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USG GYPSUM PLASTERS AND FINISHING LIMES A.I.A. File 21-A UNITED STATES GYPSUM 195 9 CS004 1566 TABLE OF CONTENTS BASECOAT PLASTERS THREE COAT PLASTER Iq three coat work, the first (scratch) coat is raked to provide tooth for the second ibrowru coat. Id two coat work oo gypsum lath and maaoory the b&aecoat may be applied by scratching in and immedi ately doubling back to fill out to grounds. In all cases the basecoat should be left level under the rod. but rough to receive the finish coat. TWO COAT PLASTER Basecoat plaster is applied directly to the plaster base (usually lath or unit masonry) m sufficient thickness to hide the framework of the structure in the contour angles curves or plane surfaces of the architectural design, and to provide a sound, durable base, with fire resistance as required, for the finish coat and subsequent decoration. 2 r INDEX A. BASECOATS Correct selection and application of U. S. Gypsum basecoat plasters over a properly prepared standard plaster base such as PYROBAR" gypsum tile, clay tile, concrete masonry units, ROCKLATH* plaster base, metal lath, or monolithic concrete, assures good basecoat plaster adhesion. They are formulated to set and dry, under recommended job conditions as covered in the specifications, in sufficient time to prevent construction delay. Pge Gypsum Plaster....................................................................................... 3 Plaster Aggregates................................................................................. 3 RED TOP* Gypsum Cement Plaster...................................................... 4 RED TOP Wood Fiber Plaster............................................................... 4 RED TOP STRUCTO-UTE* Gypsum Plaster.......................................... 5 BONCRETE* Plaster................................................................................ 5 Portland Cement-Lime Plaster Basecoat.............................................. 6 Technical Data--Finish Plasters............................................................. 6 Exterior Stucco Basecoat........................................................................ 6 Fire Test Data.......................................................................................... 7 Technical Oata--Basecoat Plasters...................................................... 7 B. FINISHING COATS Finish coat plaster provides the base for final decoration. It is applied to a thickness of from 1 )' in. t0 H in., usually over a gypsum plaster basecoat. There are several types of finish coats, each formulated to serve specific requirements and generally classified according to their principal ingredients. Finishing Limes IVORY* . Double hydrate..................................................................... 8 RED TOP B. GRAND PRIZE* Hydrate (Dolomific)................................ 8 RED TOP 8, CHESHIRE* Quicklime (High Calcium)............................. 8 Gauging Plasters CHAMPION* . quick set................................................................... STAR* . slow set..................................................................................... REO TOP Gouging . slow or quick sot................................................ STRUCTO-GAUGE.................................................................................. Keene's Cement . regular or quick troweling..................................... 8 8 8 8 8 Prepared Gypsum Finishing Plasters RED TOP Gypsum Trowel Plasters..................... 9 RED TOP Gypsum Sand Float Finish.................................................... 9 Colored Finishing Plaster ORIENTAL* . interior.............................................................................. 9 ORIENTAL . exterior............................................................................... 9 Acoustical Finishing Plasters SABINIT*................................................................................................... 9 Hl-UTE*..................................................................................................... 9 AUDICOTE*.............................................................................................. 9 C. ORNAMENTAL PLASTERS MB. Moulding Plasters.................................................................................... 9 Costing Plasters....................................................................................... 9 pogm D. SPECIFICATIONS................................................ 10-12 'T.M. Reg. U.S. Pat. Off. CS004 150/ USG GYPSUM PLASTERS C GYPSUM PLASTER For Bosecoots PLASTER AGGREGATES For Bosecoots SAND DESCRIPTION Sand is the most commonly used plaster aggregate. It is rela tively inexpensive and readily available in most locations. The base of all gypsum plasters is gypsum rock, or hydrous Three important factors must be considered when sand is used: calcium sulfate, which has a water content of about 20 per cent in chemical combination. During manufacture of this water 1. Sand must comply with the requirements of ASTM Designa tion C35 for graduation. .1 is removed. When water is added at the job, the material crystallizes (sets), reverting to its original chemical form. In RED TOP* Gypsum Plasters, other materials are added in small amounts to control working qualities and setting time. 2 Sand must be clean. Foreign matter weakens the plaster, reduces its hardness, and may lengthen or quicken the setting time. The character and proportions of these additives vary according 3. Sand must be correctly proportioned with gypsum cement to the type of intended use and the climatic conditions of the plaster as shown in the table below. Proper proportioning is area in which the plaster will be used. readily accomplished by use of a standard shovel size. A No. 2 U. S. Gypsum basecoat plasters can be used on gypsum and shovel, for example, holds approximately 15 pounds of damp, metal lath; gypsum, day, or concrete tile; concrete or cinder loose sand. For 1:2 mix, 13 shovelfuls of sand would be required blocks; monolithic concrete; brick, or other approved plaster with each 100-pound bag of plaster, 20 shovels for a 1:3 mix. bases. When the proper plaster for the plaster base is applied correctly, it will bond firmly to the base to provide a sound LIGHTWEIGHT AGGREGATES foundation for the finish coat. Lightweight aggregates are often used because of their ease of handling in inclement weather and cold weather, reduced dead load, and excellent fire protection qualities. FUNCTION AND UTILITY Job mixed lightweight aggregate plasters have certain limita tions. Their compressive and tensile strengths with proportion In selection of a basecoat plaster, several factors must be con sidered; Location; use to which the plastered surface will be put; fire ratings required; sound insulation properties desired; probable abuse of the plastered surface, etc. The prindpal problems to be considered are outlined below. ing of 100 lbs. of gypsum to 2 and 3 cubic feet of aggregate are generally lower than strengths obtained with