Document VKN7MY6de5rYe8RQ0w9q24k7K

PLAINTIFF'S EXHIBIT TECHNICAL INFORMATlO GYPSUM PLASTER BASE CO ATS & FINISHES FINISHING LIME & EXTERIOR STUCCO A IA FILE NUMBER 2 1 -A -2 A IA FILE NUMBER 2 1 -A -2 r c r r r r r- November, 1951 KrxncriHSi '' U n i t e d States Gypsum For Building For Industry Gypsum lime Steel Insulation Roofing Paint GENERAL OFFICES-300 WEST ADAMS STREET, CHICAGO 6, ILLINOIS ALBANY, N. Y. ATLANTA, GA. BALTIMORE, MD. BIRMINGHAM, ALA. BOSTON, MASS. BUFFALO, N. Y. charlotte, n. c. CHICAGO, ILL. CINCINNATI, O. CLEVELAND, 0. DALLAS, TEX. DENVER, COLO. DETROIT, MICH. GRAND RAPIDS, MICH. HARRISBURG, PA. HOUSTON, TEX. INDIANAPOLIS, IND. JACKSONVILLE, FLA. KANSAS CITY, MO. LOS ANGELES, CALIF. MILWAUKEE, WlS. MINNEAPOLIS, MINN. NEWARK, N. J. NEW HAVEN, CONN. NEW YORK, N. Y. OAKLAND, CALIF. OKLAHOMA CITY, OKLA. OMAHA, NEBR. PHILADELPHIA, PA. PHOENIX, ARI2. PITTSBURGH, PA. PORTLAND, ORE. PROVIDENCE, R. 1. RICHMOND, VA. ST. LOUIS, MO. SACRAMENTO, CALIF. SALT LAKE CITY, UTAH SAN FRANCISCO, CALIF. SEATTLE, WASH. SYRACUSE, N. Y. WASHINGTON, D. C. CO 03 o ro ro co -P* "RED TOP," "BONDCRETE," "PYROBAR," "ROCKLATH," "ORIENTAL," "SABINITE," "IVORY," "GRAND PRIZE," "CHAMPION," "STAR," "TRUSSTEEL" and "USG" are registered trade-marks owned by United States Gypsum Company and are used by it to distinguish products of its manufacture. "RED TOP" identifies the particular plasters and finishes manufactured only by the United States Gypsum Com pany. "BONDCRETE" identifies the particular plaster for con crete surfaces manufactured only by the United States Gypsum Company. "PYROBAR" identifies the particular gypsum partition tile manufactured only by the United States Gypsum Company. "ROCKLATH" identifies the particular gypsum lath or plaster base manufactured only by the United States Gypsum Company. "ORIENTAL" identifies the particular colored finishes manufactured only by the United States Gypsum Com pany. "SABINITE" identifies the particular acoustical plaster manufactured only by theUnited States Gypsum Company. "IVORY" and "GRAND PRIZE" identify the particular hydrated lime manufactured only by the United States Gypsum Company. "CHAMPION" and "STAR" identify the particular white gauging plasters manufactured only by the United States Gypsum Company. "TRUSSTEEL" identifies the particular truss designed stud manufactured only by the United States Gypsum Company. The Colored Stripes are Reg. U. S. Pat. Off. Note to Architects: Where "contact," "furred" or "suspended" lath and plaster ceil ings 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 designed in accordance with accepted engineering practice. AP-2 Rev. I1-19S1 Copyright 1948 United Stotes Gypsum Company Page 2 BB021 2435 BASECOAT PLASTERS RED TOP* CEMENT PLASTER DESCRIPTION RED TOP Cement Plaster is a neat gypsum plaster re quiring the addition of an aggregate and water on the job. It is the basecoat that receives the finish coat plaster. Complies with ASTM Designation C28-50 for "Gyp sum Neat Plaster" and Federal Specification SS-P-402, Type N. FUNCTION AND UTILITY Red Top Cement Plaster is used for scratch (1st coat) and browm (2nd coat) wherever good plastering aggre gate is available. Fireproof--Made from gypsum rock, it is incombustible and will not transmit high temperatures until completely calcined; a slow process. In this respect, gypsum plaster is unique. See fire test data page 8, for authoritative fire ratings. Adaptable--RED TOP Cement Plaster bonds firmly with ROCKLATH* plaster base, metal lath, fiber in sulation lath, PYROBAR* gypsum partition tile, clay tile, porous brick and certain other approved plaster bases. RED TOP Cement Plaster is the standard of excellence for receiving such finish coats as lime putty, keene's cement, gypsum trowel finish, gypsum float finish, ORIENTAL* interior colored finish, gypsum acoustical plasters, etc. It is an excellent base for adhesive applica tion of acoustical tile. RED TOP Cement Plaster is plastic, permitting wide latitude in its use for plain or curved surfaces. Uniform--RED TOP Cement Plaster is manufactured on a nation-wide basis within narrow limits of tolerance.. Its "stabilized set" minimizes the hazards due to impure water or aggregate and job conditions. Its set is ad justed for seasonal conditions. Strong--When mixed with good sand according to specifications, RED TOP Cement Plaster has a compres sive strength up to 1,200 lbs. psi for normal mixes (see test data, page 8). It is capable of withstanding normal wear and usage for the life of the building. Economical--RED TOP Cement Plaster is lowest in cost of the various types of gypsum basecoats because: The neat plaster is low in cost and is mixed with eco nomical aggregate which increases bulk and coverage. RED TOP Cement Plaster is highly plastic, thus is easily and quickly applied by the mechanic. Normal usage requires little or no maintenance. LIMITATIONS OF USE 1. RED TOP Cement Plaster should have aggregate added strictly according to specifications. Use of too much aggregate drastically decreases its strength. Sand content is easily calculated. A No. 2 shovel full of damp sand weighs approximately 15 lbs. The light weight ag gregates are generally shipped in 3 or 4 cu. ft. bags. 2. Under no conditions should RED TOP Cement Plas ter be applied to concrete. Use BONDCRETE* Plaster, described on page 7. 3. RED TOP Cement Plaster should not be used where contact with excessive water or moisture is expected. In such instances, use portland cement-lime plaster. 4. RED TOP Cement Plaster is an interior basecoat plaster and should not be used on the exterior where exposed to the elements. 5. Because bituminous compounds do not provide an ideal base for gypsum plaster basecoats, placer applica tion on masonry walls and concrete that have been coated with these compounds is not recommended. .6 Due to possibility of condensation or W'ater seepage, plastering direct to interior side of exterior masonry walls is not recommended. Furring such walls prior to plastering is recommended. 