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UNITED STATES GYPSUM The Greatest Name in Building General Offices: 300 West Adams St., Chicago 6, III. 1958 - ^9 \ ~ i TABLE'OF CONTENTS BASECOAT PLASTERS wtmm THREE COAT PLASTER In three coat work, the first (scratch) coat is raked to provide tooth for the second (brown) coat. Id two coat work on gypsum lath and masonry the basecoat may be applied by scratching m 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) in 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 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. P0* Plaster Aggregates............................................................................................... 3 RED TOP* Gypsum Cement Plaster.................................................................. 4 RED TOP Wood Fiber Plaster............................................................................ 4 RED TOP STRUCTO-LITE* Gypsum Plaster..................................................... 5 BONDCRETE* Plaster........................................................................................... 5 Portland Cement.Lime Plaster Basecoat......................................................... 6 Exterior Stucco Basecoat..................................................................................... 6 Fire Test Data......................................................................................................... 6 Technical Data........................................................................................................ 6 B. FINISHING COATS Finish coat plaster provides the base for final decoration. It is applied to a thickness of from !4 in. to % 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. Technical Data FINISHING LIMES pog. IVORY* . Double hydrate................................................................................. 0 RED TOP & GRAND PRIZE* Hydrate (Dolomitic)......................................... 8 RED TOP & CHESHIRE* Quicklime (High Calcium}...................................... B GAUGING PLASTERS CHAMPION* . quick set................................................................................... STAR* . slow set.................................................................................................. RED TOP Gouging slow or quick set........................................................... STRUCTO-GAUGE*.............................................................................................. Keene's Cement . regular or quick troweling.............................................. 8 8 8 8 6 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 SABINITE*................................................................................................................ 9 HI-LITE*.................................................................................................................... 9 AUDICOTE*............................................................................................................ 9 C. ORNAMENTAL PLASTERS Moulding Plasters.................................................................................................. 9 Casting Plasters................................................................................... 9 poffe D. SPECIFICATIONS................................................ 10-12 *TJA. Reg. U.S. Pat. Off. CS016 1187 PLASTERS BASECOAT PLASTERS GYPSUM PLASTER DESCRIPTION The base of all gypsum plasters is gypsum rock, or hydrous calcium sulfate, which has a water content of about 20 per cent in chemical combination. During manufacture % of this water 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. The character and proportions of these additives vary according to the type of intended use and the climatic conditions of the area in which the plaster will be used. U. S. Gypsum basecoat plasters can be used on gypsum and metal lath; gypsum, clay, or concrete tile; concrete or cinder blocks; monolithic concrete; brick, or other approved plaster bases. When the proper plaster for the plaster base is applied correctly, it will bond firmly to the base to provide a sound foundation for the finish coat. FUNCTION AND UTILITY 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 principal problems to be considered are outlined below. Fir* Protection Gypsum base plasters, properly proportioned with approved aggregates, provide excellent fire protection. (See page 6 for technical data on fire ratings.) For maximum fire resistance in ceiling construction, use RED TOP gypsum plaster with lightweight aggregate over lathing base, strongth (See page 6.) Strength varies with the type and quan tity of aggregate used, the thickness of the basecoat, and the integrity of the plaster base over which the basecoat plaster is applied. 