sanded plaster. (See technical data, page 7). Gypsum-gauged lime "White coat" trowelled finish, being hard and brittle, is not compatible with low strength basecoats and cracking may result. Mill mixed perlited plaster, such as STRUCTO-LITE, provides Fir* Protection Gypsum base plasters, properly proportioned with approved aggregates, provide excellent fire protection. (See page 7 for technical data on fire ratings.) For maximum fire resistance in ceiling construction, use RED TOP gypsum plaster with lightweight aggregate over lathing base. all the advantages of lightweight aggregate plaster, but is manufactured and formulated under laboratory control to provide desirable compressive strength, control of aggregate through quarrying selected ore and expanding and processing to exacting standards of hardness and gradation and proportion ing to attain adequate strength, and proper set and suction, strength (See page 7.) Strength varies with the type and quan enabling the architect to obtain satisfactory job results. tity of aggregate used, the thickness of the basecoat, and the Recommended finish coats for STRUCTO-LITE include, first; integrity of the plaster base over which the basecoat plaster is Sand float finishes applied. and second: Sound Insulation. Base plasters add mass to masonry units or specially designed lathing systems, providing increased sound transmission losses for these assemblies. Basecoat plasters with sand aggregate provide better sound insulation than those with lightweight aggregate, due to the greater weight of the sand. Lime putty coats with the addition of approximately 25 lbs. of No. 1 white Silica Sand or approximately }4 cu. ft. of perlite fines per 100 lbs. of gauging plaster, which will trowel to a smooth surface. Under no consideration should Keene's Cement or STRUCTOGAUGE finishes be used over STRUCTO-LITE. Abuco For surfaces which must endure abuse (school corridors, Lightweight aggregate gypsum plasters generally have less etc.), wood fiber plaster, or RED TOP gypsum plaster with favorable sound transmission loss ratings than sand aggregate sand aggregate, will provide the best results. gypsum plaster. USE OF AGGREGATES WITH GYPSUM CEMENT PLASTER--Maximum Recommended Proportions L Plaitaring Bat* Gypsum Lath Metal Lath Unit Masonry; Gypsum Tile Clay Tile Brick Cement Block Number of Coots Three coatsi Scratdt coat Brown coat Two coats Basecoat Three coats* Scratch coat Brown coat Three coats: Scratch coat Brown coat Two coats: Basecoat Plostar to Sand By W*jght 1:2 1:3 1:2 'h 1:2 1:3 1:3 1:3 1:3 Varmiculita, Parlita Waight of Piastar to Cubic Faat of Aggragofa 100:2 100:3 1 00:2 Zl 100,2 100:3 1 00:3 1 00:3 100=3 2 O' $ CS'004 15BB *T.M. Reg. U.S. Pat. Off. UNITED STATES GYPSUM 3 mamm BASECOAT PLASTERS RED TOP CEMENT PLASTER RED TOP Cement Plaster is a neat gypsum basecoat plaster to which water and an aggregate are added on the job. Complies with ASTM Designation. C28 for neat gypsum plaster and Federal Specification SS-P-402, Type N. Used for both first (scratch) and second (brown) coats. Available in following formulations: Regular--For use with sand aggre gate, hand application. LW--For use with lightweight aggregates, hand application. Machine Appli cation--for sand or lightweight aggregates. RED TOP SYPSUM CEMENT PLASTER S & vaiT.B... Function and Utility Architects and builders specify RED TOP Cement Plaster: 1. To meet specific published fire ratings as established by local fire codes or insurance rating bureaus; 2. To provide mass for,better sound insulation properties; 3. To provide a harder, stronger basecoat; 4. For real economy. The neat gypsum used in RED TOP Cement Plaster is inexpensive. It is mixed with economical aggregate which increases its bulk and its coverage. Highly plastic, it is easily and quickly applied. 5. To take advantage of the several special formulations developed to insure best quality results when used with the various types of aggregates and whether applied by hand or with machine. RED TOP WOOD FIBER PLASTER RED TOP Wood Fiber plaster is a gypsum basecoat plaster which contains selected wood fiber, fine ly shredded. It requires the addi tion of only water on the job. RED TOP Wood Fiber Plaster complies with ASTM Designa tion C28, gypsum wood-fibered plaster, and Federal Specification SS-p-402, Type W. By comparison with plaster sand ed 1:3, RED TOP Wood Fiber plaster has approximately three times greater compressive strength, two and one half times greater im pact strength, and 50 per cent greater hardness. Offers far great er resistance to cracking. RED TOP Wood Fiber Plaster has greater fire resistance than sanded plaster basecoats at equal thickness. See data on page 6. It is ready for use--needs only water. Eliminates risk of im proper proportioning of plaster and aggregate. Over unit masonry, because of excessive suction, up to one part of sand may be added. A wood fiber basecoat plaster job costs approximately 10 to 15 per cent more than the same job done with RED TOP Cement Plaster sanded on site. ^ Limitations of Use 1. RED TOP Cement Plaster must have aggregate added strictly according to specifications. Use of too much aggregate drastically decreases its strength. 2. Where sound transmission is the prime considera tion in partition or ceiling assemblies use sand aggre gate only, since mass is a controlling factor. 3. BONDCRETE should be used on interior concrete surfaces providing the surface is sufficiently rough to provide a proper bond. Maximum thickness of BONDCRETE and basecoat shall not exceed W on ceilings or on walls. If additional thickness is required, self-furring metal lath should be secured to the concrete surfaces. Under no circumstances should RED TOP Cement Plaster or Wood Fiber plaster be applied directly to monolithic concrete. 4. Gypsum Plasters should not be used where in con tact with excessive water or moisture conditions. In such instances use portland cement-lime plaster. Gypsum Plasters may be applied to ceilings or open porches, car-ports, soffits of eaves, walkways, and canopies, but only when these surfaces are horizontal or inclined away from the structure. All such plaster surfaces shall be protected from direct exposure to *T.M. Reg. U.S. Paf. Off. 4 >l C RED TOP STRUCTO-LITE* PLASTER RED TOP STRUCTO-LITE plas ter is a high quality basecoat plaster prepared at the mill by a careful proportioning of expanded perlite and gypsum plaster. For use on the job it requires only the addition of * water. STRUCTO-LITE complies with ASTM Designation C28 for gyp sum ready-mixed plaster. The proper proportioning of gyp RED TOP .. sum cement plaster with a well graded, controlled-density perlite STRUCTOJJtt T|r aggregate, and the establishment of a mill-controlled set, help to as 6YP5UM sure uniform strength in the plaster slab. Because the perlite in STRUCTO- PLASTER TAT** rfMW CBwmm- LITE conforms with exacting spec ifications for density, strength, - and gradation, and is thoroughly C mixed with the cement plaster at the mill, the plaster coat is of uni form hardness throughout. While many fire-tests