 Sc ADVANTAGES rated the hardest of all finish plas ters, it provides protection against (lie most severe wear. 11 has approxi mately I wire I he strengl h of ordinary lime-gauging finishes. Noil-alkaline, it will not injure paint or decoration and may he decorated as soon as it has set and dried. Made of gypsum, it provides a durable and natural bond to gypsum base coat plaster. MIXING AND APPLICATION Red Top White Trowel Finish re quires the addition of water only. Allow to soak 1(1 or 15 minutes and then mix to a smooth, lump-free mortar of the desired consistency. Apply over a gypsum hase coat which has set, but is not hone dry. (If hasc coat has dried out, spray lightly, before the finish coat is ap plied. Do not soak.) Scratch in thor oughly, double hack and fill out to true, even surface. The finish should not exceed * in. thickness. Trowel the surface free of cal far es a nd oilier blemishes, using water spar ingly. Troweling must lx: complete before final set occurs. Work from unset edges to avoid joining marks. Gypsum Sand-Float Finish Reh Top Gypsum Sand-F loat F'inish is similar in every respect to gypsum trowel finish, except that it is care fully formulated with the correct proportion of properly graded sand. This provides a uniform, easy-work ing material whiih eliminates the uncertainty of job-mixed sand-llnat finishes. Available in its natural gray color, which requires painting for final decoration. Select lime-proof BB006 0784 45 color-. mav be added wliii li climin:itcs further <l<`<oration. APPLICATION same as for gypsum trowel finish ex cept that tin: final mat is I'midicd with a wood, carpel, cork or ruhhrr lloaL depending on texture defied. f;o|Miet| | in'rli I'hslnr Colored gvpsum finish plasters arc frequently used to produce a predecoralcd finish of either a finely lloaled or textured surface. Use of colored gypsum finish plasters elimi nates the need for further surface decoration. This speeds the plaster inn job and results in lower costs. ( olored gypsum finish plasters are avail able in cither factory prepared colors or they can he produced on the job. Oiif:ii!;il Inlcrior Cnluied finish a factory prepared colored finish con taining properly graded aggregate and select linicproof colors to insure easy working (pialitics and uniform ity in results. Available in II pastel colors and while, it requires no fur ther decoration and may lie applied to produce many types of surfaces ranging from a very line sand-lloat finish to a ragged texture. Highly resistant to abrasion because of its great hardness. Avoids variations of color intensity which sometimes occur when colors arc mixed on the job. Permits early occupancy. JOB PREPARED FINISHES require addition of linicproof colot pigments on the job to proper pro portions of lime putty, aggregate and Keene's Cement. In mixing a batch of this material for a job, the limeproof color should be thoroughly blended and mixed with the plaster to prevent color streaking and varia tion. It is also necessary to mix jobprepared colored interior tini lies in sulluicnl quantities to complete a job. Ibis eliminates color variation which would result from having to mix a second batch to match the lirst. s OKI f NI Al. INIfRtOH ifCOLORED FINISH PIASTER MIXING AND APPLICATION add clean water only, hoc stucco into the water. Allow to soak 20 or 31) minutes and mix thoroughly to a smooth, creamy easy-working con sistency. Must be applied to a set, "half-green" base coat of gypsum 46 BB006 0785 plaster. If the base coal is excep tionally dry, it should be sprayed uniformly with clean water the night before finishing. Application is made in a two coat double back operation. Scratch in a thin coat well ground into the base coat and double back with a second coat, filling out to a true even sur face. The surface can be lloaled with a sponge, sponge rubber (loat or car pel float. The finish ran also be ap plied in any desired texture except a smooth trowel finish. Do not use water while Moating. Oriental Exterior Stucco factory formulated to insure color uniformity. Applied to exterior sur faces over a base coat of Portland cement-lime and sand. Okikntai. Kxtcrior