7. When used in conjunction with radiant heating sys tems, the temperature at the surface of the plaster shall not exceed 115 Fahrenheit. The thermal conductivity of gypsum-sand plaster is approximately three times that of a gypsum-lightweight aggregate mix. * Trademarks Reg. U. S. Pat. Off. Page 3 BB021 2436 c BASECOAT PLASTERS c PLASTERING SPECIFICATIONS (FOR RED TOP CEMENT PLASTER) c GENERAL PROVISIONS In cold weather start to heat the building well in advance of plastering and maintain a uniform temperature in the range of 55 to 70 F. in the building until the plaster is dry. Ventilation shall be provided to eliminate excessive moisture in the building. In hot, dry weather, all open ings shall be closed with sash or cloth during the appli cation of plaster. No plaster shall be allowed to dry before setting. lbs. of gypsum plaster to 3 cu. ft. of vermiculitef or perlite. For Two-Coat Work over masonry surfaces (not mono lithic concrete) the basecoat (scratch double back) shall be mixed in the proportion of one part plaster to three parts sand by weight or 100 lbs. of plaster to 3 cu. ft. of vermiculitef or perlite. When perlite is used as the aggre gate over masonry and it is impractical to reduce suction by wetting, the amount of perlite may be increased to not more than 4 cu. ft. SCOPE Unless otherwise specified or shown on drawings, all walls and ceilings shall be plastered as herein described. MATERIALS Basecoat plaster shall be RED TOP Cement Plaster manufactured by the United States Gypsum Company (except that the scratch coat over metal lath shall be fibred RED TOP Cement Plaster). (Note to Architect)--In scratch double back application of gypsum cement plaster to gypsum lath or fibre insulation lath the aggregates and the proportions shall be as follows: Two-Coat Work, over gypsum lath or fibre insulation lath, shall be in the proportion of one part gypsum cement plaster to not more than 2 14 parts of sand by weight (17 No. 2 shovels of damp sand per 100-pound bag of plaster) or 100 pounds of gypsum plaster to not more than 2V^ cubic feet of vermiculitef or perlite. Aggregate--(Note to Architect--Select one or more of the following aggregates as desired or required to meet fire resistance rating.) Where conductivity of the plaster is a factor, see limitation 7 on page 3. Sand--Shall be clean and sharp, complying with ASTM designation C35-39. APPLICATION OF BASECOATS (Note to Architect). Three-coat work is the preferred plaster specification, because it is more conducive to application to full grounds. It may be used throughout the job except over masonry where 2-coat work is preferred. Three-coat work should always be required over metal lath, long length Vermiculite--Shall be standard plaster aggregate com ROCKLATH and Resilient ROCKLATH or similarly supported plying with ASTM Designation C35-39 for particle size ceilings. and shall weigh between 7/4 and 10 pounds per cubic foot. Perlite--Shall be standard plaster aggregate complying with ASTM Designation C35-39 for particle size except not more than 10% through 100 mesh and shall weigh between 7% and 15 pounds per cubic foot. Three-Coat Work--Scratch (first) coat shall be applied with sufficient material and pressure to form good full keys on wood and metal lath, wire lath and wire fabric, and good bond on gypsum or fibre insulation lath, as the case may be, and to cover well, and then be scratched to rough surface. Water--Shall be clean, fresh and suitable for domestic consumption. Finish Plaster--(Note to Architect--Select the desired finish from pages 9 to 14, and insert herein the applicable Brown (second) coat shall be applied after the scratch (first) coat has set firm and hard, brought out to grounds and straightened to a true surface with rod and darby, and left rough, ready to receive the finish (third) coat. materials.) Two-Coat Work--Base (first) coat shall be applied with sufficient material and pressure to form good bond on GROUNDS gypsum or fibre insulation lath or masonry, as the case The total plaster thickness over gypsum lath, gypsum partition tile or fiber insulation lath, shall be Vi"\ over brick, clay tile or other masonry, it shall be W thick and over metal lath the plaster thickness shall be Y%" measured from the face of the lath. (Gi eater thickness in grounds may be required for certain fire ratings. See may be, and to cover well, and then be doubled back to bring the plaster out to grounds, straightened to true surface with rod and darby and left rough, ready to re ceive the finish (second) coat. To avoid excess suction and dry-outs, it is preferable to moderately wet masonry surfaces before plastering. table, page 8.) MIXING OF BASECOATS For Three-Coat Work, the scratch or first coat over all lath shall be mixed in the proportion of one part plaster to not MIXING AND APPLICATION OF FINISHES Use the applicable finish coat specifications selected from pages 9 to 14. more than two parts sand by weight (13 No. 2 shovels of damp sand per 100-lb. bag of plaster) or 100 lbs. of gyp GENERAL NOTES sum plaster to not more than 2 cu. ft. of vermiculitef or Where plaster is to finish flush with metal bases, bucks, perlite. The brown or second coat over all lath shall be window frames or similar constructions, both the brown mixed in the proportion of one part gypsum plaster to coat and the finish coat should be grooved back at the not more than three parts sand by weight (20 No. 2 intersection to reduce possibility of chipping of plaster co shovels of damp sand per 100-lb. bag of plaster) or 100 at these points. ro Page 4 t Vermiculite aggregate is not recommendedfor plastering overfibre insulating lath. ro -t* to c ( c c c c c c ( ( c c c c c c e c BASECOAT PLASTERS RED TOP WOOD FIBER PLASTER DESCRIPTION RED TOP Wood Fiber Plaster is a factory-prepared gypsum basecoat plaster containing finely-shredded, se lected wood fiber. It requires the addition of water only on the job. Complies with ASTM Designation C28-50 "Gypsum wood-fibered plaster" and Federal Specifications SS-P402, Type W. FUNCTION AND UTILITY Stronger--Compared to plaster sanded 1:3, Wood Fiber Plaster has: 3 times greater compressive and tensile strength. 2Vi times greater resistance to lateral impact. 