have been completed on partition and ceiling assemblies, additional tests are scheduled, and until these are com plete, "STRUCTO-LITE" cannot be specified to meet all code and insurance rating requirements. (See technical data on Page six.) The "k" factor of STRUCTO-LITE plaster is approximately 1.4, or about three times that of a gypsum-sand basecoat. Available in several special formulations: Regular STRUCTO-LITE Masonry STRUCTO-LITE--for use on high suction unit masonry bases only. STRUCTO-LITE for Machine Application. USG GYPSUM PLASTERS BONDCRETE* PLASTER RED TOP BONDCRETE is a gypsum basecoat plaster specially formulated to bond firmly with rough interior monolithic concrete surfaces. It is factory-mixed, and on the job requires only the addi tion of water to make it ready for use. Complies with ASTM Speci fication C-28. BONDCRETE provides a base to receive a brown or leveling coat of RED TOP Cement plaster or Wood Fiber Plaster where three coats are to be used. If a leveling coat is not required, the finish plaster can be applied directly to the BONDCRETE with excellent results. BONDCRETE has approximate ly the same coefficient of expan sion as concrete. BONDCRETE adheres to proper ly prepared concrete surfaces. For proper conditioning of surfaces, see Specifications, Surface Prepa ration, page 10. Correct prepara tion is important. The low cost of BONDCRETE makes it an economical bonding coat for application directly to rough concrete surfaces. CS004 1590 rain and suitable drips and casings provided along edge exposure. 5. Plaster application on masonry walls or concrete, that have been coated with bituminous compounds, is not recommended. Because of the possiblity of condensation or water seepage, plastering directly to interior side of solid exterior masonry walls above grade or exterior founda tion walls below grade is not recommended. In each in stance they shall be furred and lathed before plaster ing. Sub-grade construction water-proofed on the exterior side. .6 Radiant heat plaster slabs shall not have surface temperatures exceeding 115 Fahrenheit. Check con ductivity of the plaster and aggregate. The thermal conductivity of gypsum-sand plaster is approximately three times that of STRUCTO-LITE. 7. Basecoat plasters must not abut or die against the hollow metal door frame return, unless provision is made to dampen the trim return vibration by grouting, special anchors, or both. Lath and plaster should recess into or behind metal frames or base. TJA. Reg. U.S. Pal. Off. UNITED STATES GYPSUM 5 6IBS BASECOAT PLASTERS FINISHING PLASTERS r PORTLAND CEMENT-LIME PLASTER AND EXTERIOR STUCCO BASECOAT Portland cement-lime plaster is prepared on the job from Port land cement, lime, sand, and water, in the following propor tions: For the scratch coat 1 bag of Portland cement, 2 bags of MORTASEAL* lime, TA cubic feet of sand, and (over metal lath or stucco mesh) 2 lb fiber. For the brown coat, 1 bag Port land cement, 2 bags MORTASEAL, and 9 cubic feet of sand. It is used for application directly to concrete block, clay tile, or metal lath as a base for ceramic tile, or in areas subject to high- moisture conditions. It is the basecoat for ORIENTAL* Exterior (colored) finish. It is used for the scratch (first) coat and brown (second) coat over cement block or clay tile, or over sheathing to which STUCCO MESH or self-furring metal lath has been properly applied. Limitations of Use I. Each coat requires curing with water after set. 2. Must not be applied directly to smooth, dense surfaces, gyp sum lath, or gypsum block. Metal lath must be secured to such surfaces before plaster is applied. 3. Provision is needed for relief of shrinkage in setting and drying at points where ceiling and wall meet, or where beams, columns, and fixtures pass through the plaster. Expansion joints should be provided to avoid excessive continuous areas. FINISHING COAT PLASTERS Description Finish coat plaster provides the base for wall or ceiling decora tion. It is usually applied over a gypsum plaster basecoat, and to a thickness of (fj to y% inch. Each of the several available types of finish coat has individual characteristics to meet special requirements. These types are generally classified according to the principal cementitious ingredient. Type* I. Gypsum-gauged-lime, commonly known as "white coat," for a smooth, white trowel finish. It consists of lime properly pre pared to a smooth putty and mixed with gypsum gauging plaster. With the addition of sand, it is adaptable for sand float finishes. Structo-gauge is a recent development in gauging plaster which produces high compressive strengths. Lime putty, gauged with Structo-gauge produces economically an extremely hard smooth trowel finish. For a good white coat, the lime must be highly plastic and properly hydrated. Gauging plaster must be correctly propor tioned to lime putty, and ingredients must be thoroughly blend ed. Careful application and sufficient trowelling during and after set are essential to produce a smooth, glossy surface. Over lightweight aggregate basecoats, the addition of up to 25# of fine Silica Sand, or up to lA cu. ft. of perlite fines, per 100# of gauging plaster U recommended, to improve working qualities and to help minimize map-cracking. 2. Keene's Lime: for a hard, smooth, white trowel finish. With the addition of sand, it is adaptable for sand float finishes. Also available mill-mixed and colored under ORIENTAL Interior Finish brand. 3. Gypsum, for trowel (smooth) or sand float prepared finishes. 4. Acoustical Plaster, for sound absorption. Available in SABINITE*, AUDICOTEf, and HI-LITEt types. See page 9. Dolomitic Lime Hydration c The United States Gypsum Company was the leader in solution of the dolomitic lime hydration problem with the development of IVORY* Double Hydrated finishing lime. This is a "fully" or "pressure" hydrated (less than 8 per cent unhydrated) Ohio dolomitic finishing lime. ASTM Specification C206 for special finishing lime, and pro posed amendments to Federal specifications, cover fully (92 per cent) hydrated limes. The National Lime Association has pub lished its own specifications. This type of finishing lime is re quired by American Standards Association Specifications for Gypsum Plastering, A42.1-1955. All high calcium hydrated limes, properly soaked, comply with these requirements, as do high calcium quicklimes, properly slaked. TECHNICAL DATA--FINISH PLASTERS MU by weight of dry imderialti Color OAIMMNO FIASTU TO L1M1 STKUCTO-OAUOf TO UMf 1,2 1*2 111 Medium Hard Hard White Whit* Whit* QUICK TVOWBJNO KflNf'S TO UMf 2il Medium Hard Whit. 4.1 Hard White finish Texture Smooth Smooth Smooth Smooth Smooth Hardness in Kilograms If) Workability 34 56 108 30 70 1 I 247 Cost Factor Labor & Mat`1. 