Colored finish is available in It pastel colors and white. Suitable for application on new work or for remodeling, it is an economical means for beautifying in two ways--texture and color. MIXING AND APPLICATION Okikntai, Kxtcrior Stucco requires only the addition of water on I be job. When it is mixed and applied in the following manner, excellent finished results may he obtained: 1.The suction of the base coal must be uniform, therefore, the base coat should be in a "half-green" condi tion. If it is too dry, spray lightly. (See detailed instructions (or mixing, applying, and curing of 1'ortland ccment-lime base coat, page 40.) 2. Remove loose and projecting par ticles from base coat, tben apply a thin coal well ground into (lie base and completely covering it. Double back and till out to a uniform surface about J ,s in. thick, covering area from lop to bottom, where practical, in one operation to eliminate join ings. Trowel three or four times before starting to texture. 3. Kor a lloat finish, use a cork, wood, carpel or sponge rubber lloat, and lloat the surface to an even texture. 4. Do not use water in Moating. 5. After setting, spray the surface periodically for several days to cure the finish. 6. Do not apply in freezing weather or before or during a rainstorm. 88006 0786 47 FINISH PLASTER m Gauging Plaster to Lime Quick Troweling Keene's to Lime Gypsum Gypsum Trowel Float ORIENTAL Finish Finish Finlih Mi* by weigh! of 1:2 dry moterials 2;1 Medium Hard 4:1 Hard Heal Neat Neat Color While or Gray (1) While White White Gray 1L. Finish Texture Smooth Smooth Smooth Smooth Float Float Hardness in (See (See Kilograms (2) 34 50 70 55 Note 3) Note 3) Workability 1 3 6 254 Coverage 1 ton gauging 2 tons Keene's 4 tons I ton 1 ton 1 ton will 2 tons lime 1 ton lime Keene's will will cover cover approx cover approx. 1 ton lime cover cover approx, 1000-1400 850-1200 Cover approx, approx. 250-300 yds. yds. approx. 350-400 250-275 yd*, 1300 1700 yds. yd,. vds. . 1. Gray with "locoi" gouging plaifer. 2. Kilograms required fo force a 10 MM ball .01 into plaster face. 3. These arc hard finishes but the aggregate in the surface does nol permit an indication with this test. 1 HI L' TOP Acoustical Plaslcr Ul'.h Tul' Acoustical I'lastcr is a highly sun ml absorbent, highly paintable acoustical plaster (<>r applicatioii over a properly prepared gvpKiim base coal. ll may Ik; finished in either a stippled or a stippled per forated surface. II is manufactured in oyster while only. ADVANTAGES Excellent Sound Absorption--slippled surface, .55 NKC; stipple per forated, .fit) N KG. Improved Poinlability--even after 6 spray coats of rcsin-cmulsion paint, stipple-perforated surface retains its .(it) NKC rating. Fire Resistant--incombustible, min eral cont|Misition. Adaptable--blends with any archi tectural design; stippling aids in con cealing minor trowel marks or join ings. Easily Applied--goes on quicklydevclops a siron,i; bond to base coat if ordinary precautions arc observed. BB006 0787 j Economical--applied in (wo succes sive coats, lb to 24 hours apart-- eliminates rc-scaHolding. appeared, stipple with a rice stippling1 brush to a uniform texture. LIMITATIONS Mixing and application directions must be strictly adhered to. Should be applied to areas not subject to rough usage or moisture. When perforating, use special U.S.G. perforator with rust proof nails. MIXING AND APPLICATION Machine mixing required. Use 31 (|ts. clean water for each bag of KkoToi'. Add plaster to water. Mix until mor tar weighs 15 to 17 lbs. net per 12-ql. pail (usually It) to 15 minutes mix ing required, depending on speed of mixer). \pply Rki) Top in 2 coats to a uniform total thickness of J in. over a base coat of Ki:n Top gypsum plas ter. A full scratch and brown coat arc required over metal lath. Rucklath plaster base and ma.