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. Abut* For surfaces which must endure abuse (school corridors, etc.), wood fiber plaster, or RED TOP gypsum plaster with sand aggregate, will provide the best results. PLASTER AGGREGATES Sand Sand is the most commonly used plaster aggregate. It is rela tively inexpensive and readily available in most locations. Three important factors must be considered when sand is used: 1. Sand must comply with the requirements of ASTM Designa tion C35 for graduation. 2. Sand must be clean. Foreign matter weakens the plaster, reduces its hardness, and may lengthen or quicken the setting time. 3. Sand must be correctly proportioned with gypsum cement plaster as shown in the table below. Proper proportioning is readily accomplished by use of a standard shovel size. A No. 2 shovel, for example, holds approximately 15 pounds of damp, loose sand. For 1:2 mix, 13 shovelfuls of sand would be required with each 100-pound bag of plaster, 20 shovels for a 1:3 mix. Vermiculite and Perlite The use of lightweight plaster aggregates, vermiculite and per lite, is steadily increasing as their advantages become better known. They are more easily loaded, unloaded,- transported, and stored. For cold-weather plastering, they have the advan tage that they can be stored indoors ready for use at seasons when wet sand stored outside will freeze. Plaster made with these aggregates and ready for application weighs approximately half as much as sanded plaster and offers greater fire resistance. Plaster made with perlite or vermiculite provides excellent fireproofing for steel beams or columns when used over metal or gypsum lath. The saving in weight is as much as 200 lbs per foot of length compared to concrete fireproofing. Because perlite and vermiculite have greater insulation and a much lower ex pansion than sand, the plaster stands up much longer when exposed to fire. Vermiculite and perlite are mixed with gypsum plaster on the basis of volume of aggregate to weight of plaster. See the table below for proper proportions. Lightweight aggregates should not be used in conjunction with radiant heating systems. Vermiculite and perlite must conform to ASTM Specification C35. . USE OF AGGREGATES WITH GYPSUM CEMENT PLASTER--Maximum Recommended Proportions Plastering Base Gypsum Me,Lt.aa.tl,.h Unit Masonry: G~ypsum JT-i.le Clav Tile r`c*t Cement Block Number of Coats j Three coats: Scratch coat 1 Brown coat , Two coats | Basecoat 1 ThcS,,recerat.ccoh, atsc:oat. J Brown coat I Thr_ee coa. ts: SQ cratch coo. t j Br0wn CO' Two coats: Basecoat Pioiter to Sand By Weight 1:2 1:3 1:2'A 1:2 1:3 1:3 1:3 1:3 j j | j ] i i ! Vermiculite, Perlite Weight of Plaster to Cubic Feet of Aggregate 100:2 100:3 1 00:2 Zz 100:2 100:3 100:3 100:3 100:3 'T.M. Reg. U.S. Pat. Off. UNITED STATES GYPSUM 3 CS016 1188 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 two formulations: Reg ular, for use with sand aggregate, and LW for use with lightweight aggregates. RED TOP 6 Y P 8 U M6 CEMENT PLASTER . vnITII ITAtM T.M 114. U i 4T 0*. 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. Ordinarily it requires no maintenance. 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 C28-55, gypsum wood-fibered plaster, and Federal Specifica tion 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 infproper proportioning of plaster and aggregate. Over masonry, be cause of excessive suction, one part of sand must 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. i ft f 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. .2 Under no conditions should RED TOP Gypsum Plasters be applied directly to concrete. Use BONDCRETE Plaster, described on page 5. 