100 123 130 170 180 (fj Kilograms required to fore* a 10mm ball .01' into plotter face. {} Hies* are hard finishes but the aggregate in the surface does not permit an indication with this test. GYPSUM TVOWVL FINISH NEAT Whit. Smooth 55 3 125 GYPSUM FLOAT FINISH NEAT Whit, or Gray Float C) 6 125 OtIINTAi FINISH NEAT 7 Colors Float It) 5 160 *T.M. Reg. U.S. Pat. Off. 6 CS004 1591 I USG GYPSUM PLASTERS 1 I C l I FIRE TEST DATA (Ail t#*t mod# at nationally rocognlxod fir# tatting laboratories) CONSTRUCTION TYPE RASI PANEL TYPE P1AST1I A AOOKIOATf (H) THICKNESS RATING Wood Frame Wood From# Wood Frame Wood Frame Wood Frame Wood Frame Wood Frame Wood Promo Wood Frame V Hollow PYROBAR* 4' Hodov* PYROBAR Solid Solid Solid Solid Solid TRUSSim* Stud TRUSSTEEL Stud TRUSSTER Stud TRUSSTER Stud TRUSSTER Stud TRUSSTER Stud H# ROOCLATH* Plain %' *OCXLATH Plain H' Perf. ROCXLATH H' Perf. ROCKLATH H* P*rf. ROCKLATH Metoi Loth Metal Lath Moral Lath Metal lath Metal Lath Metal Lath Metoi Loth ROCKLATH ROCKLATH Metal lath Metal Lath Metal Lath Metoi Lath Metal Lath H' Ferf. ROCKLATH BRACE-TTTE* Clips Wood Frame Wood From* Wood Frame Wood Frame Steel Joat (C| Steel iobt (C) Steel Joist (C) Steel Joist (Cl Steel Joist (Cj Steel Joat 1C) Steel Joist (C) Cellular Steel Root Cellular Steel Root Cellular Steel Roar Cellular Steei Root Suspended Channel Ceiling (incombustible constr. abowel H' Perf. ROCKLATH (A) H' Perf. ROCKLATH Metal loth (B) Metoi lath H' Perf. ROCKLATH 8RACE-TTTE Clips Channels lb' ox. Some, plus 1 4 Go diogonof wire eamedng dips Some, except channols 1 2' ox. Metoi Lath Metoi lath Metal Lath Metal Lath Metal Lath (0} Metal Lath (E) Metal Loth (D) Metal Lath Metal Lath Steel Section Steel Section Steel Section Steel Section Steel Sedan Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Metoi Lath Metoi Lath |P) Metoi Loth IF) Metal Loth (F| Metoi Lath (G) PYROBAR*-2' Solid, or 3' Hallow %' Perf. ROCKLATH Porf. ROCXLATH tt# Perf. ROCXUTH H' Perf. ROCKLATH 2 layers LLLl Phis 1' 20-go. modi PARTITIONS Gypsum Sond 1:2, Gypeum Wood Fiber Gypsum-Sond 1:2, Gypsum-Perlite IOOt2'A Gypeum Vermieulite 1002ft Gypeum Sond Ii2, 1:3 Gypsum*Sond 1:2, 1:2 Gypeum Wood Fiber Gypeum VoroHCulito IWiJ'A, IOOiJ'A Gypsum-Sond 1:3 Gypeum*Sond h3 Gypsum.Send 1,2. 1:3 Gypeum'Sond 1:2, 1:2 Gyptum-Peribe 100:2, 100:3 Gypeum Sond 1.1, 1:2 Gypsum-Peribe 100,2. 100:3 Gypeum.Sond 1,2. 1:3 Gypeum-Sond 1,2. 1,2 Gypwm.Sond 1,1, 1,2 Gypeum Wood Fiber Gypeum-Peril*# 100,2, 100,3 Gypeum*Sond 1,2 or STRUCTO-UTE* obunos Gypsum-Sand 1,2 Gypsum-Perlite 100,2V* Gypsum Sond 1,2. 1:3 Gypsum Wood Fiber Gypsum Perlite 100:2^ or STRUCTO-UTE Gypsum-PeHbe 100:2'/^ or STRUCTO-UTE Gypsum-Perlite IOOi2(A or STRUCTO-UTE Gypsum Sond 1,2. 1,3 Gypsum Vermieulite 100,2, 100,3 Gypsum Wood Fibor Gypsum Vermieulite 100,2, 100,3 Gypsum Wood Fibor Gypsum-VermicuIHe 100:2. 100:3 Gypsum-Perlite 100,2. 100,3 fire Rated STRUCTO-UTE (Type "R"1 Fire Rated STRUCTO-UTE (Type "R"| ! j 1 i ! 1 1 ' i COLUMNS Gypsum-Sand 1,2, 1,3 Gypsum-Perlite 100:2, 100:3 Gypsum-Perlite 100:2. 100.3 Gypsum-Perlite 100:2, 100,3 Rre Rated STRUCTO-UTE (Type "IT) Gypsum Sond 1*3 Gypsum Sond 1:2 Gypsum-Sand 1.2VS Gypsum-Perlite 100,21/i Gypsum Perlite 100:2ft Gypsum-Perlite 100.2, 100.3 'A' 'A' 'A' 'V y.- Vi' 'A' V 2* 2'A' 2' 2' %' w 'V 1' Vi' 'A* 'A* H' A' H' H' %' 1' r ,* > i' %' "A* W' 1' IH' IV4' IV 'A' 'A' H' 1' i%' 1'A' 45 Minutes 1 Hour 1 Hour 1 Hour 1 Hour 45 Minutot 1 Hour 1 VS Hours 1 Hour 3 Hours 4 Hours 45 Minutes 1 Hour 2 Hours 1 Hour 1 Yi Hours AS MlmifM 1 Hour 1 Yi Hours 2 Hours 2 Hours 1 Hour 1 Hour 1 Hour 1 Hour 1 Hour 1 Hour 2 Hours 3 Hours 2 Hours 3 Hours 3 Hours 4 Hours 4 Hours 4 Hours 4 Hours 3 Hr. (Beam 4 Hr.| 3 Hours 1 Hour 2 Hours 3 Hours 4 Hours 4 Hours 4 Hours 1 Hour 1 ft Hours 2 Hours 3 Hours 4 Hours (A) Lath applied with 1 y/%*, 13 gauge nails, %' hood and joint* covered with Stripioth. 1 noil*. (8) Lath applied with 1 yh*. 11 gauge, r/n* h#ad barbed roofing nails, 6' O.C. (C) 2W reported concrete slab an Riblotfc or 2* precast gypsum Ml# above. (D) Coiling 9* or more b#iow floor dab. (EJ Coiling 3* or mors bslow Roar slab. (F) Seif-furring metal loth wrapped VVtight to column, or diamond mod on dionnel tram# not filled solid to column. (G) Loth furred at column comers with dtannaJs. TECHNICAL DATA---BASECOAT PLASTERS (1) PIASTER MIX COMPRESSIVE STRENGTH (PS-DRY) WRIGHT (Lb/C#. Ft. Dry) CONDUCTIVITY 44 K" STRUCTO-UTE (Regular) 1000 50 174 WOOD FIBER Neat 2000 77 3.15 CEMENT PLASTER."MIXED WITH: 1:1 1800 90 1:2 1065 103 5.51 1:3 650 102 5.60 100:2 900 48 1.64 100:3 550 11 1.31 Vermieulite 100.2 100:3 485 290 174 41 1.42 (1) Average Test Results. Figures May Vary Slightly For ProduOs From individual Mills. *T. M. R.g. U. S. Pat. Off. iiM UNITED STATES GYPSUM 7 FINISHING PLASTERS r LIME AND GAUGING LIME AND (White Coat) GAUGING PLASTERS CHAMPION* and STAR* White Gauging Plasters for blending with lime putty to provide initial set and strength. CHAMPION for fast set, STAR for slow set. Ground to blend readily and com pletely, minimizing risk of check cracking and crazing. Give strength and hardness to surface finish. Comply with ASTM Designation C28-55 and Federal Specification SS-P-402, Type G. RED TOP Gouging Available with slow or quick set. Distinguished from White Gauging Plasters by its darker color; otherwise the equal of CHAMPION and STAR in every respect. Complies with same ASTM and federal specifica tions. STRUCTO-GAUGE A new high strength gypsum gauging plaster for use with lime putty to produce surfaces of extreme hardness and durability. Has excellent mixing qualities, is easily applied, and needs minimum troweling to give a smooth finish. Complies with same ASTM and Federal Specifi cations with added requirement of compressive strength (neat) of not less than 5000 psi (dry). FINISHING LIMES Hydrated Finishing Lime (or Fin ishing Quicklime) is soaked (or slaked) to putty consistency, prop erly blended with gypsum gaug ing plaster, and troweled to a smooth, hard finish. Ease of appli cation, flexibility, whiteness, and economy make this by far the most widely used plaster finish coat. IVORY*. A double hydrated spe cial finishing lime that will not expand measurably in the wall. Requires no soaking to produce smooth, uniform, white, and high ly plastic putty. Complies with ASTM Designation C206-49 Types S and Federal Specification SS-L351, Type F, including the added requirement of not more than 8% unhydrated oxides. RED TOP and GRAND PRIZE* Nor mal Ohio dolomitic hydrated fin ishing limes. Comply with ASTM Designation C6, Type N, and Federal Specification SS-L-351, Type F, but not with specifica tions limiting unhydrated oxides to not more than 8 per cent. 'S RED TOP and CHESHIRE* High calcium finishing quicklimes. When properly slaked and aged at least 16 hours, hydration is virtually complete. Comply with ASTM C5 and Federal Specification SS-Q351, including added requirement of not more than 8% unhydrated oxides (when properly slaked). KEENE'S CEMENT RED TOP Keene's cement is a high strength, white gypsum plas ter. Keene's lime finish is com posed of lime putty blended with keene's cement in proportions re quired to obtain desired hardness. Complies with ASTM Designation C 61-40 and Federal Specification SS-C-161, Type I (Regular) and Type II (Quick Troweling). Regular Keene's sets slowly, re quires more troweling and may be used with any proportion of lime. Quick Troweling Keene's sets faster, requires less troweling and must be used with a minimum of 25 lbs. of dry hydrated lime per 100 lbs. of Keene's cement. ^ LIMITATIONS OF USE --FINISHES 1. All finishes (except ORIENTAL Exterior) should be used for interior application only, generally over a gypsum basecoat not exposed to water. If exposure to wetting is extreme or continuous use portland cement --lime plaster base-coat and finish. .2 Recommended proportions must be observed. Fail ure to use sufficient gauging plaster or Keene's, to blend thoroughly or to trowel adequately often results in check-cracking, crazing, lack of hardness and bond failure. 