50 per cent greater surface hardness. Consequently, has greater resistance to cracking. Fireproof--Generally 50 per cent more fire resistant than sanded plaster. See ratings on page 8. Factory Prepared--Particularly suitable where good ag gregates are unavailable. Avoids dangers of improper proportioning of aggregates. Lightweight-*-Dead load is 25 per cent lighter than sanded plaster. Cost--A wood fiber basecoat plaster job costs approxi mately 10 to 15 per cent more than RED TOP Cement Plaster sanded on the job. LIMITATIONS Same as paragraphs 2, 3, 4, 5, 6 and 7 under Limitations for use of RED TOP Cement Plaster, page 3. PLASTERING SPECIFICATIONS (FOR RED TOP WOOD FIBER PLASTER) GENERAL PROVISIONS In cold weather start to heat the building well in advance of plastering and maintain a uniform temperature in the range of 55 to 70 F. in the building until the plaster is dry. Ventilation shall be provided to eliminate exces sive moisture in the building. In hot, dry weather, all openings shall be closed with sash or cloth during the application of plaster. No plaster shall be allowed to dry before setting. SCOPE Unless otherwise specified or shown on drawings, all walls and ceilings shall be plastered as herein described. MATERIALS Basecoat plaster shall be RED TOP Wood Fiber Plaster manufactured by United States Gypsum Company. Finish Plaster (Note to Architect--Select the desired finish from pages 9 to 14, and insert herein the applicable materials). GROUNDS The total plaster thickness over gypsum lath, PYROBAR gvpsum partition tile or fiber insulation lath shall be Yi"\ over brick, clay tile or other masonry, it shall be H" thick, and over metal lath the plaster thickness shall be Vt" measured from the face of lath. MIXING AND APPLICATION On all types of lath, RED TOP Wood Fiber Plaster shall be mixed with water only on the job. The scratch and brown coats over masonry surfaces (except monolithic concrete), shall be mixed in the proportion of 1 part Wood Fiber Plaster to 1 part sand by weight (7 No. 2 shovels ofdamp sand per 100-lb. bag Wood Fiber plaster). The scratch coat of plaster shall be applied to a thick ness of approximately W with sufficient pressure to form a good bond. Cross rake and allow to set. When partially dry, apply the brown or second coat to full grounds, allowing approximately He" for the finish coat. Rod and darby to a true and level surface and broom to leave surface rough for finish coat. All porous masonry surfaces shall be moderately wetted to provide proper suction before plastering. Brown (second coat) shall be applied after the scratch (first coat) has "taken up," but before it sets. OPTIONAL INCLUSION At the option of the contractor, all brown coats may be applied to the unset scratch coat (scratch double back), except when plastering over metal lath, long length ROCKLATH, Resilient ROCKLATH ceilings or similar edge supported gypsum lath ceilings. MIXING AND APPLICATION OF FINISH COAT PLASTER Use the applicable finish coat specifications selected from pages 9 to 14. Page S BB021 2438 BASECOAT PLASTERS RED TOP SANDED PLASTER DESCRIPTION RED TOP Sanded Plaster is a factory-sanded gypsum basecoat plaster requiring the addition of water only, on the job. Complies with ASTM Designation C28-50 for "Gyp sum Ready-sanded Plaster" and Federal Specification SS-P-402, Type S (scratch coat) or Type B (brown coat). FUNCTION AND UTILITY RED TOP Sanded Plaster is particularly suitable where good plastering sand is not available. It provides all those features described for RED TOP Cement Plaster, plus the following: Factory Sanded -- Properly selected aggregate correctly proportioned and machine-mixed. Cost--Slightly higher than job-sanded RED TOP Ce ment Plaster, but more economical than other gypsum basecoat plasters. LIMITATIONS OF USE Same as paragraphs 2, 3, 4, 5, 6 and 7 of Limitations of Use under RED TOP Cement Plaster, page 3. PLASTERING SPECIFICATIONS (FOR RED TOP SANDED PLASTER) GENERAL PROVISIONS In cold weather start to heat the building well in advance of plastering and maintain a uniform temperature in range of 50 to 70 F. in the building until the plaster is dry. Ventilation shall be provided to eliminate excessive moisture in the building. In hot, dry weather, all open ings shall be closed with sash or cloth during the appli cation of plaster. No plaster shall be allowed to dry before setting. SCOPE Unless otherwise specified or shown on drawings, all walls and ceilings shall be plastered as herein described. MATERIALS Basecoat Plaster shall be RED TOP Sanded Plaster manufactured by United States Gypsum Company. Over masonry, RED TOP Sanded Plaster (for masonry) shall be used. Finish Plaster (Note to Architect -- Select the desired finish from pages 9 to 14, and insert herein the applicable materials). GROUNDS The total plaster thickness over gypsum lath, PYROBAR gypsum partition tile or fiber insulation lath shall be J4>"; over brick, clay tile or other masonry it shall be Vs" thick, and over metal lath the plaster thickness shall be H" measured from the face of the lath. MIXING AND APPLICATION Sanded plaster shall be mixed with water only. The scratch coat of plaster shall be applied to a thickness of approximately M" with sufficient pressure to form a good bond. Cross rake and allow to set. When partially dry, apply the brown or second coat to full grounds, allowing approximately b$" for the finish coat. Rod and darby to a true and level surface and roughen slightly. All porous masonry surfaces shall be moderately wetted to provide proper suction before applying scratch coat. Brown (second coat) shall be applied after the scratch (first coat) has "taken up," but before it sets. OPTIONAL INCLUSION At the option of the contractor, all brown coats may be applied to the unset scratch coat (scratch double back), except when plastering over metal lath, long length ROCKLATH, or Resilient ROCKLATH ceilings or similar edge supported gypsum lath ceilings. MIXING AND APPLICATION OF FINISH COAT PLASTER Use the applicable finish coat specifications selected from pages 9 to 14. Page 6 BB021 2439 BASECOAT PLASTERS bondcrete* plaster DESCRIPTION RED TOP BONDCRETE is a gypsum basecoat plaster specially formulated to bond with rough interior mono lithic concrete surfaces. It is factory prepared, requiring addition of water only on the job. There are no ASTM or Federal Specifications cover ing this type of plaster. FUNCTION AND UTILITY BONDCRETE is plaster especially prepared for appli cation to concrete. It provides the bonding plaster to receive a browning, or leveling, coat of RED TOP Cement Plaster or Wood Fiber Plaster when necessary. If a leveling coat is unnecessary, the finish plaster may be applied directly to the BONDCRETE. Bonding Strength--BONDCRETE adheres well to prop erly prepared concrete surfaces. See Surface Preparation under Specifications for proper conditioning of concrete surfaces. This is important. The thermal coefficient of expansion of BONDCRETE is approximately the same as for concrete. Low Cost--An economical bonding coat to provide for the application of plaster direct to concrete surfaces. LIMITATIONS OF USE 1. BONDCRETE should be used only on concrete that is properly prepared for plastering. It should never be applied to smooth concrete. (See RED TOP Cover Coat, page 13.) 