3. Gypsum Plasters should not be used where contact with excessive water or moisture is expected. In such instances, use portland cement-lime plaster. .4 Gypsum Plaster is an interior basecoat plaster and should not be used on exterior surfaces exposed to wetting. ^ o 5. Plaster application on masonry walls and concrete that have been coated with bituminous compounds is not recommended. .6 Because of the possibility of condensation or water seepage, plastering directly to the interior side of solid exterior masonry walls is not recommended. Such ^ walls should be furred before plastering. - CO 4 --1 4 *KM. tag. U& Pot Off. ' RED TOP STRUCTO-LITE7PLASTER 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. This plaster complies with ASTM Designation C28 for gypsum readymixed plaster. The perlite used in it complies with ASTM Designation C35 for inorganic aggregate for use in interior plaster. The proper proportioning of gyp sum cement plaster with a well graded, controlled-density perlite aggregate, and the establishment of a mill-controlled set, help to as sure uniform strength in the plaster slab. REDTOP ft sTRUcrointtir bypsum PLASTER *| & ! Because the perlite in STRUCTO-LITE conforms with exacting spe cifications for density, strength, and gradation, and is thoroughly 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. 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. 7. When used in conjunction with radiant heating sys tems, the temperature at the surface of the piaster shall not exceed 115 Fahrenheit. The thermal con ductivity of gypsum-sand plaster is approximately three times that of STRUCTO-LITE, and if STRUC TO-LITE is used over radiant heating panels, the heating system must be designed to allow for this in sulating value. .8 BONDCRETE should be used only on concrete that is properly prepared for plastering. It should be ^ applied only to concrete having sufficient roughness cl to provide proper bond. See 9. Maximum thickness of _ coat shall not exceed $* onceilingsor additional thickness is required, sbaflbe*1 secured to the concrete surfaces. __- r~- - -; f _--**i. 'Lrr,?i-^jc,** }-*"* 'v. 10. Basecoat piasters musthiR * -Tii_ -- frames or metal base, unless th lessen the vibration by grouting,!1 ^..... or both. Lath and plaster should recess mtft'or$&hmd the frame or base. ' t ' '' ` ' '-r *TM. Rg. U4. Pot. Off. "V T" *y- 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, 7}^ 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 highmoisture 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 he to pg 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. Types 1. Gypsum-gauged-lime, 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 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 troweling are essential to produce a smooth, glossy surface. 2. Keene's Lime: for a hard, smooth, white trowel finish. With TECHNICAL DATA-FINISH PLASTERS 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*, AUDICOTE*, and HI-LITE* types. See page 9. Dolomific Lime Hydration 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. Mix by weight of dry materials: Color GAUGING PLASTER TO LIME STRUCTO-GAUGE TO LIME 1:2 1:2 1:1 Medium Hard Hard White White White QUICK TKOW&ING KEENE'S TO LIME 2:1 Medium Hard White 4:1 Hard White Finish Texture Smooth Smooth Smooth Smooth Smooth Hardness in Kilograms (f) 34 56 108 50 70 Workability 1 1 247 Cost Factor Labor & Mat'l. 100 125 150 170 180 If) Kilograms required to force a 10mm ball .01' Into plaster face. (11 These are hard finishes but the aggregate in the surface does not permit an indication with this test. GYPSUM TROWR FINISH NEAT White Smooth 55 3- 125 GYPSUM FLOAT FINISH ORIENTAL FINISH NEAT NEAT White or Gray -7 Colors Hoot Float m it) 65 125 160 1" O to>n- o* o 1 5 *6 *TAb Reg. US. Pat. Off. '.j BASECOAT PLASTERS FINISHING PLASTERS l \I i\ FIRE TEST DATA (XJI twt. mod. at nationally racognlxad flr tasting laboratort.*) CONSTRUCTION TYPE BASE PANEL TYPE PLASTER AGGREGATE THICKNESS RATMO * Wood Frame Wood Frame Wood Frame Wood Frame Wood Frame Wood Frame Wood Frame Wood Frame Wood Frome 3' Holler. mO&A.tt* 4' Hollow PYROBAR Solid Solid Solid Solid Solid TRUSSTEEL* Stud TRUS5TEEL Stud TRUSSTEEL Stud TRUSSTEEL Stud TRUSSTEEL Stud H' ROCKLATH* Ploln H' ROCKLATH Plain H' Perf. ROCKLATH H' Perf. ROCKUTH Part. ROCKLATH Metal Lath Metai Lath Metal Lath Metal Loth Metal Loth Metal Loth Metal Lath ROCKUTH ROCKUTH Metal Lath Metal Lath Metal Lath Metal Lath W Perf. ROCKUTH BRACE-TTTE* Clips PARTITIONS Gypsum-Sond 1:2, 1t2 Gypsum Wood Fiber Gypsum-Sond 1 2, 1 >2 Gypsum-Perlite 100*2)6 Gypsum Vermiculite 100*2)6 Gypsum-Sond 1t2, 1 <3 Gypsum-Sand 1t2, 1i2 Gypsum Wood Fiber Gypsum-Vermicvlite 100*2)6* 100*3)6 Gypsum-Sond 1:3 Gypsum-Sand 1:3 Gypsum-Sand 1:2, 1:3 Gypsum-Sand 1:2, 1i2 Gypsum-Perlite 100:2, 100*3 Gypsum-Sand lil, 1:2 Gypsum-Perlite 100*2, 100:3 Gypsum-Sond 1i2, 1:3 Gypsum-Sand 1:2, 1t2 Gypsum Wood Fiber Gypsum-Perlite 100>2, 100:3 Gypsum-Sand 1:2 or