3. The use of gypsum gauged-lime finishes is not recommended over soft basecoats of low compressive strengths. Use sand float finishes. For smooth putty coat finishes over STRUCTO-LITE the addition of 25 lbs. of No. 1 white Silica Sand or Yi cubic ft. of perlite fines per 100# of Gauging Plaster is recom mended for improved working conditions and to minimize check cracking. 4. Where increased hardness and resistance to abrasion is required use STRUCTO-GAUGE, Keene's Cement or Gypsum Trowel Finish. (See technical data for relative hardness, Page 6). These finishes may be applied over Wood Fiber or Sanded Plaster Basecoats only. 5. Acoustical plasters are designed for use on ceilings and areas not exposed to rough usage. 6. Acoustical plasters are not recommended over radi ant heated panel areas due to low thermal conduc tivities. 7. ORIENTAL Exterior colored finish must be ap- plied to a Portland cement--lime basecoat only. o yj taj / ^ USG GYPSUM PLASTERS PREPARED GYPSUM RED TOP Gypsum Trowel and RED TOP GYPSUM Sand Float. Mill-prepared gypsum finish coat plasters which "require only the addition of water. There are no ASTM or Federal Specifications covering this type of plaster. RED TOP Gypsum Trowel Finish is used where hard, smooth finishes are desired. RED TOP Gypsum Sand Float Finish is used where a quality float finish is desired. Strength. Approximately twice the impact strength of ordinary limegauging finishes. Early decoration. May be painted as soon as plaster is set and dry. Nonalkaline. These finishes conf tain nothing injurious to paint or other decoration. COLORED ORIENTAL Interior. A mill pre pared, mill colored finish plaster which requires only the addition of water. There are no ASTM or Federal Specifications covering this type of plaster. Colors: White, with 81% light re flection for float finish; Pewter Gray, 52%; Surf Green, 56%; Desert Rose, 56%; Azure, 58%, Sahara Gold, 63%. Use on inte riors only for a finely floated sur face or special textured finish. Do not use for a smooth finish. Very great hardness protects against abrasion. ORIENTAL Exterior. A mill-pre pared stucco for exterior use over a portland cement-lime basecoat only; requires only the addition of water. Colors: Pewter Gray, Eggshell Ivory, Sun Tan, Stone Gray, Cop per Rose, Alamo Buff, Mission Cream, Cascade Green, Pueblo Tan, Indian Coral, Rancho Brown, White. Adaptable to any texture. Requires no decoration; mill prep aration of color eliminates risk of variation due to job addition. Not designed for smooth trowel finish. MOULDING PLASTERS Moulding Plasters are made for specialized work such as casting ornamental enrichments or run ning cornices. In cast work, mould ing plaster is used neat. For run ning cornice a small amount of lime is added. Moulding plaster is available in white and local grades and in quick or slow set. CASTING PLASTER RED TOP Superfine Casting Plaster is similar to RED TOP White Moulding Plaster, but with much finer particle size. Ideal for model ing done directly in plaster. The tiny particles assure smoother castings and excellent detail for fine plaques and art statuary. Re quires only the addition of water. ACOUSTICAL SABINITE*. A highly efficient acoustical plaster which produces a continuous trowel or float finish of excep tional sound absorbent qualities. Manufactured in four standard colors and white. Requires addition of water only. Incombustible. HI-LITE*. A highly efficient acoustical plaster with high light reflecting qualities; provides a stipple or stipple perforated finish. Has harder surface than c SABINITE; more suitable for side walls above wainscots which require sound conditioning. White only. Over 75% light reflection. Requires addition of *TJA. Reg. U.S. Pa*. Off. water only. Can be applied over either gypsum or Portland cement-lime basecoats. Adaptable for acoustical treatment of areas similar to swimming pool enclosures. AUDICOTE*. A prepared acoustical plaster requiring only the addition of water. May be applied by machine or by hand over gypsum plaster, portland cement-lime plaster, monolithic concrete sur faces that are clean and free of water-soluble materi als or oily film. Made in Satin White (65% light re flection) and Special White (70% light reflection). UNITED STATES GYPSUM 9 CS004 1594 hViVm specifications X: r Notes to Architect Select one or more of the following basecoat plasters, aggregates and finish coat piasters as desired or required to meet fire-resistant ratings. Where conductivity of the plaster is a factor, see limitations on Pages 3, 4, and 10. Where "contact," "furred" or "sus pended" lath and plaster ceilings are located under roof deck construction, it is recom mended that the space thus established be ventilated. Such ventilation, with or without vapor barrier and insulation, shall be de signed in accordance with accepted engi neering practice. I. Scop*. Unless otherwise specified or shown on the drawings, all walls and ceilings shall be plastered as herein de scribed. II. general PROVISIONS. In cold weather, the temperature of the building shall be maintained in the uniform range above 55' for an adequate period prior to the application of plaster, while the plaster ing is being done, and after the plaster is dry. The heat shall be well distributed in all areas, with deflection or protective screens used to prevent concentrated or irregular heat on plaster areas near source. When required, heat shall be furnished by Ventilation shall be provided to prop erly dry the plaster during and subsequent to its application. In glazed buildings, this shall be accomplished by keeping windows open sufficiently to provide air circulation; in enclosed areas lacking nor mal ventilation, provisions must be made to mechanically remove moisture laden air. If glazed sash are not in place and the building is subjected to hot, dry winds or temperature differentials from day to night of 20F or more, openings shall be screened with cheesecloth or similar ma terial. ill. GROUNDS. The minimum thickness of plaster over I6"x48' gypsum lath shall be 4"; over gypsum partition tile brick, clay tile or other masonry, it shall be 4' thick; over metal lath, the plaster thickness shall be s/%' measured from the face of the lath; and 14' over long length gypsum lath. Solid plaster partitions shall be (2'), (2 \df), (2 4'b (3"). (A greater thickness in grounds may be required for certain fire ratings. See table, page 7, and specify