-onry bases to provide proper rigidity, strength, and a solid base for the acou lical plaster. Apply first coat ' s in. thick over a set, cross-raked, semi-green brown coat. Darby lightly to a level sur face. Allow to set and dry (at least overnight) before applying finish coat. Apply finish coat Is it'- thick, scratching in and doubling back, leaving surface free of trowel marks. Work from wet edge to avoid joinings. When surface gloss has dis For stipple-perforated finish, per forate the surface about 31) minutes later, and before set, with a per forator furnished by United Stales Gypsum, l'erforations should num ber approximately 500 per sq. ft. and should be ?jf, in. deep. SABIMTE Acoustical Plaster TROWEL OR FLOAT a highly sound absorbent acoustical plaster which can produce a trowel or tloat. It is applieil over a prop erly prepared gypsum base coat, anil is available in oyster white and four standard colors. ADVANTAGES High Sound Absorption -- carries a .00 NKC in Trowel and .55 NKC in Float Finish. qB006 0788 49 Readily Maintained--elm ns with brush or wallpaper cleaner; may 1 >c spray-painted with only moderate loss of acoustical efficiency. Fire Resistant -- ineomlnistilile, min eral comixisilion. Adaptable--lilends with anv archi tectural design. Easily Applied--any good mechan ic, provided ordinary precautions are observed, ran apply Saiukiik. Economical--applied in two succes sive coats, 16 to 21 hours apart -- eliminates re scaffolding. LIMITATIONS Mixing and application instructions must be closely followed. Should be applied only to areas not subject to rough usage or moisture. MIXING AND APPLICATION SAHINIIE acoustical PLA9TER S' IM.lt t *' **"* .........non S*-.. .;!i' ( Machine mixing recommended. Put 2-1 i|iiarls clean water in mixer for each bag of Saiiim i e. Mix until SaiiiM'ik weighs IS to 17 lbs. net per 12-1(1. pail (usually .1 to 5 minutes, 50 depending on speed of mixer). To hand mix, place Saiiim i e in one end of clean mixing box. For each bag, add 25 f|ls. of dean water in other end. Hoc Saiiimte into water. The mix will appear dry, but do not add more water. Hoc until Sahinite weighs IS to 17 lbs. net per 12-qt. pail (approximately 15 minutes per 2-bag batch). Apply in 2 coats to a uniform total thickness of \<i in. over a base coal of Red Top gypsum plaster. A full scratch and brown coat arc required over metal lath, Rocki.aiii plaster base, and masonry bases (excluding monolithic concrete) to provide proper rigidity, strength, and a solid base for the acoustical plaster. Apply first coat in. thick by scratching in and doubling back over a set, semi-green gypsum base coat that is level and thoroughly broomed or cross raked. If base coal is dry, spray lightly to reduce suction. Fol low immediately with a wood or metal darby, leveling Saiiinite to provide a true, even surface for finish coat. Allow to set and to partially dry (at least overnight or longer de pending on job drying conditions) before applying finish coal. Apply finish coat to a thickness of Vt in. by scratching in and doubling back, over a set, partially dry base coat of Sahinitc. bring total thick ness to Vi in. Leave surface uniformly level and free of trowel marks, work ing from wet edge. Finish ceiling panels in one continuous operation to avoid joinings. BB006 0789 Trowel Finish--After water sheen leaves surface (about .10 minutes) trowel lightly to a uniform texture. l)o not use miter during troueting. Float Finish--lloat second coat 5 to 10 minutes after water sheen has left surface. Use a shingle, cork, or rubber lloat. Do not use water in floating. Direction* for Applying RED TOP or SABINITE Acoustical Plasters to Existing Ceilings or Smooth Mono lithic Concrete: Red Top or Saiiim i f: may be applied over existing plaster anil over new or existing concrete ceilings, using asphalt emulsion (Type N-l.l lll'C or C-1J 11I*C) as a bonding agent. On existing painted plaster or con crete ceilings, the surface must be dry, clean and sound. Calcimine or similar powder paints must be washed otf and wax, grease or oil removed. Loose or improperly bonded plaster or paint must be removed and such areas repaired with wood liber or patching plaster. Allow patch to dry 2 or 3 days. On new concrete ceilings which are smooth, level, and dense, the surface must be dry, free of dust, oil, grease or elllorescence. Si/e any porous concrete or porous or unpainted plaster surface with cutback asphalt, shellac or varnish to reduce