STRUCTO-LfTE* yi' Vh# (jLW lit* K' S* A' Vi . V2M r2Vi' V A' y A' V w 45 Minutes 1 Hour 1 Hour 1 Hour 1 Hour *3 MkwtM 1 Hour m Mon - 1 Hour 3 Hours 4 Hours 45 MBwtus 1 Hour 2 Hours 1 Hour. -. Itt Heun 45 Minutes , 1 Hour ' 2 Hours 2 Hours _ 1 Hour Wood Frame Wood Frame Wood Frame Wood Frame Wood Frame Steel Jptsf (C) Steel Joist (C) Steel Joist (C) Steel Joist |C) Steel Joist (C) Steel Joist (C) Steel Joist (C| Cellular Steel Floor Cellulor Steel Floor Cellulor Steel Floor W Perf. ROCKUTH W Perf. ROCKUTH (A) %' Perf. ROCKUTH Metal Lath (B) Metal Lath W Perf. ROCKUTH BRACE-TITE Clips Channels 1 6' OX. Same, plus 1 4 Go diogonal wire connecting clips Some, except chonneb 12# O.C, Metol Lath Metal Lath Metal Lath Metal Lath Metal Loth ID) Mefal Lath (E) Metal Lath (D) CBUNGS Gypsum-Sond 1:2 Gypsum-Sand 1 2 Gypsum-Perlite 100:2)6 Gypsum-Sand 112, 1*3 Gypsum Wood Fiber Gypsum-Perirte 100:2)6 or STRUCTO-LITE . Gypsum-Perlite 100:2)6 Gypsum-Perlite 100:2V6 Gypsum-Sand 1:2, 1:3 Gypsum-Vermiculito 100:2, 100*3 Gypsum Wood Fiber Gypsum-Vermiculite 100:2, 100:3 Gypsum Wood Fiber Gypsum-Vermiculite !00<2, 100:3 Gypsum-Perlite 100:2, 100:3 VUi0f ( *6* C' AT H' K' , K' ; 1i r' *i 1* 45 Minutes 1 Hour 1 Hour 1 Hour 1 Hour 1 Hour 2 Hours . S Hours 2 Hour* . - 3 Hours 3 Hours 4 Hours 4 Hours 4 Hours 4 Hours Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Steel Section Metol Loth Metol Lath (F) Metol Lath (F) Metal Lath {F} PYROBAR*-2' Solid, or 3" Hollow W Perf. ROCKUTH H' Perf. ROCKUTH Perf. ROCKUTH W Perf. ROCKUTH 2 loyen L. L. R. L. Plus 1' 20-ga. mesh 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 or STRUCTO-UTE Gypsum-Sond 1:3 Gypsum-Sond 1:2)6 Gypsum-Sand 1:2)6 Gypsum-Perlite 100:2)6 Gypsum-Perlite 100*2)6 Gypsum-Perlite 100:2, 100:3 }4' \r 1H' IK' Vi' Vi' H' 1' IK' 1 Vi' 4 Hours 4 Hours 4 Hours (A) Loth applied with 1 13 gauge nails, %' hood and joints covered with Striplath. 1 %* noils. (B) Loth appliod with 1 '/j', 11 gauge, hood barbod roofing nails, 6s O.C. (C) 2V6* reinforced concroto slob on Ribloth or 2" procast gypsum tile above. (D) Ceiling 9* or more below Boor slab. (E) Coiling 3' or more below floor slab. (F) Self-furring metal loth wrapped tight to column or diomond mesh on chonnol frame not Ailed solid to column. . * i :-M A TECHNICAL DATA--AVERAGE TEST RESULTS (NOTt-r*,ulh ,wm ltParcrt* below these overage figures) Flotbr MU Strength Compressive (|i dry) Tensile STRUCTO-UTE (Regular) WOOD FIBER cement PLASTERSand Vermiculite Perlite Neat 1:1 1*2 1.3 (100.2 100*3 /100,2 1100*3 900 2100 1900 1200. 750 500 300 1000 650 150 400 245 170 120 130 90 165 105 Avarag. t.st r.sults. Figur.s may vary slightly for products from individual mills. may wy iomwii-obm r Weight (Ib/cu ft dry) 52 BO 105 113 113 52 45 50 44 t CoedsdWBy "K* 1.4 4.32 to 5.55 4.24 to 3J7 171 to 1.S4 1,44 to 1.63 M2 to MS 1.23 to 1.35 . *T. M. Reg. U. S. Pot. Off. UNITED STATES* GYPSUM 7 j *[ - n - Cfl ri ! z t 0- - | i *0 nj | LIME AND GAUGING (WhiteCoat) LIME AND KEENE'S 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. 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, usually over a gypsum basecoat. Ease of appli cation, flexibility, whiteness, and economy make this by far the most widely used plaster finish coat. 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). RED TOP Gauging 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). 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. KEENE'S CEMENT RED TOP Keene's cement is a high strength, white gypsum plaster. Keene's lime finish is composed of lime putty blended with keene's cement in proportions required to obtain desired hardness. Complies with ASTM Designation C61-40 and Federal Specificstion 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. J) i * I j | \ > [ [ [ f * 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. Gypsum gauged--lime finishes are designed for nor mal usage. Where greater hardness and resistance to ' `S&.X&'-i-:,. . . : abrasion are required use_____ ,________ _ _ sum Trowel Finish, or Keene-a^oMafflSfc^C' 4. STRUCTO-GAUGE Gypsum Trowel Finish, and Keene's cement must be apphed^wrer^baaecoats oif high compressive strength ry.i ^; o 5. Acoustical plasters are di and areas not exposed to 6. Acoustical plasters are no^nwuimaennea over nun- ant heated panel areas due te loiv'thennal ecnduo- tivities. .. - >o u " 7. ORIENTAL Exterior colored finisBmosf-fce ap-.f plied to a Portland cement--Kme-basecoat only. . mSim *J-?**?* " "" " -r. 