accordingly.) IV. MATERIALS. B*i* Coot riootor shall be (Structo-Lite), (Red Tor Cement Plas ter), (Red Top Wood Fiber Plaster , (Bondcrete) as manufactured by the United States Gypsum Company. Aggrogai* (for cement plaster), (wood fiber over unit masonry), shall be (sand), (perlite), 'vermiculitei meeting the re quirements of ASTM Designation C3554T--"Inorganic Aggregate for use in Interior Plastering." Aggrogato for job mixed sand float finish shall be a graded silica sand all passing a (30 mesh), (20 mesh) screen. Wator shall be clean, fresh and suitable for domestic consumption. For (Exterior Stucco Base), (Portland Cement-Lime plaster) the Portland Comont shall comply with A.S.T.M. Designation C150-47, the lim* shall be Mortaseal as manufactured by the United States Gyp sum Company, and the Sand shall be clean and sharp and shall meet the require ments of American Standards Association Specifications A42-2. Finish Coat Plattor shall be: a. Gypsum gauged lime putty trowel finish made from (Ivory Double Hy drated Lime), (Red Top Finishing Lime), Grand Prize Finishing Limei, and Champion Gauging Plaster >, i Star Gauging Plaster), (Red Top Gauging Plaster), as manufactured by the United States Gypsum Company. b. High strength Gypsum gauged lime putty trowel finish made from (Ivory Double Hydrated Lime), (Red Top Finish Lime), (Grand Prize Finishing Lime), and (Structo-Gauge), (Red Top Quick Trowelling Keene's Ce ment), as manufactured by the United States Gypsum Company. c. Red Top Gypsum Trowel Finish as manufactured by the United States Gypsum Company. d. Red Top Gypsum Sand Float Finish as manufactured by the United States Gypsum Company. e. Oriental Interior Colored Finish as manufactured by the United States Gypsum Company. f. A job mixed sand float finish made from Ivory Double Hydrated Lime, Red Top Keene's Cement and silica sand. g. (Sabinite), (Audicote), (Hi-Lite) Acoustical Plaster as manufactured by the United States Gypsum Company. h. Ornamental run mouldings made with Red Top Moulding Plaster and Ivory Double Hydrated Lime, and cast enrichments made with USG Casting Plaster, as required. i. Exterior finish coat shall be Oriental Exterior Colored finish as manufac tured by the United States Gypsum Company. V. SURFACE PREPARATION. a. Monolithic concrete to which Bond crete is to be applied shall be cleaned of all dust, loose particles and other for eign matter. Laitance and efflorescence shall be removed by washing with a 10% solution of commercial muriatic acid and water, and then cleaning with water to remove all traces of acid. Grease and oil shall be completely removed. Concrete surfaces shall have sufficient roughness to provide proper bond. If surfaces are not rough, they shall be hacked or bush-hammered, or dash coated with Portland cement grout composed of one part of cement and one and one-half parts of fine sand mixed to a mushy consistency. This coat shall be kept damp for at least two days immediately following its ap plication and then allowed to dry. Be fore application of the plaster, the surface shall be evenly dampened if necessary to reduce suction. b. Unit masonry surfaces that exhibit high suction shall be moderately wet ted immediately before plastering. c. Where Red Top Audicote acoustical plaster is indicated for application direct to smooth monolithic concrete, low reinforcing bar chair legs shall be galvanized. Bottom ends of high rein forced bar chairs shall be coated with rust inhibitive paint and use of nails or other raw steel against forms or surface of concrete held to a minimum. Where metal is exposed in spite of these pre cautions, and where AUDICOTE is to be applied directly against corner beads or casing beads, the metal shodld be treated with one coat of aluminum paint. VI. BASE COAT PROPORTIONS. . a. STRUCTO-LlTE shall be regular formula for all lath bases and masonry formula for masonry bases. b. Red Top Cement Plaster for the scratch or first coat over all lath bases in three-coat work shall be mixed in proportion of (one part of plaster to not more than two parts of sand by weight), (100 pounds of plaster to two cubic feet of perlite), (100 pounds of plaster to two cubic feet of vermiculite). Red Top Cement Plaster for all unit masonry surfaces and for the brown or second coat over lath bases shall be mixed in the proportion of 'one part plaster to not more than three parts sand by weight), (100 pounds of pias ter to three cubic feet of perlite', 100 pounds of plaster to three cubic feet of vermiculitei. Red Top Cement Plaster, when mixed for two-coat work over gypsum lath, shall be mixed in the proportion of lone part of gypsum to not more than 2 4 parts of sand by weight;, (100 pounds of gypsum to not more than 2 4 cubic feet of perlite), 1100 pounds of gypsum to not more than 2 4 cubic feet of vermiculitei. c. Red Top Wood Fiber Plaster. For ap plication over all types of lath, shall be mixed with water only. For masonry surfaces 1 except mono lithic concrete), the scratch and brown coats of wood fiber plaster shall have (one part of sand by weight), ione cubic foot of perlite per 100 pounds), (one cubic foot of vermiculite per 100 pounds) added. d. Bondcrete shall be mixed with clean water only. e. For (Exterior Stucco 1, (Portland Ce ment-Lime plaster), the scratch (first coat) shall be mixed in the proportion of one bag of Portland cement; two bags of Mortaseal ior two cubic feet of Time putty) and seven and one-half cubic feet of sand (approximately 45 No. 2 shovels). For application over stucco mesh or self-furring metal lath, approximately two pounds of fiber or hair shall be added to each mix of the above proportions. The brown coat (second coati shall be mixed in the proportion of one c L t/OOSD 1 C USG GYPSUM PLASTERS c c bag of Portland cement, two bags of Mortaseal ior two cubic feet of lime putty i and nine cubic feet of sand (approximately 55 Mo. 2 shovelsi. vil. GROUT. Grout for door frames and metal base shall be (Structo-Lite i, (Red Top Cement Plaster' and not more than (200 pounds sand i, (2 cubic feet of perlite) per bag of plaster.