suction before asphalt emulsion is applied. Trowel oil asphalt emulsion in thin coat not to exceed i' in. thick. Cover entire ceiling area. The first )( in. Coat of Red Tim or }{ in, coal of Saiiim if: should follow application of the emulsion as closely as possible and while the emulsion is still soft and plastic. Darby first coat of Red Tor or S mumit: to a true even surface with a minimum amount of pressure. Al low to set and partially dry. Apple Red Tor or Saiiimie finish rout as specified. Directions for Applying RED TOP or SABINITE Acoustical Plasters Over Rough Monolithic Concrete: (>vri properly prepared rough mono lithic concrete sin laces apply IIomi(KEIE plaster imt to exceed Va in. thickness on ceilings and 3x in. on side wall'. Apply the Red for or Saiiim IE over the set, semi green or dry lio.NDCKKT'E base coat ,usspecilled. Directions for Painting SABINITE or RED TOP Acoustical Plaster: Remove all loose dirt or dust from Saiiim ie or Red Tor by use of a hand vacuum cleaner. (Rutty type cleaner may be used to clean Saiiim i e trowel finish.) I'aint should he waterthinned. Imperial Tkxouie is rec ommended. First coat, mix one part Texoi.ite paste to one part water hy volume. Second coat (if required), mix one part Texoi.itk paste to two parts water by volume. Spray on with any gun with a medium line spray. DeVilhiss spray gun, type M III*, with a No. .10 nozzle or equiva lent, is recommended. Use 30 to 40 B8006 0790 51 II,s. pressure in the gun ;in<l 2(1 In .(0 lbs. on llio paint. Ilnlil noz/.le I I In IS in. away from work, llsc a slow, unilorin million. Cover surface in one pass. Do not pass over same area several limes as lliis Imilils up paint unnecessarily. Allow at leasl overnight drying In i w een coals. If weal her is extremely Innuiil, allow ailililional diving as necessary. IO TOP COVliR COAT I iuisliirifi Plnslor as a texture eradicatin' over other types of surfaces. Never use on inte rior of exterior poured concrete walls, or below grade level where moisture may he present. MIXING AND APPLICATION All surfaces must be clean and sound. Kcmovc all laitance and elllorescencc by dry brushing. Scrub surface with naphtha or mineral spirits to remove grease and foi in oil. Spray or wipe with a 5'/0 solution of Covut Coat Designed for appliculion to smoolh unpainlcil monolilhic Concrete. Knuds directly to such surfaces and provides a smoolh gray-while finish ready for decoral ion. ADVANTAGES Bonds as It Finishes -ready for final decoiation as soon as dry. Fire Resistant -- incombusl iblc, min eral composition. Easily Applied -- nnvgoodmechanic, provided ordinary precautions are observed, can apply Cover Com. Economical --eliminates hulling con crete lap joints . . . eliminates spark ling . . . eliminates hush hammering concrete to provide mechanical bond lor bond plaster and white coat. LIMITATIONS Mixing and application instructions must be closely followed. Use only over dry, smooth, unpainted mono lilhic concrete surfaces. Do no/ use IUDTOP COVER COAT (INISHINS PIASTER ^ ` bonder in water and allow to dry. I'alch holi-s and surface defects with paste of LaivKit Coat. Mix in clean box, tub or mechani cal mixer using 15 <|uarts worm looter LTtri-) per bag. Caution: If box or mixer has been used for mixing oilier materials, it must be scraped or wire brushed and rinsed with a 5% solu tion of alum followed by a clear water rinse. 52 BB 006 0791 Add plaster to water and mix until a uniform putty, free of all lumps, is obtained. Do not mix more material than can be applied in one hour. Apply Cover Coat in two coats over properly prepared concrete sur faces. Trowel Finith First Coat --Apply to a dry surface in sufficient thickness to cover existing imperfections. Trowel as smooth as possible after application to provide a level surface for the second coat. Allow to set and dry (normally, drying will take one or two days). Trowel Finish Second Coat - After first coat is thoroughly dry. apply finish coat as thin as possible, using only sufficient material to cover trowel marks. Smooth out as appli cation proceeds. Allow It) to 15 min utes for material to lake up: then water trowel to a smooth