2. Maximum thickness of BONDCRETE and basecoat shall not exceed H" on ceilings or %" on walls. If addi tional thickness is required, metal lath shall be secured to the concrete surfaces. 3. The same as paragraphs 3, 4, 5, 6 and 7 under RED TOP Cement Plaster, page 3. PLASTERING SPECIFICATIONS (FOR RED TOP BONDCRETE PLASTER) 1. Under Materials of the Plastering Specifications, in clude the following: Basecoat for plastering over concrete surfaces shall be BONDCRETE manufactured by United States Gypsum Company. 2. Under Mixing and Application, include the following: Mix BONDCRETE with water only. Concrete surfaces to receive plaster shall be properly prepared as specified elsewhere. Surfaces of walls and columns shall have a scratch coat of bond plaster, followed by a brown coat of gypsum plaster (in the proportions of 1 part of gypsum neat plaster to not more than 3 parts of sand, by weight) trowelled into the scratch coat before it has set. The brown coat shall be brought out to grounds, straightened to a true surface with rod and darby, and left rough, ready to receive the finish coat. Total thickness of plaster not to exceed H". Concrete ceilings shall have a coat of bond plaster scratched in thoroughly, doubled back, and filled out to a true, even surface and left rough by brooming, ready to receive the finish coat. Total thickness of plaster not to exceed Js". If additional thickness of plaster is required, metal lath shall be secured to the concrete surface. *Trademark Reg. U.S. Pat. Ojf, 3. A separate paragraph must be included as follows: Surface Preparation.--Monolithic concrete surfaces shall be cleaned of all dust, loose particles, and other foreign matter. Laitance and efflorescence shall be removed by washing first with a 10 per cent solution of commercial muriatic acid and water and then with clean water to remove all traces of acid. Grease and oil shall be com pletely removed. (Note to Architect: A smooth concrete surface resulting from pouring on smooth forms, or vibrating of concrete, is an improper base for BONDCRETE application. See Red Top Cover Coat, page 13.) Concrete surfaces shall have sufficient roughness to provide proper bond. If surfaces are not rough, they shall be hacked or bush-hammered, or a dash-coat of portland cement grout, composed of 1 part of cement and \lA parts of fine sand mixed to a mushy consistency, shall be applied. Using a stiff fiber brush, the portland cement grout shall be forcibly dashed on the concrete surface with a whipping motion. This coat shall be kept damp for at least 2 days immediately following its application and then allowed to dry. Before application of the plaster, the surface shall be evenly dampened if necessary to reduce suction. Page 7 BB021 2440 BASECOAT PLASTERS TECHNICAL DATA --AVERAGE TEST RESULTS COMPRESSIVE STRENGTH --psi (dry) TENSILE STRENGTH --psi (dry) COST FACTOR, LABOR & MATERIAL MIX: WOOD FIBER Neat 2600 440 100 1:1 2100 245 95 SAND 1:2 1200 170 93 FIRE TEST DATA(I) CEMENT PLASTER VERMICULITE 1:3 100:2 100:3 750 500 300 120 130 90 90 95 95 PERLITE 100:2 100:3 1000 650 165 105 95 95 CONSTRUCTION PANEL TYPE TYPE BASE PLASTER & AGGREGATE THICKNESS RATING AND REFERENCE Wood Frame Wood Frame Wood Frame Wood frame Wood frame Wood Frame Wood Frame Wood Frame Wood Frome 3" Hollow PYROBAR 4" Hollow PYROBAR Solid Solid Solid Solid Solid Solid TRUSSTEEL Stud TRUSSTEEl Stud TRUSSTEEL Stud TRUSSTEEl Stud TRUSSTEEl Wood Frame Wood Frame Wood Frame Wood Frame Wood Frame Steel Joist 1C) Stee 1 Joist fCl Sfee 1 Joist (Cl Stee 1 Joist (Cl Stee 1 Joist 1C) Cellular Steel Floor Cellular Steel Floor Cellular Steel Floor Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section %" ROCK LATH Plain %" ROCKLATH Plain %' Perf. ROCKLATH %" Perl, ROCKLATH %" Perf. ROCKLATH Meta 1 lath Meta 1 lath Meta 1 lath Metal Lath Metal lath Meta 1 Lath Meta 1 lath Meta l loth ROCKLATH ROCKLATH Meta l lath Meta I lath Meta 1 Loth Meta 1 loth Metal Lath 3/s" Perf. ROCKLATH %" Perf. ROCKLATH (At %" Perl. ROCKLATH Metal lath (B) Meta 1 Lath W Perf. ROCKLATH and Brace-Tife System Meta 1 Lath Metal Lath Meta i Lath Meto 1 lath Metal Lath (D) Meta 1 Lath (El Metal Lath (El Metal lath Metal lath (F) Metal lath (F) Metal lath (F) Metal lath (F) Pyrobar-2ff Solid, or 3'' Hollow V Perf. ROCKLATH Z" Perf. ROCKLATH V' Perf. ROCKLATH 2 thicknesses of VS" Long Length ROCK LATH, plus 1" 20 go. Hex. Mesh Wire PARTITIONS Gypsum-Sand 1:2, 1:2 Gypsum Wood Fiber Gypsum-Sand 1:2, 1:2 Gypsum-Perlite 100:2/2 Gypsum-Vermiculite 100:2/2 Gypsum-Sand 1:2, 1:3 Gypsum-Sand 1:2, 1:2 Gypsum Wood Fiber Gypsum-Vermiculite 100:2/2, 100:3/2 Gypsum-Sand 1:3 Gypsum-Sand 1:3 Gypsum-Sand 1:2, 1:3 Gypsum-Sand 1:2, 1:2 Gypsum-Perlite 100:2, 100:3 Gypsum Wood Fiber Gypsum-Sand 1:1, 1:2 Gypsum-Perlite 100:2, 100:2/2 Gypsum-Sand 1:2, 1:3 Gypsum-Sand 1:2, 1:3 Gypsum-Sand 1:2, 1:2 Gypsum Wood Fiber Gypsum-Perlite 100:2, 100:3 CEILINGS Gypsum-Sand 1:2 Gypsum-Sand 1:2 Gypsum-Perlite 100:2/2 Gypsum-Sand 1:2, 1:3 Gypsum Wood Fiber Gypsum-Perlite 100:2/2 Gypsum-Sand 1:2, 1:3 Gypsum-Vermiculite 100:2, 100:3 Gypsum Wood Fiber Gypsum-Vermiculite 100:2, 100:3 Gypsum Wood Fiber Gypsum-Vermiculite 100:2, 100:3 Gypsum-Perlite 100:3, 100:3 COLUMNS . Gypsum-Sand 1:2, 1:3 '. Gypsum-Vermiculite 100:2, 100:3 * Gypsum-Vermiculite 100:2, 100:3 Gypsum-Perlite 100:2, 100:3 Gypsum-Perlite 100:2, 100:3 Gypsum-Sand 1:3 Gypsum -- Sand 1:2/2 Gypsum--Sand 1:2/? Gypsum -- Perlite 100:21/2 Gypsum -- Perlite 100:2/2 Gypsum -- Perlite 100:2, 100:3 1/2 " Zi" y2" Zi" Vi" V," y." -A " /2 2" 2" 2/5" 214" 2" 2" y/ %" Zi" 1" Zi" Zi" V2" z<" %" Zb" 1" 3// y/ 1" 1" i" r 1" %" 1" 1/2" 1" . 1Z2" '/, " Z2" Zb" 1" 1" l'/2" 45 Minutes f 1) 1 Hour {1J 1 Hour (1) 1 Hour (1) (2) (31 1 Hour (1) 45 Minutes HI I Hour (1) 1 Vi Hours (I) 1 Hour (2) 3 Hours (31 4 Hours (3) 45 Minutes (1) 1 Hour (3) 2 Hours 121 2 Hours tl) 1 Hour (3) I/2 Hours (11 45 Minutes f 11 1 Hour (1) 1 Hour (1) 2 Hours (1) 2 Hours (3) 45 Minutes (I) (2) 1 Hour (1) 1 Hour (1) 1 Hour (1) I Hour (2) 1 Hour (1) 1 Zi Hours (11 2 Hours 111 3 Hours (1) 3 Hours (1) 4 Hours 11) 4 Hours (U 4 Hours III 4 Hours (21 1 Hour (1) 3 Hours (2) 4 Hours 12) 3 Hours (2) 4 Hours (2) 4 Hours (1) 1 Hour (1) 1 Vi Hours (1) 2 Hours (1) 3 Hours (l) 4 Hours (1) (I) Notional Bureou of Standards. (2) Underwriters' laboratories. (3) Nationally recognized fire testing laboratory--name on request. (A) lath applied with I Ve ", 13 gauge nails, 3/b" head and joints covered with Striplafh. 