- VIII. MIXING OF BASE COATS. For hand mixing, the mixing boxes shall be water tight and thoroughly clean of all set or hardened material. All tools and equip ment shall be cleaned after mixing each batch. Do not mix more material than can be used in one hour. a. Structo-Lite shall be mixed with clean water only and hoed to uniform application consistency. b. Red Top Cement Plaster and aggre gate shall be mixed dry to a uniform color at one end of the box, hoed into the water at the other end and thor oughly mixed to proper consistency. c. Red Top Wood Fiber shall be mixed with clean water only and hoed to uniform application consistency. (For application over unit masonry aggre gate shall be added and dry mixed prior to adding water, i d. Bondcrete shall be mixed with clean water only and hoed to uniform ap plication consistency. For mechanical mixing, the mixer shall be cleaned of all set or hardened material before materials for a new batch are loaded. Each batch shall be mixed separately, not less than 2 minutes or more than 7 minutes, depending on the speed of the mixer. Material that has partially set shall not be retempered or used. Mix no more material than can be used in one hour. Mixers should be equipped with rubbertipped blades to keep partially set material from accum ulating in the barrel of the mixer. a. For Structo-Lite plaster, no aggre gate shall be added. Put the approxi mate amount of water in the mixer and add the Structo-Lite and mix to proper application consistency, adding water if necessary, and dump the en tire batch and use. b. Red Top Cement Plaster; put the ap proximate amount of water required in the mixer, then, while the mixer is in continuous operation, add approxi mately half the amount of aggregate required, add all of therslaster and add the remainder of the aggregate. Mix to proper application consistency, add ing water if necessary, and dump the entire batch. c. For Gypsum Wood Fiber Plaster: add the approximate amount of water re quired. Then add the plaster and mix to proper application consistency. d. For Bondcrete Plaster, add clean water only, then add the plaster and mix to proper application consistency. IX. GROUTING. a. All steel door frames in (solid lath and plaster partitions) 'steel stud parti tions! shall be fully grouted prior to lathing, leaving a groove to receive the lath. b. All 2 Vi' flush metal base for solid lath and plaster partitions and furred exte rior walls shall be grouted. Provide a V-Groove to receive ( Rocklath plas ter basei libs' Riblath). (Grout after channel studs are erected for channel stud metal lath partitions.) c. All metal base applied to masonry or stud partitions shall be grouted. X. BASE COAT APPLICATION. a. For two-coat work over gypsum lath and masonry, the base (first) coat shall be applied with sufficient material and pressure to form a good bond on the gypsum lath or masonry, as the case may be and to cover well, and then be doubled back to bring the plaster out to grounds, straightened to a true surface with rod and darby, and left rough, ready to receive the finish (second) coat. b. For three-coat work, the scratch (first) coat shall be applied with sufficient material and pressure to form good full keys on metal lath, and a good bond on gypsum as the case may be, and to cover well, and then be cross scratched to a rough surface. The brown (second) coat shall be applied after the scratch (first) coat has set firm and hard, brought out to grounds and straight ened to a true surface with rod and darby and left rough, ready to receive the finish (third) coat. c. For |2 solid gypsum lath and plas ter partitions, apply a scratch coat of plaster with a maximum 3-hour set, about !-s' thick, to each side of the lath. In no case, shall application of scratch coat to second side of lath be delayed longer than the setting time of the scratch coat applied to the first side. Scratch lightly in horizontal di rection only. After the scratch coats have set firm ly and have partially dried (but not less than 16 hours), the brown coat shall be applied to the unbraced side, bringing it out to within 1' of ground dimension for finish coat. When brown coat has set firmly (but not less than 3 hours), braces shall be carefully re moved from opposite side and brown coat applied to that side in a manner similar to that described for the other brown coat. d. For (2 \4') solid studless metal lath and plaster partitions apply scratch coat and allow it to set and partially diy. Then apply brown coat to side opposite braces, allowing it to set thoroughly before removing temporary braces. Next apply brown coat to previously braced side, bringing it out to sufficient thickness to bring overall partition thickness to grounds when finish coats are applied to both sides. e. For (2:i + ") channel stud, metal lath and plaster partitions apply scratch coat on lath side and allow it to set and partially dry. Then apply back-up coat on channel side to full grounds. H" over channels, in not less than two operations and allow to set. Next appiy brown coat on lath side bringing it out to sufficient thickness to bring overall partition thickness to grounds when finish coats are applied to both sides. f. For resilient Rocklath ceilings, three coat plaster work shall be used. Apply a full scratch coat, cross rake and al low to set. Then apply brown coat to bring total thickness of plaster to V over the lath, darby level and leave rough ready for finish coat. g. For Brace-tite system ceilings, apply Gypsum plaster in two or three coats to a thickness of 1 j". If two-coat method is used, the job setting time of the basecoat plaster shall not exceed three hours. A minimum period of 20 minutes shall be allowed between Scratch coat and double-back appli cations in two-coat plastering over both plain and perforated ROCK LATH plaster base. Proper heat and ventilation during plastering is manda tory for good two-coat performance. h. For (exterior wall furring) (hollow par titions) having long length Rocklath three-coat plaster work shall be used to a total thickness of over the lath. i. For column fireproofing total thickness of plaster over lath face shall be t 1 2'\ (5-6*), (l'\ (1 (1 :V''. Apply a full scratch coat, cross rake and allow to set. Then apply brown coat to within 111' of thickness required and leave level and rough ready for application of finish coat. j. Where plaster finish is flush with metal bases, door frames, window frames or similar constructions, both the brown coat and the finish coat should be grooved back at the intersection to re duce possibility of chipping of plaster at these points. k. At windows, doors and other openings all base coat plaster across head of opening and 12 inches down, each side, shall be cut free of frame or grounds with edge of trowel, after stiffening but before setting, to allow for expansion. l. Scratch coat of (Exterior stucco) (Port land cement --Lime plaster) shall be applied in a full *-j' coat, with sufficient pressure to form a good bond with masonry surfaces or to force it through and completely embed the metal rein forcement. Cross scratch and, after set, damp cure for not less than 48 hours. Brown coat shall be applied over the dampened scratch coat in a full V coat with sufficient pressure to form a good bond, rodded level and left rough, using a broom if necessary. After set, damp cure for at least 48 hours before applying the finish (third) coat. Damp curing of each coat shall be accomplished by applying water in a fine, fog spray. Apply only as much water as is readily absorbed. The ire- quency of spraying required will depend on the weather exposure, more frequent applications being required during hot, dry and windy weather. " 2 ^ ^ U! -0 Ch UNITED STATES GYPSUM 11 ram SPECIFICATIONS USG Gypsum Plasters r XI. PREPARATION OP UME PUTTY. IVORY Finishing Lime shall be mixed with clean water only, using approximately 6 gallons per bag. The putty may be pre pared by overnight soak, or by mixing by hand or machine. Run mixer for sufficient time to get a smooth, thoroughly mixed putty which can be used immediately