finish. Average total thickness should not exceed I s in. Cover Coat may be applied in one coat over a properly prepared and dry concrete surface bv scratch ing in a thin coat completely cover ing the concrete; doubling bark with a thin coat and levelling out the surface with light troweling. When it has taken up, trowel with water to a smooth level surface. Average total thickness should not exceed is in. Sand Float Finish--Mix 1! i parts while silica sand and one part Cover Coat by weight to lump-free mortar. Use as a finish coat over set, dry first coal. Lay on smooth and level; allow to take up, then final with sponge rubber float. Do not use sand in first root. Caution: Cover Coat Bonder must be applied over concrete prior to appli cation of Cover Coat to assure satis factory bond. Do not apply when temperature is below 55F. 1'rovide heal and venti lation after set. I'rolcct against dry out during hot, dry weather. Do not use in damp or humid local ions such as basements, shower stalls, laundry rooms, swimming pools, or (or appli cation to exterior masonry walls. Avoid contamination with alkaline materials (lime, portland cement, etc.) which interfere with proper setting and bonding action. t COVER COAT Bonder For use prior to applicat ion of Ci ivi k Coat to assure development of salisfactory bond. MIXING Add 2'2 lb. package to five gallons of water or one-half pound (approxi mately 1*2 cups) to one gallon of water. Stir until completely dissolved. These proportions represent a 5(,' solution. One gallon of solution prop erly applied should cover approxi mately 50 yards. APPLICATION All concrete surfaces must be clean and dry, free of grease, form oil, B3006 0792 rlHoresccncr and lailancc. Spray or brush all rumri'lr surfaces with Colin (Joai liondei, being suit to completely iuvrr all anas to which Cuvi-.a Com Finishing Piaster is to lie applied. Allow to illy. CAUTION I. Avoid soiling or s|ialtiling other surfaces to wliich Cuvi- h Com is not being applied. Wipe oil with ilauifi cloth any anas >pa 11 civil uilh Covin Com Bonder prior to paint ing. 2. Make fresh solution for each day's use. 3. Thoroughly rinse solu tion drums, pails, and spray guns alter use. COVER COAT PAINTING SPECIFICATIONS: 1, Ito not paint Covi n Com until dry. 2. Apply one coal of any good qual ity pigmented sealei. Where second coat is to he colored, hi st results may lie secured hy liming sealer coat to approximate shade of finish coat, hollow manufacturer's instructions for tinting. Ciinliim: Sealer Coat is necessary n hen unprotected steel in the surface of concrete results in rust spots on Covin Com. Properly applied pig mented sealer prevents rust from hleeding through t he decorat ion. 3. For finishing, any of the following may lie used: -- Apply one coat of a good quality Stipple finish paint. Stipple effect may he ohlnincd with a stippling roller. If a lighter texture is desired, use a lamh skin roller. -- One coat St AXn.uin I i:\oui k. --tfne coat Imiu.kI.m. Tkxoi.itk. -- One coat any good grade llat wall or ceiling paint. Specialized Lathing and Plastering Systems ROCKLATH Lathing Systems PAGE BRIDJOINT Lathing System 56 ROCKLATH Resilient Lathing System 58 BRACE-TITE Lathing System 60 2-inch Solid ROCKLATH and Plaster Partition 62 Exterior Wall Furring System 65 BRACE-TITE TRUSSTEEL Stud ROCKLATH Partition * 4-inch Hollow Long Length ROCKLATH Partition 67 70 Column Fireproofing 72 USG has developed a complete line of attachment systems employing the use of dips for attaching Rocki.a iii Plaster Itasc to wood framing, metal grillage, Tiu ssma Studs and masonrv * walls. Thesesystems aredesigned to provide performance and economy in theconstruction of plastered walls and i filings which offer: 1. (ireater resistance to cracking 2. Reduced sound transmission 3. High lire resistance 4. Insulation 5. Vapor harrier 6. Komomy CD C0 ^ O' *0 54 98006 0793 55 ( ! 