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 con r 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%; Old Ivory, 77%; Desert Rose, 56%; Azure, 58%; Sahara Gold, 63%. Use on interiors only for a finely floated surface or special textured finish. Do not use for a smooth finish. Very great hardness pro tects 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 used. 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 SABINITE; more suitable for side walls above ^ wainscots which require sound conditioning. White ' -- only. Over 75% light reflection. Requires addition of 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, port land 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). *TJA. Rag. U.S. Pot. Off. UNITED STAVES GYPSUM ,, 9I0S 3 Notts to Architect Select one or more of the following basecoat plasters, aggregates and finish coat plasters as desired or required to meet fire-resistant ratings. Where conductivity of the plaster is a factor, see limitations on Pages S, i, and JO. 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 approximately 2" top and bottom (or side pivoted windows approxi mately 4') to provide air circulation; and, in enclosed areas or buildings lacking openings for natural ventilation by the use of temporary circulators or the air conditioning system. 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. III. GROUNDS. The minimum thickness of plaster over 16''x48" gypsum lath shall be H"; over gypsum partition tile brick, clay tile or other masonry, it shall be thick; over metal lath, the plaster thickness shall be Ys" measured from the face of the lath; and over long length gypsum lath. Solid plaster partitions shall be (2"), (214*). (2/-2')> (3'). (A greater thickness in grounds may be required for certain fire ratings. See table, page 37, and specify accordingly.) IV. MATERIALS. Bos* Coat Platter shall be (Structo-Lite), (Red Top Cement Plas ter), (Red Top Wood Fiber Plaster), (Bondcretei as manufactured by the United States Gypsum Company. Aggregate (for cement plaster), (wood fiber over masonry), shall be (sand), (perlite), (vermiculite) meeting the requirements of ASTM Designation C35-54T--"Inor ganic Aggregate for use in Interior Plas tering." 10 Aggregate for job mixed sand float finish shall be a graded silica sand all passing a (30 mesh), (20 mesh) screen. Water shall be clean, fresh and suitable for domestic consumption. For (Exterior Stucco Base), (Portland Cement-Lime plaster) the Portland Comant shall comply with A.S.T.M. Designation Cl50-47, the Limo 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 Platter shall be: a. Gypsum gauged lime putty trowel fin ish made from Ivory Double Hydrated Lime and (Champion Gauging Plas ter), (Star Gauging Plaster), (Red Top-Gauging Plaster) as manufactured by the United States Gypsum Com pany. b. High strength gypsum gauged lime putty trowel finish made from Ivory Double Hydrated Lime and (StructoGauge) (Red Top Quick Troweling Keene's Cement) as manufactured by the United States Gypsum Company. c. Red Top Gypsum Trowel Finish as manufactured by the United States Gypsum Company. d. Re 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 and Cast enrichments made with Red Top Moulding Plaster and 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 BondCRETE 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. Using a stiff fiber brush, the Portland cement grout shall be forcibly dashed on the concrete surface with a whipping mo- tion. This coat shall be kept damp for at least two 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. b. United masonry surfaces that exhibit high suction shall be moderately wetted 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 reinforcing 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. VI. BASE COAT PROPORTIONS. a. Structo-Lite 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). Re 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 plas ter to three cubic feet of perlite), (100 pounds of plaster to three cubic feet of vermiculite). Red Top Cement Plaster, when mixed for two-coat work over gypsum lath, shall be mixed in the proportion of (one part of gypsum to not more than 2 parts of sand by weight), (100 pounds of gypsum to not more than 2 ]/2 cubic feet of perlite), (100 pounds of gypsunl to not more than 21/2 cubic feet of vermiculite). c. Red Top Wood Fiber Plaster. For ap plication over all types of lath, shall be mixed with water only. For masonry surfaces (except mono