1 3/a" nails. (B) loth applied with 1 Zi ", 11 gauge, Jhead barbed roofing noils, 6" O.C. (C) 2/2" reinforced concrete slab on Ribiafh or 2" precast gypsum tile above. ID) Ceiling 9" or more below floor slab. IE) Ceiling 3" or more below floor slab. IF) Metal Lath spaced minimum of 1 /a " from column. CXJ CO O FINISHING PLASTERS DESCRIPTION The finish coat plaster provides the base for final wall or ceiling decoration. It is applied to a thickness of ho" to Is", usually over a gypsum plaster basecoat. Several types of finish coats are available, each with characteristics to serve specific requirements, and generallv classified according to the principal cementitious ingredient as follows: 1. Lime and Gauging, commonly known as "white coat" for a smooth white trowel finish. It consists of lime, soaked to a smooth putty, and mixed with gypsum gauging plaster. With addition of sand, is adaptable for sand float finishes. The three essentials to a good white coat job are: a. Lime must be highly plastic and completely hydrated. b. Correct proportioning of gauging plaster to lime putty (see specifications) and thorough blending of ingredients. c. Careful application and sufficient trowelling to pro duce a smooth glossy surface. 2. Lime and Keene's--forextra hard smooth white trowel finish. With addition of sand, is adaptable for sand float finishes. Also available mill mixed and colored under "ORIENTAL"* Interior Finish brand. 3. Gypsum--Trowel (smooth), or sand float prepared finishes. 4. Acoustical Plaster--(SABIXITE*), for sound absorp tion. (Sec page 14.) ESSENTIALITY OF COMPLETE HYDRATION IN DOLOMITIC FINISHING LIMES Some years ago an exhaustive investigation was under taken by the National Bureau of Standards in co-operation with several architects and lime manufacturers to deter mine reasons for "lime bulges" (delamination of finish from basecoat) occurring on many government and private buildings. The failures investigated occurred on surfaces which had been "white coated" with dolomilic hydrated finishing limes from the Ohio fields, which have been widely used. Failures often occur 5 or 10 years after erection of the buildings. After much analysis, it was the consensus of opinion that the delayed hydration and attendant expansion of unhydrated oxides in the "normal" dolomitic finishing limes resulted in bulging and delamination. To correct this difficulty. L:nited States Gypsum Com pany took the lead in developing "IVORY"* Double Hydrated finishing lime, a "fully" or "pressure" (less than 8 per cent unhydrated) hydrated Ohio dolomitic finishing lime. ASTM specifications C206-49 for special finishing lime and proposed amendments to Federal specifications, have been written to cover 92 per cent hydrated limes; a specification has been published by the National Lime Association. This type of finishing lime is required by ASA Specifications for Gypsum Plastering, A42.1-1950. Note that all high calcium hydrated limes (properly soaked) comply with these requirements as do high calcium quicklimes (properly slaked). TECHNICAL DATA--FINISH PLASTERS Mix by weight of dry materials: Color GAUGING PIASTER TO LIME QUICK TROWELLING KEENE'S TO LIME * 1:2 2:1 4:1 Medium Hard Hard White White White GYPSUM TROWEL FINISH GYPSUM FLOAT FINISH ORI ENTAL FINISH NEAT NEAT NEAT White 12 White or Gray Colors Finish Texture Smooth Smooth Smooth Smooth Float Float Hardness in Kilograms (L) Workability 34 50 70 55 (t) (t) 1 4 5 236 Cost Factor Labor & Mat'l. 100 170 180 125 125 160 (jl Kilograms required to force a 10MM ball .OF' into plaster face. 1+1 These are hard finishes but the aggregate in the surface does not permit an indication with this test. 7rademark /leg. L' S. /`at. Off. Page 9 BB021 2442 FINISHING PLASTERS LIME PUTTY - GAUGING (WHITE COAT) FINISH DESCRIPTION Hydrated Finishing Lime (or Finishing Quicklime) is soaked (or slaked) to putty consistency, blended in proper proportion with gypsum gauging plaster, and is trowelled to a smooth, hard finish usually over a properly prepared gypsum basecoat. This is by far the most widely used plaster finish coat due to ease of application, flexibility, whiteness and economy. FUNCTION & UTILITY OF INGREDIENTS LIMES: The function of lime in a finish plaster is to provide the "spread" and plasticity to permit fast, easy application with full flexibility and economy. Lime does not "set," but hardens slowly; it likewise shrinks on drying. There fore, gypsum gauging must be blended into the lime in proper proportion to provide initial set and strength, and to avoid shrinkage cracks. IVORY*--A double hydrated (over 92%) special finish ing lime that will not expand measurably in the wall. Requires no soaking to produce a smooth, uniform, white, highly plastic putty. May be mixed by adding dry lime to water in mechanical mixer because it develops its normal plasticity almost immediately then adding gaug ing. This is the preferred lime. Meets ASTM Designation C206-49 Type S and Federal Specification SS-L-351, Type F, including the added requirement of not more than 8% unhydrated oxides. RED TOP and GRAND PRIZE*--Shipped from Genoa, Ohio, are normal dolomitic hydrated finishing limes, and are only partially hydrated. They comply with Federal Specification SS-L-351, Type F, and ASTM Designation C6-46, Type N, but do not comply with specifications limiting the unhydrated oxides to 8 per cent. RED TOP Hydrated Limes shipped from Farnams, Massa chusetts and New Braunfels, Texas, are high calcium limes and are completely hydrated. They comply with ASTM C206-49 Type S and Federal Specification SS-L-351, and meet specifications limiting the unhy drated oxides to not more than 8 per cent. All types of USG* hydrated lime except "IVORY" Finish Hydrate require overnight soaking. They yield a smooth, highly plastic putty of exceptional purity. Until the advent of pressure hydrates, such as "IVORY," they were the standards of excellence. RED TOP and CHESHIRE Brands--Are high calcium finishing quicklimes. When properly slaked and aged for Page 10 at least 16 hours, hydration is complete, (over 92%) thereby insuring against further hydration and attend ant possibilities of expansion on the wall. Comply with ASTM Designation C5-26, and Federal Specification SS-Q-351. They have unusually high plasticity and purity. GAUGING PLASTERS 1. CHAMPION* and STAR* are WHITE Gauging Plas ters, for blending with lime putty to provide initial set and strength. They are ground to the proper fineness to blend readily and completely, thus