'did BRIDJOINT Lathing System DESCRIPTION The lathing system uses ItuutpMNr dips to apply Rockl.,vin I'lasler base on walls ami ceilings in sueli a manner lliat the ends (Hi-inch dimension) of the lath fall hot ween and not on I he framing members. The }" II I field clip and H-2 corner dip are used (or Jjj" Rock- i.aih. A ll-l field clip is used when Yi Rocki.aiii is applied over nailable steel framing. DIRECTIONS FOR LATHING AND PLASTERING lathing -- KncKi.ATtt is applied in such a manner that the endd of I he lath do not fall on the framing mem bers. lend joints are staggered in alternate courses. A Hkiiijoint clip is used at corners o! each piece of lath to support the lath ends which fall between the framing members. Kmcklatii is nailed to the wood or steel framing. (.Vet- piigr >6 for nail S) ledllcations.) Plostering--plaster in two or three coals to * 2-inch thickness. (.Sir poge 54 for plastering specifications.) Estimating Quantities--lt-1 clips, three per square yard; It 2 clips, one for cadi Hi indies of corner angles (or 75% of total lineal feet of corner angles). m r i I: ` *C: ADVANTAGES Crack Resistant--because ends of gvpsum lath do not fall on (raining members, resistance to cracking is increased at these vulnerable points. Adaptable--(bis system permits ap plication of Uocki.a i It over nailable steel framing if framing members arc not spaced more than 24 indies o.c. and if j 2-inch thick Rocki.atii is used in place of ?S-inch. Economical--25% less nailing is rc(|iiircd than conventional nailing of RoCKi.ATir plaster base to wood studs. On wood frame construction Cornerile and nailing are eliminated in the internal corners. - `.I 57 9B006 0797 ROCKLATH RESILIENT Lathing System DESCRIPTION Kocki.aiil Resilient Lathing System uses steel spring clips for at ladling Rocki.aiti plaster Rase In wood (raining, sleel channels nr masonry, t hese resilient dips lion I the Kock i.a ill and plaster tree Irom Iraining members. brown eoals) have a one hour lire rating. Economical -- Fora nominal increase in the lathing cost, the Rocki.aiii Resilient Lathing System provides outstanding sound and crack resist ance features. ADVANTAGES Resistant to Sound Transmission -- National bureau of Standards as signs average sound transmission loss rating of 52.2 decibels to a wood stud partition with R \ resilient dips, gypsum lath and plaster both sides. Crack Resistant--plaster cracking due to (raining movement is greatly reduced. W here (laming movement occurs bark u( lath and plaster, it is absorbed by the sirring clips in much the same manner as automobile springs soften road shocks. One Hour Fire Rating -- wood stud partitions with R-l Resilient Clips, perforated Rocki.aiii, and 12 inch gypsum perlite plaster proportioned (00 lbs : 2j -j cu. ft. (scratch ami DIRECTIONS FOR LATHING AND PLASTERING lathing--apply Rocki.aiii plaster base lace out with the long dimen sions at right angles to the framing members 16 inches o.c. Stagger end joints. Rocki.aiii ends must occur over framing members a ml he secured with dips. I'lacca dipat every inter section of Kocki.atii edges and fram ing members. Staple or wire-lie all comer head to Kocki.atii. Do not nail Kocki.atii or accessories to framing. Where Resilient Kocki.atii ceiling joins conventional nail-on walls or partitions, a J-g-inch thick furring strip (usually a strip of Kocki.atii 2 indies wide) should he nailed to joists at ceiling angle to compensate ^006> 079B \ SPRING ACIION resiliency ABSORBS FRAME MOVEMENT HERE ... for the Da-inch furring of K-l Kcsilicnl Clips. Use a H-2 IIkidjoint Cor ner Clip in place of K-2 Kcsilicnt Corner Clip. If walls ;vre resilient and ceilings nail on, nail furring strip to the studs at the ceiling line. Do not use nails iir corner angles. CAUTION I'erforatcd Kocki aiti is not recom mended for use on ceilings when applied with resilient dips. Plastering -- plaster (o '(j-incli grounds with sand or perlite aggre gates. On ceiling work use only plain FLEXIBILITY replaces rigidity without loss of strength; walls and ceilings are thus able to compensate for normal frame movement, and the plaster surfaces are protected against cracking. Kocki.a iti ami apply plaster in three mats (do not "sera l( li-don hleback"). Where one hour lire rated wood stud partition N required, plas ter to Cj-imh grounds with gyp-mmporlilc plaster proportioned Kill pounds gypsum plaster to 2) ! cubic feel perlite (scratch and brown coats). Estimating Quantities -- K-l, K-l, K-5 clips- Cstimatc SJ-j to 6 per square yard. K-2 dips--I for each 16 inches of corner angles (or 75' of total lineal feet of corner angles). K I and K-2 combined, 6 per squaii* \ a rd. BUM Lathing System DESCRIPTION The: Brack-Tits; Lathing System lUiirhcs Kocki.atii plaster base In standard metal grillage (?.t-indi hot or cold rolled channels nol over 16 inches o.c.). This system is also used as a base (or direct application of acoustical tile. ADVANTAGES Strong--gives support across (he full width of Rocki.ain. Clip provides spring tension (o (he center. Easy la Erect--requires no special lools. Channels need nol lie spaced under l(> inches o.c. Two-Coat Plastering--permits use of scratch double-back method over plain or peiforated Kocri.aiii. blas ter thickness is j^-indi. One Hour Fire Rating--when plas tered /-jj-inrh thick over perforated Kocki.atii with gypsum-perlite plas ter proportioned 100 lbs : 2J cu. ft. DIRECTIONS FOR LATHING AND PLASTERING Lathing--1. I'lace starter clip over .pinch channel at juncture of chan nel and side wall. (A'ole: If hot rolled ihnnncls ore used, hand crimp dips toJit snugly over dinnnrl legs.) (Sec A.) 2. I'lace Kocki.atii plaster base on top of starter clip loop and at right angles to channel. Kngagc BiiackTjtk field clip over channel and hook it into starter clip loop. On first course of lath, crimp field LATH corner. 9B006 07gg ..........p't |l"ll"HLl*J 'll |I|P clip wire to accommodate slack caused by starter clip loop project ing from wall. Use H-! Hriiijdint clip at each end joint, see (II). End joints should be staggered to fall between channels. Use a H-l Uhidjoint dip on both sides of lath end joints, See (C). U|x>n completing a course of Kocki.atii, slip a 11-1 IIridjoint clip over each end joint so that il is firmly sup[H>rled. 3. After first course of Kocki.atii is completed, no further crimping of wire is necessary. Succeeding courses are rapidly applied by looping each field clip over channel and inserting hook into eve of preceding held dip. Complete last course by nil ling Kocki.atii to fit remaining space. Hang field clip over channel end, insert hook end under preceding clip, pull back and snip off excess length. Plastering--apply gypsum plaster in two or three coals j-iooh I hick, using sand or perlite as aggregate. If one hour fire rating is required, apply gypsum-perlite plaster proportioned 100 His : 2) cu. ft., *x-indi thick over (icrforatcd Kocki.atii. Estimating Quantities--for 5 j inch channels, H> inches o.c.: one H I-1 Starter Clip for cadi channel abut ting a vertical plane and at any interruption of channel. 5}-j to 6 HT-1 Field Clips per yard. 4 B-l IIridjoint Field Clips per yard. For %-inch channels, 12 inches o.c.: HT-1 Starter Clips, same as for Hi-inch spacing. 7|-.j to S HT-1 Field Clips per yard. H-l Hridjuint Field Clips, same as for 16-incli spacing. BB006 0300 61 2-IN. SOLID ROCKLATH and Plaster Partition DESCRIPTION A sludlcss nun load Irinn partition ron-isting of 1 u iin li \'-nine, l.ong l.cnglh Room \iii plusler base, In l 1 vert ically by lloor amt ceiling lim ners, up In 12 feel in height, -I in I pla-'I<!<'< 1 mi Iii>1 li sides. ADVANTAGES Save Space--Saves -10 In bit per cent u| -pure urrupinl by nnivciilmnal pin I il ions. In even live line;il lei I a 2" partition (rentes one r\|r;i square foul nl usable spine nver n 41 >" part it ion. lightweight--only Hi pundits with gypsum-sand pln-ler and *1 pminils with gypsum perlite per square fuut of finished pnrliliuii 125' ,', In -10' lighter limn commonly used nia-omy pa 11 il inns). Strong--ullieinl imparl lest rec ords slimv tlull a 00 pnund ueighL traveling through a full arc fall of 4 feel (ailed In produce a discernible crack on a full size partition after three successive blows. One Hour Fire Roling -- willl gyp sum plaster sanded 1.1 for serateh and 1:2 for bouvn coal or gypsumperlite proportioned 100 lbs. to 2 cu. II. mi serateh coat and d cu. ft. on brown coal. W here one hour lire rat ing is not reipiired, plaster may be sanded 1:2 for scratch and I :d for brown eoat. DIRECTIONS FOR LATHING AND PLASTERING Floor Runner--IhSti Mela! base or wood runner. Indicate positions of lluor rmmers with chalk lines. W hen UStl Metal base is used, metal Hour dips should he nailed approximately 24 inches o.c. Snap metal base side plates over shoulders of I he clips. Wood runner should be milled If* a x 2 inches from select slock re sistant to splitting. Ceiling Runners -- Apply CSC 62 33006 0301 1,-sbapc ceiling runner u-ing 1 '< inch concrete stub nails or power driven nails approximately 21 inches apart. Nail to a line plumbed up trom center line of Hour runner. If ceiling is suspended type, wire-tie I.