lithic concrete), the scratch and brown coats of wood fiber plaster shall have (one part of sand by weight), (one 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), (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 (or two cubic feet of lime 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, n cn c>- Ch >0 CJI y 4 , ' , ( 1 , ' I j j 1 ! : . : ' i ! I l ft j 't \ [<_ v* SPECIFICATIONS approximately two pounds of fiber or hair shall be added to each mix of the above proportions. The brown coat (second coat) shall be mixed in the proportion of one bag of Portland cement, two bags of Mortaseal (or two cubic feet of lime putty) and nine cubic feet of sand (approximately 55 No. 2 shovels). 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. VII. GROUT..Grout for door frames and b. All 2)4' flush metal base for solid lath metal base shall be (Structo-Lite), (Red and plaster partitions and furred exte Top Cement Plaster) and not more than rior walls shall be grouted. Provide a (200 pounds sand), (2 cubic feet of perlite) V-Groove to receive (Rocklath plas per bag of plaster. ter base) {% Riblath). (Grout after 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 channel studs are erected for channel stud metal lath partitions.) c. All metal base applied to masonry or stud partitions shall be grouted. ment shall be cleaned after mixing each batch. Do not mix more material than can be used in one hour. X. BASE COAT APPLICATION. a. For two-coat work over gypsum lath and masonry, the base (first) coat shall a. Structo-Lite shall be mixed with be applied with sufficient material and clean water only and hoed to uniform pressure to form a good bond on the application consistency. gypsum lath or masonry, as the case b. Red Top Cement Plaster and aggre gate shall be mixed dry to a uniform may be and to cover well, and then be doubled back to bring the plaster color at one end of the box, hoed into out to grounds, straightened to a true the water at the other end and thor surface with rod and darby, and left oughly mixed to proper consistency. rough, ready to receive the finish c. Red Top Wood Fiber Plaster shall be (second) coat. mixed with clean water only and hoed b. For three-coat work, the scratch (first) to uniform application consistency. coat shall be applied with sufficient (For application over masonry aggre- material and pressure to form good full r'l ' gate shall be added and dry mixed prior to adding water.) d. Bondcrete shall be mixed with clean water only and hoed to uniform ap plication consistency. 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, For mechanical mixing, the mixer shall be brought out to grounds and straight cleaned of all set or hardened material ened to a true surface with rod and before materials for a new batch are darby and left rough, ready to receive loaded. Each batch shall be mixed sepa the finish (third) coat. rately. Material that has partially set shall not be retempered or used. Mix no more material than can be used in one hour. c. For (2)4') solid gypsum lath and plas ter partitions, apply a scratch coat of plaster with a maximum 3-hour set, about Vs" thick, to each side of the a. For Structo-Lite plaster, no aggre lath. In no case, shall application of gate shall be added. Put the approxi scratch coat to second side of lath be mate amount of water in the mixer delayed longer than the setting time and add the Structo-Lite and mix to of the scratch coat applied to the first proper application consistency, adding side. Scratch lightly in horizontal di water if necessary, and dump the en rection only. tire batch and use. After the scratch coats have set firm b. Reu> Top Cement Plaster; put the ap ly and have partially dried (but not proximate amount of water required in less than 16 hours), the brown coat the mixer, then, while the mixer is in shall be applied to the unbraced side, continuous operation, add approxi bringing it out to within )4' of ground mately half the amount of aggregate dimension for finish coat. When brown required, add all of the plaster and add coat has set firmly (but not less than the remainder of the aggregate. Mix 3 hours), braces shall be carefully re to proper application consistency, add moved from opposite side and brown ing water if necessary, and dump the coat applied to that side in a manner entire batch. similar to that described for the other c. For Gypsum Wood Fiber Plaster; add brown coat. the approximate amount of w'ater re d. For (2 )4') solid studless metal lath and quired. Then add the plaster and mix plaster partitions apply scratch coat to proper application consistency. and allow it to set and partially dry. When sand is added for application Then apply brown coat to side opposite over masonry bases, add the water, braces, allowing it to set thoroughly then the sand, and then add the plas- before removing temporary braces. . ter and mix to proper application con- Next apply brown coat to previously ^j sistency. 