minimizing the danger of check-cracking, crazing, etc. when properly used. They give strength and hardness to the surface finish. CHAMPION has a quicker "set" than STAR Gauging Plaster. They are the preferred gauging plasters because of the extreme whiteness of the finish when used with limes of high purity. Complies with ASTM Designation C28-50 "Calcined gypsum for finishing coat" and Federal Specification SS-P-402, Type G. 2. RED TOP GAUGING is a "local" gauging plaster, so called because it is made from a rock grade that is used in basecoat plasters. It is available with slow or fast "set." It is distinguished from White Gauging Plasters by its darker color. Except for color, RED TOP Gauging Plas ters are the equal of CHAMPION and STAR Gauging Plasters. Complies with ASTM Designation C28-50 "Calcined gypsum for finishing coat" and Federal Specification SS-P-402, Type G. PROPORTIONING--See Specifications LIMITATIONS OF USE 1. For interior application only. 2. Recommended proportioning must be observed. Fail ure to use sufficient gauging plaster, to blend thoroughly, or to trowel adequately often results in check-cracking, crazing, lack of hardness and bond failure. 3. Designed for normal humidity conditions. Where ex cessive humidity or frequent exposure to moisture is expected, use keenc's cement as later described. 4. Designed for normal usage. If hardness, and resistance to abrasion is required, use keene's cement as later described. 5. Must be applied to gypsum or lime plaster basecoat. Lime-gauging bond to portland cement plasters is in adequate. Do not apply direct to masonry. * Trademarks Reg, U. S. Pat. Off. BB021 244: FINISHING PLASTERS LIME PUTTY -- GAUGING (WHITECOAT) FI N IS H -- Continued SPECIFICATIONS Include the following in plaster specifications given on pages 4 to 7. MATERIALS Lime for finish plaster shall be (select one): (IVORY Double Hydrated Finishing Lime) (RED TOP or CHESHIRE Finish Quicklime) (RED TOP or GRAND PRIZE Finish Hydrate Lime) manufactured by United States Gypsum Company. Gauging Plaster shall be (select one): (CHAMPION or STAR "White" Gauging Plaster) (RED TOP "Local" Gauging Plaster) manufactured by United States Gypsum Company. MIXING AND APPLICATION OF FINISH PLASTER Lime shall be thoroughly soaked (or slaked and aged) according to manufacturer's directions printed on con tainers. (NOTE: IVORY Finish Hydrate requires no soaking or slaking.) Mix in the proportions of 3 parts lime putty to 1 part of gauging plaster, by volume. The equivalent by weight shall be 2 parts dry lime to 1 part dry gauging plaster. Thoroughly blend the gauging into the lime putty. When thoroughly mixed, it shall be ap plied to a partially dry basecoat. Scratch in thoroughly and immediately double back to fill out to a true even surface. Thickness to be 14" to Vs". Trowel at least once before final set, and water trowel during set to provide dense surface for decoration. Brush with clean water only. KEENE'S-LIME FINISH DESCRIPTION RED TOP keene's cement is a high strength, white gyp sum plaster. Kcene's-lime finish is composed of lime putty blended with keene's cement in proportions re quired to obtain desired hardness. Complies with ASTM Designation C61-40 and Fed eral Specification SS-C-161, Type 1 (Regular) and Type II (Quick Troweling). LIMITATIONS OF USE 1. Keene's cement is for interior finishes only. 2. Keene's cement finish is not recommended where ex posure to water is extreme or continuous. Use portland cement-lime plaster. 3. For application over gypsum basecoats of high com pressive strength only. FUNCTION AND UTILITY In addition to those listed for lime putty-gauging, it pro vides: Resistance to Abrasion. Keene's cement has exception ally high strength and surface hardness. See Technical Data on page 40. Low Water Absorption. Keene's cement, having a high density, has low water absorption. Choice of Hardness. Keene's cement is mixed with lime puttv in varying proportions for "hard" and "medium hard" finishes. See Technical Data and specifications. Two Types. Regular and Quick Troweling. Regular kccne's sets slowly, requires more troweling and may be used with any proportion of lime. Quick Troweling kccne's sets faster, requires less troweling and must be used with a minimum of 25 lbs. of dry hydrated lime [ter 100 lbs. of kccne's cement. SPECIFICATIONS The following should be included in plaster specifica tions given on pages 4 to 7. MATERIALS Keene's cement shall be RED TOP (Regular) (Quick Troweling) keene's cement manufactured by United States Gypsum Company. Lime--(Refer to Lime Gauging Specifications, above, and select one). MIXING AND APPLICATION This specification should be exactly as given for limegauging, except that keene's cement should be substi tuted for Gauging Plaster and the proportioning should be changed to one of the following: Page 11 BB021 2444 FINISHING PLASTERS KEENE'S --LIME FINISH --MIXING AND APPLICATION CONTINUED 1. "Medium Hard" Finish shall be mixed in the propor tion of 50 lbs. of dry hydrated lime to 100 lbs. of Keene's Cement. This proportion is approximately 100 lbs. of lime putty to 100 lbs. of keene's cement, or 35 qts. of lime putty to 100 lbs. of keene's cement. 2. "Hard" Finish shall be mixed in the proportion of 25 lbs. of dry hydrated lime to 100 lbs. of keene's cement. This proportion is approximately 50 lbs. of lime putty to 100 lbs. of keene's cement, or 17 qts. of lime putty to 100 lbs. of keene's cement. 3. Keene's Lime-Sand Float Finish shall be mixed in the proportion of 50 lbs. of dry hydrated lime, 100 lbs. of keene's cement and 400 lbs. of sand. This proportion is approximately 100 lbs. of lime putty, 100 lbs. of keene's cement and 400 lbs. of sand, or 35 qts. of lime putty, 100 lbs. of keene's cement and 4 to 5 cu. ft. of sand (26 No. 2 shovels of sand). PREPARED GYPSUM FINISHES RED TOP GYPSUM TROWEL FINISH and RED TOP GYPSUM SAND FLOAT FINISH DESCRIPTION RED TOP Trowel and Sand Float finishes are mill-pre pared gvpsum finish coat plasters requiring the addition of water only. There are no ASTM or Federal Specifications cover ing this type of plaster. FUNCTION AND UTILITY Red Top Gypsum Trowel Finish--is used where hard, smooth surfaces are desired. RED TOP GYPSUM SAND FLOAT FINISH--is used where a quality float finish is desired. Strength--approximately twice the strength of ordinary lime-gauging finishes. Early Decoration--may be painted as soon as set and dry. Factory Prepared--mill selection of ingredients and formulation insure uniform results and