-shape runner to lath. Grouting -- kill metal base with gyp sum grout using uniform V-groovc. Recommended grout mixture-: Kill lbs. gypsum plaster to d cu. ft. of perlite, or dot) lbs. of sand. Lathing--Cut l.nng Length Ku< Kt.ATil to allow a minimum of 1 | inch and a maximum of I * t indie- top clearance. Set in \-grooved ha-c sec tion with lop edge against vertical flange of ceiling runner, ledges should be plumb and bulling. To hold lath to ceiling runner, snap two LSI! Ceiling Runner Clips through the top or center row ol slots. I.ath is cut and tit t lowly around conduit-, outlet boxes :md sled door buck struts. Due side of opening is covered with metal lath strips hacked with No. dl) asphalt felt (usually d to 5 indies wide) applied with hand stapling machines. Partitions (up to d feel high) aie then horizontally braced in I lie- lol lowing maimer, see photo at left: 33006 0802 63 (I) Punch hole i;i center r.f each lath slit'll!Iv below mid-|minl lor Inuring dip; (2) insert bracing dip; (2) spring a partition lent;!It *,j im h colil rolled diamiel into bracing dip with channel legs pointing down; (t) insert remaining bracing clips and spring channel into place; (5) wiretic channel ends at abutting parti tion angles to coincide; ((>) parti tions !> to 12 feel high require two horizontal braces at third points in stalled as described above; (7) wedge vertical brace (usually wood Ix l'sor angle iron) between Hour and ceiling every 6 feet and wire-tic to horizontal channel. Plastering--Apply a full JjJ inch thick scratch coat of plaster to each side of the lath. In no case should application of scratch coat to second side of lath be delayed longer than the setting lime of the scratch coat applied to the first side. Scratch lightly in horizontal direction only. hi sirnhii (out set a minimum of 16 hours before browning. Apply the brown coat as follows: (I) After the scratch coals have set firmly and have partially dried, the brown coat should be applied to the iinbrnml side, bringing it out to within 'fit-inch of ground dimension for finish coat to bring over all parti tion thickness to 2 inches. (2) When this brown coat has set firmly, (not less than 3 hours) remove braces oircjully from opposite side and ap ply brown coat to that side in similar 3U006 0803 System DESCRIPTION A simple practical system for furring exterior masonry walls using USti Adjustable Wall Furring brackets, ?.|/-inrh channels and Long Length Insulating RocKt.A i it (:!s inch thick by 21-inch x ceiling height). ADVANTAGES USG Furring Bracket--Heavy gauge galvanized steel with serrated edge which holds channel firmly in place, l'ermits proper wall alignment. Adjustable--uneven walls can be furred quickly to true, even surface without expensive, time consuming "shimming." low Cost--large 2 ft. wide ceiling high sheets of long length Km ki.aiii plaster base go up quickly. Uni formly even plaster base saves plas tering material anil labor. Vapor Barrier--jnovides inexpensive and efficient safeguard against con densation within the wall. Insulation--offers the equivalent of j 2-iucli of fiber insulation board when erected with the required :l j* minimum air space between exterior wall and lath. DIRECTIONS FOR LATHING AND PLASTERING Application of Metal or Wood Floor Runner--Nail single metal base clips to rough lloor not over 2d inches o.c. Snap the sideplatc over the clips. Fill the back of the base with grout and forma V-groove as grout stiffens and before it sets providing a ') \ im h (rV'jW ' -M ' ifi! jin i.i ;-i :ii ll;l' ' 33006 0304 65