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(2J') 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 applied to full grounds in not less than two operations and allow to set. Next apply 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 %' over the lath, darby level and leave rough ready for finish coat. g. 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. h. For column fireproofing total thickness o(Vf sp"l)a,s(tenr ,ov(1erVsla')t,h(f1aHce")s.hAapll pbley ()4"), a full scratch coat, cross rake and allow to set. Then apply brown coat to within )%' of thickness required and leave level and rough ready for application of finish coat. i. 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. j. 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. k. Scratch coat of (Exterior stucco) (Port land cement--Lime plaster) shall be applied in a full Vs' 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 Vs' 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 fre quency of spraying required will de pend on the weather exposure, more frequent applications being required during hot, dry and windy weather. XI. PREPARATION OF LIME PUTTY. IVORY Finishing Lime shall be mixed with clean water only, using approximately 5H to 6 UNITED STATEfOYFSUM.. CS016 1196 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 (400 pounds, or 34 gallons, of lime putty). 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 8% 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 dry lime (50 pounds, or 4J^ 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 8 Yi 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. ]'. 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 to be y%'. (Except Acous tical Plaster which shall be Yi thick.) a. Trowel finishes shall be water troweled during set to provide a smooth, dense surface for decoration, free of irregu larities 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. Sabintte 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 piaster. 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. "STRUCTOIITE," "RED TOP," "BONDCRETE," "PYROBAR," "ROCKLATH," "ORIENTAL," "SABINITE," "IVORY," "GRAND PRIZE," "MORTASEAL," "CHESHIRE," "CHAMPION," "STAR," "TRUSSTEEL" and "USG" are ngiiltrtd trade-marks; "HI-LITE," "AUDICOTE" and "STRUCTO-GAUGE" ar trade-marks owned by United Stale* Gypsum and are used by it to distinguish product*, at its manufacture. "5TRUCTO-LITE" identifies the particular prepared plaster manufactured only by United Slates Gypsum. "RED TOP" Identifies the particular plaster* and finishes manufactured only by United States Gypsum. "BONDCRETE" identifies the particular plaster far concrete surfaces manufactured only by United Slates Gypsum. "PYROBAR" identifies the particular gypsum partition tile manufactured only by United States Gypsum. "ROCKLATH" identifies the particular gypsum lath or plaster base manufactured only by United States Gypsum. "ORIENTAL" identifies the particular colored finishes manufactured only by United States Gypsum. % "SABINITE," "AUDICOTE" and "HI-UTE" identify the particular acoustical plasters manufactured only by the United States Gypsum Company. "IVORY" and "GRAND PFIZE" identify the particular hydrated lime manufactured only by the United Stales Gypsum Company. "CHESHIRE" identifies the particular high calcium finishing lime manu factured only by United Stales Gypsum. "MORTASEAL" identifies the particular masonry lime manufactured by United States Gypsum. "CHAMPION" and "STAR" identify the particular white gauging plas ters manufactured only by the United States Gypsum Company. "STRUCTO-GAUGE" identifies the particular prepared gauging plaster manufactured only by United States Gypsum. "TRUSSTEEL" identifies the particular truss designed stud manufactured only by the United States Gypsum Company. l UNITED STATES GYPSUM.. The Greatest Name In Building OINIRAl OPPIClii 300 WIIT ADAMS ST., CHICAOO , h Canodai CANADIAN GYPSUM CO, LTD, TORONTO--MONTREAL .-srsfMis.-..