avoid variations possible with job mixing. Non-Alkaline--contain nothing injurious to paint or decorations. Bond--provides durable and natural bond to gypsum basecoat. Cost--slightly higher than job-prepared finishes. LIMITATIONS 1. Designed for application over gypsum basecoats only. .2 Should not be used on exterior surfaces where exposed to the elements or on interiors exposed to excessive moisture. Page 12 PLASTERING SPECIFICATIONS The following should be included in Plastering Specifi cations: Finish Coat shall be (RED TOP Gypsum Trowel Finish) or (RED TOP Gypsum Sand Float Finish) manufactured by United States Gypsum Company. MIXING AND APPLICATION Finish Coat--Prepared gypsum finish shall be mixed with water only in strict accordance with the manufac turer's directions. Include whichever of the following paragraphs is ap plicable: RED TOP Gypsum Trowel Finish shall be applied in 2 coats to a total thickness of not more than Vi" over a set, half-green gypsum basecoat. Scratch in a thin coat and double back with a second coat, filling out to a true and even surface. Trowel to a smooth finish free of cat faces and other blemishes. Use water sparingly during trowel ing. RED TOP Gypsum Sand Float Finish shall be applied in 2 coats to a total thickness of not more than V%" over a set, half-green gypsum basecoat. If the basecoat has dried out, it shall be sprayed with water, but not soaked, before the finish coat is applied. Scratch in a thin coat and double back with a second coat, filling out to a true and even surface. Float with a suitable tool to give a surface free from slick spots, cat faces and other blemishes. Use water sparingly u'hile floating. BB021 2A4E FINISHING PLASTERS RED TOP COVER COAT FINISHING PLASTER DESCRIPTION RED TOP Cover Coat is a mill prepared white gypsum bonding-finishing plaster requiring the addition of water only. FUNCTION AND UTILITY RED TOP Cover Coat is a specially prepared finishing plaster designed to furnish an adhesive bond for appli cation direct to smooth unpainted concrete (to which application of Bondcrete is not suited) and provide a finish surface ready for decoration. Application specifications provide for one coat work, which is most economical and provides customary finish appearance; and two coat work, which provides a supe rior finish appearance. If sand coat finish is desired, it must be two coat work. LIMITATIONS 1. For interior application only. 2. Not recommended for application on exterior ma sonry walls. 3. Not designed for use on surfaces which are exposed to excessive humidity or where frequent exposure to water is expected. 4. Unprotected steel in surface of concrete may result in rust spots on Cover Coat, requiring subsequent decoration. 5. As a finishing plaster it is designed for application in a total thickness not to exceed an average of y% of an inch. SPECIFICATIONS The following shall be included in the plastering specifications. MATERIALS Finish plaster over (smooth concrete ceiling, columns or beams) (specify) shall be RED TOP Cover Coat as manufactured by United States Gypsum Company. MIXING Mix RED TOP Cover Coat with warm water only (except for final coat where sand float finish is desired, the addition of 1 'A parts silica sand to one part Cover Coat by weight is permissible). All surfaces to receive Cover Coat shall be properly prepared as specified elsewhere. APPLICATION (Choose one of following methods:) a. Cover Coat shall be applied in one coat over a properly pre pared and dry concrete surface by scratching in a thin coat com pletely covering the concrete; doubling back with a thin coat and levelling out the surface with light trowelling. When it has taken up, trowel with water to a smooth level surface. Total thickness not to exceed an average of A". b. Cover Coat shall be applied in two coats over a properly pre pared surface. The first coat shall be applied to a dry surface in sufficient thickness to cover and embed the surface imperfections, and trowel level to receive the second coat. Over set dry first coat apply the second coat as thin as possible and after it takes up trowel with water to a smooth finish (if sand float finish, float to smooth even texture). Total thickness shall not exceed an average of A". SURFACE PREPARATION Over unpainted concrete remove all laitance and efflorescence by dry brushing and scrub surface with naphtha or mineral spirits to remove grease and form oil. Then brush or spray surface with 5% solution of zinc suiphate or alum in water to "neutralize" surface alkalinity and allow to dry. Patch holes and surface defects with paste of Cover Coat. ORIENTAL* INTERIOR COLORED FINISHES DESCRIPTION ORIENTAL Interior Finish is a mill-prepared and colored finish plaster requiring the addition of water only. There are no ASTM or Federal Specifications cover ing this type of plaster. FUNCTION AND UTILITY Integrally Colored at factory, requiring no decoration. Permits early occupancy. Avoids variations of color in tensity that are possible when colors are mixed at site. Colors (with LIGHT REFLECTION for float finish). White--81%; Sahara Cream--74.6%; Ivory--77.5%; Tusk Ivory--72.7%; Harvest Buff--66.6%; Parchment --74.2%; Golden Buff--70.1%; Mist Gray--63.9%; Cacnstone--51.4%; Shell Pink--64.8%; Desert Rose-- 56.2%; and Cool Green--67.4%. Texture--A finely floated surface or a textured finish-- in 12 colors. Strength--highly resistant to abrasion due to very great hardness. LIMITATIONS OF USE 1. ORIENTAL Interior is for producing finely floated surfaces or textures. Do not use for a smooth finish. 