or run into a box for use as required. When stored in a box after mixing, do not per mit putty to get crusty or to dry out. Mixer, tools and'equipment must be clean. XII. PROPORTIONS OF FINISH COATS. a. Gypsum gauged lime putty finish shall be mixed in the proportions of 100 pounds of gauging plaster to 200 pounds of dry lime 1400 pounds, or 34 gallons, of lime putty). Over light weight aggregate basecoats, add up to part (3 shovels) of fine Silica Sand, or up to '-4 cu. ft. of perlite fines, per 100 pounds of gauging plaster. b. Medium hard STRUCTO-GAUGE-Lime Putty Finish shall be mixed in the proportion of 100 pounds of (StructoGauge) to 200 pounds of dry lime (400 pounds, or 34 gallons, of lime putty). c. Hard STRUCTO-GAUGE-Lime Putty Finish shall be mixed in the porportion of 100 pounds of Structo-Gauge to 100 pounds of dry lime (200 pounds, or 17 gallons, of lime putty). d. Medium hard Keene's Cement-Lime Putty Finish shall be mixed in the pro portion of 100 pounds of Keene's Ce ment to 50 pounds of dry line (100 pounds, or gallons of lime putty). e. Hard Keene's Cement-Lime Putty Finish shall be mixed in the porportion of 100 pounds of Keene's Cement to 25 pounds of dpr lime (50 pounds, or Wi, gallons of lime putty). f. Keene's Cement-Sand Float Finish shall be mixed in the proportion of 100 pounds of Keene's Cement to 50 pounds of dry lime and 400 pounds of sand (100 pounds, or %Vi gallons of lime putty) and 4 to 5 cubic feet of sand (27 No. 2 shovels of sand). g. Red Top Gypsum Trowel Finish shall be mixed with clean water only to proper application consistency. h. Red Top Sand Float Finish shall be mixed with clean water only to proper application consistency. i. Oriental Interior Colored Finish shall be mixed with clean water only to proper application consistency. j. Oriental Exterior Colored Finish shall be mixed with clean water only to proper application consistency. XIII. APPLICATION OF FINISH COATS. Finish coat shall be applied over a partially dry, level and roughened gypsum base coat. The finish coat shall be scratched in thoroughly and immediately doubled back to fill out to a true, even surface. Thickness should be no more than Is'. (Except Acoustical Plaster which shall be 14' thick.") a. Trowel finishes shall be water troweled during and after set to provide a smooth, dense surface for decoration, free of irregularities and blemishes. b. Float finishes shall be floated with shingle, wood, carpet or rubber float to bring aggregate to the surface and produce a finish free of slick spots, cat faces, and other blemishes. In natural color finishes, use water sparingly while floating. Do not use water while float ing colored finishes. c. Textures shall be applied in such a manner that they will match the sam ple approved by the architect. d. Sabinite Acoustical Plaster finish shall be (Trowel) (Float) applied according to manufacturer's directions which are hereby made a part of this specifica tion. e. Hi-Lite Acoustical Plaster finish shall be (stipple-perforated) applied accord ing to manufacturer's directions, which are hereby made a part of this speci fication. f. Red Top Audicote Acoustical Plaster finish shall be (Spray Texture) (Float) (Stipple-perforated) (Trowel) applied according to manufacturer's directions which are hereby made a part of this specification. g. Ornamental plaster shall be executed in accordance with the full-sized de tails shown on the drawings. Cornices and moldings shall be run full, straight and true with molding plaster, using clean cut metal templets conforming to the profiles shown on the drawings. Lines shall be in alignment, with true intersections, and accurate mitres at corners and angles. Enriched ornamen tal work which cannot be run in place shall be cast with casting plaster in gelatine molds. The work shall be sol idly backed with jute or burlap, shall be properly reinforced with galvanized iron, and shall be securely stuck and wired in place with copper wires not lighter than 16 gauge. All joints shall be carefully made and neatly pointed so as to be invisible. All rough spots shall be eliminated with fine sand paper, and the entire work left in prop er condition, ready for decoration. h. Oriental Exterior colored finish shall be mixed and applied in strict accord ance with the manufacturer's direc tions. Color and texture to be desig nated and approved by the architect or his representative. XIV. PATCHING. Point up around trim and other work. Cut out and patch defective and damaged plaster. Patching of plaster shall match existing work in texture and finish and joinings with plaster previously applied shall finish flush and smooth. . XV. COMPLETION. At the completion of the finish plaster work, clean all plaster from beads, screeds, metal base and metal trim, leaving work ready for decoration by others. Remove all plaster rubbish from the building, leaving floors broom clean. Remove excess material from the job site. Remove all scaffolding, tools and other equipment from the building and job site. STRUCTO-UTE." "RED TOP," "BONDCRETE." "PYROBAR," "ROCK. LATH," "ORIENTAL." "SABINITE," "IVORY," "GRAND PRIZE," "MORTASEAL," "CHESHIRE." "CHAMPION," "STAR," "BRACE-TITE" "TRUSSTEEL." "HMJTE," "AUDICOTE" and "USG" ara ragittarad trad.-mork.; "STRUCTO-GAUGE" li a Irada-mark awnad by UnH.d Slot*. Gypsum and is usad by it te distinguish praducts af its manufactura. "STRUCTO-UTE" idanilflaa tha particular pisparsJ plostar manutacturad anly by Unitad Siotas Gypsum. "RED TOP" identifies tha particular plastars and flnlshas manufactured anly by Unitad States Gypsum. "BONDCRETE" idsntiflas tha particular plaster far concrete surfaces manufactured only by United Stotes Gypsum. "PYROBAR" Identifies the particular gypsum partition tile manufactured anly by Unitad States Gypsum. "ROCXLATH" idsntiflas the particular gypsum lath or plaster base manufactured only by United States Gypsum. "ORIENTAL" identifies the particular colored flnlshas manufactured only by United States Gypsum. "SABINITE," "AUDICOTE" and "HMJTE" idunflfy tha particular ocowilical plotters manufactured only by tho United States Gypsum Company. "IVORY** and "GRAND PRIZE** identify the particular hydrated lime manufactured only by the United States Gypsum Company. "CHESHIRE** identifies the particular high calcium finishing lime menu* factured only by United States Gypsum. "MORTASEAL" identifies the particular masonry lime manufactured by United States Gypsum. "CHAMPION** ond "STAR** Identify the particular white gauging pias ters manufactured only by the United States Gypsum Company. "STRUCTO-GAUGE*1 identifies the particular prepared gauging plaster manufactured only by United States Gypsum. "TRUSSTEEL" identifies the particular truss designed stud manufactured only by tho Unitod Statos Gypsum Company. "BRACE-TITE" identifies th# particular attachment clips manu factured only by tho Unitod Statos Gypsum Company. C5004 1597 I6LS UNITED STATES GYPSUM The Greatest Name in Building GENERAL OFFICES: 300 WEST ADAMS ST., CHICAGO 6, ILL. In Canada: CANADIAN GYPSUM CO, LTD, TORONTO--MONTREAL L GP-1