2. To be used on interiors only. *Trademark Reg. U. S. Pat. OJJ. SPECIFICATIONS The following should be included in plaster specifications given on pages 3 to 6. MATERIALS Finish Coat shall be ORIENTAL Interior Finish, manu factured by United States Gypsum Company. Color shall be as selected by the architect from schedule of colors furnished by manufacturer. MIXING AND APPLICATION Finish Coat--ORIENTAL Interior Finish shall be mixed with water only in accordance with the manufacturer's directions. ORIENTAL Interior Colored Finish shall be applied over a set and half-green gypsum basecoat. (Select one of following) : Float Finish--Scratch in a thin coat and double-back with a second coat, filling out to a true and even surface. Surface shall be floated with a cork float to give a surface free of slick spots, cat faces and other blemishes. Do not use water while floating. Texture Finishes--Textures shall be applied in such a manner that they will match the sample approved by the architect or his representative. Page 13 BB021 2446 FINISHING PLASTERS ACOUSTICAL PLASTER FINISHES (Brief descriptions are given here. Full data is given in AIA FILE 39-B) SABINITE* ACOUSTICAL PLASTER DESCRIPTION SABINITE is a highly efficient acoustical plaster, which provides a trowel or float finish of exceptional sound absorbent qualities. It is manufactured in four standard colors and white and requires the addition of water only. Basically mineral, it is incombustible. RED TOP ACOUSTICAL PLASTER DESCRIPTION RED TOP Acoustical Plaster is a highly efficient acousti cal plaster which provides a stipple, or stipple perforated finish. Having a harder surface than SABINITE trowel finish, it is more suitable for side walls which require sound conditioning. It is manufactured in oyster white onlv and requires the addition of water onlv. SABINITE 38 DESCRIPTION SABINITE 38 is an hydraulic acoustical plaster pre pared for use in locations subjected to high moisture conditions over a portland cement-lime basecoat. (See page 15.) It is manufactured in white only, and pro vides a float finish. SABINITE 38 is effective for sound conditioning in shower rooms, for ceilings in swimming pools, etc. LIMITATIONS (All Types) 1. Designed for use on ceilings and areas not exposed to rough usage. 2. To insure best results. Acoustical Plasters must be applied in strict accordance with manufacturer's directions. 3. Not recommended over radiant heated panel areas, due to lower thermal conductivities. EXTERIOR STUCCO FINISH ORIENTAL* EXTERIOR (COLORED) FINISHES DESCRIPTION ORIENTAL Exterior Finish is a factory-prepared stucco for exterior application over a portland cement-lime basecoat. It requires the addition of water only on the job. Colors: Pewter Gray, Eggshell Ivory, Sun Tan, Stone Gray, Copper Rose, Alamo Buff, Mission Green, Cascade Green, Pueblo Tan, Indian Coral, Rancho Brown and White. PLASTERING SPECIFICATIONS GENERAL PROVISIONS When exterior stucco is applied during cold weather, longer curing periods are necessary. In freezing weather, do not apply ORIENTAL Exterior Stucco unless special precautions are taken to keep the materials at a temperature above 50F. dur ing mixing and for at least 48 hours after application. FUNCTION AND UTILITY Factory Prepared--Uniformity in formulation insures endur ance under all weather conditions. Avoids possibility of job mixing errors. Integral Coloring--Prevents variations possible where colors are added at site. Decoration -- Requires none. Adaptable to any texture. SCOPE Unless otherwise shown on drawings, all exterior walls shall be finished as herein described. MATERIALS Exterior finish coat shall be ORIENTAL Exterior colored finish as manufactured by the United States Gypsum Com pany. Color and texture to be designated and approved by the architect or his representative. LIMITATIONS 1. Xol designed for use as a smooth trowel finish. 2. Requires a portland cement-lime basecoat. * Tnulrwm l:s Res;. C. S. I'at. Ojl. Page 14 MIXING AND APPLICATION OR IEXTAL Exterior colored finish shall be mixed and applied in strict accordance with the manufacturer's directions. BB021 2447 EXTERIOR STUCCO BASECOAT DESCRIPTION Exterior stucco basecoat is prepared on the job from portland cement, lime, sand and water and is the basecoat that receives the ORIENTAL* Exterior (colored) Finish. FUNCTION AND UTILITY Exterior stucco basecoat 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. Fire Resistant--Made from portland cement, lime and sand, it will not support combustion. Weather Resistant--Suitable for normal exposure to climatic variations. Strong--Properly mixed and cured, it provides a dense, hard base that will withstand normal wear and usage. 9 9 Economical--Use of standard, readily available materials pro vides a low cost basecoat. LIMITATIONS OF USE 1. Because of the use of portland cement, each coat requires curing with water after set. 9 2. Must not be applied in freezing weather or over bases con taining frost. 9 9 3. Must not be used on smooth, dense surfaces or over old, un sound stucco unless stucco mesh reinforcement is first properly applied. SPECIFICATIONS 9 9 9 (Note to Architect: The following specifications may be adapted to your requirements for interior portland cementlime plaster. Provisions for relief of setting and drying shrinkage should be made at locations such as ceiling-wall intersections, beams, columns or fixtures passing through the plaster. Joints should be provided to avoid excessive continuous areas.) ' SCOPE 9 Unless otherwise specified or shown on the drawings, all ex terior walls shall have a portland cement-lime stucco basecoat. 9 9 9 MATERIALS Reinforcing Mesh (w'here required) shall be USG STUCCO MESH applied with stucco furring nails or USG 3.4 lb. Self Furring Diamond Mesh Metal Lath, applied with If>" 11 gauge galvanized roofing nails. Nails to be spaced not over 6" on center vertically and 16" on center horizontally. Portland Cement--Shall comply with A.S.T.M. Designation Cl 50-47. Lime--Shall be MORTASEAL or RED TOP Masons Hydrate Lime or Quicklime as manufactured by the United States Gypsum Company. Sand--Shall be clean and sharp and shall meet the require ments of American Standards Association specifications A-12-2. Water--Shall be clean, free from harmful quantities of organic matter and fit for domestic consumption. Finish--Shall be ORIENTAL Exterior (colored) Finish as manufactured by the United States Gypsum Company. MIXING OF BASECOATS The scratch (first coat) shall be mixed in the proportion of one bag of portland cement (one cubic foot); two bags of MORTA SEAL (or two cubic feet of RED TOP Masons Lime Puttv) 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 brow'n coat (second coat) shall be mixed in the proportion of one bag of portland cement, two bags of MORTASEAL (or two cubic feet of RED TOP Masons Lime Putty) and nine cubic feet of sand (approximately 55 No. 2 shovels). APPLICATION Scratch coat shall be applied in a full J-g" coat, with sufficient pressure to form a good bond with masonry surfaces or to force it through and completely embed the metal reinforcement. 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 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. CURING 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 frequency of spraying required will de pend on the weather exposure, more frequent applications being required during hot, dry and windy weather. Page 15 9 BB021 2448