Document 4vjD1JDKZ9yXmpVznna8bGNxj

PLAINTIFF'S EXHIBIT Fireproof Gypsum 195? h' && W J -F Building Products Products ol Best wall Gypsum Company FIRESTOP BESTWALL* 3" For Fire-rated gypsum wallboard construction in single layer application over combustible and in combustible framing. 2 BESTWALL HUMMER SYSTEMS Laminated Bestwall1' gypsum wallboard construc tions for thin, non-bearing partitions and quality work. 4 n BESTWALL 2" SOLID PARTITIONS Non-bearing partition ofBestwall1" gypsum lath and plaster to save space and costs in new con struction and remodeling. 6 BESTWALL OLSEN GYPSUM LATH CLIPS For fast, efficient attachment ofgypsum lath. 7 BESTWALL JOINT SYSTEM For smoother, better drywall construction. 8 BESTWALL FIREPROOF GYPSUM SHEATHING 8 Fireproof - Wind Resistant - Water Repellent - Glass Fibered. SGP 0003888 tBTWALL Firestop Bestwall Gypsum Wallfaoard was the first drywall material to provide: Up to one hour fire resistant, load-bearing walls and ceilings with one layer application on both combustible and incombustible framing. Tw^-hour fire resistant, load-bearing walls with two layer application. This outstanding performance results from Bestwall's development of a gypsum board core with greatly improved fire resistive characteristics. Fire Ratings Proved (See Table Opposite Page) Constructions surfaced with Firestop Bestwall have been officially tested by two nationally-known laboratories under ASTM Std. E-119, following the standard time-temperature curve. Fire resistance ratings based on these tests are shown in the table on opposite page. Fire Hazard Classification proven by test. Easily Identified Firestop Bestwall is made under Underwriters' label Service. Underwriters' representatives con duct frequent inspection of Firestop Bestwall at each Bestwall plant where it is manufactured, as a check on Bestwall's manufacturing, inspection and quality-control operations. It is easy to identify Firestop Bestwall for each and every panel is branded on both front and back with the thickness of the board and the words "Firestop Bestwall." The Underwriters' manifest shown below ap pears on the twin mounting tape which binds the two cut ends in a bundle of two pieces (normal shipping package). This is for ft" Firestop. Meets Building Code Requirements Firestop Bestwall may be used to meet building code requirements for fire-resistant interior wall and ceiling construction in buildings of all types from highly incombustible to wood frame, and various occupancies as dwellings, single and multiple, institutional and commercial. Firestop may also be used as the interior finish of exterior load bearing walls to provide one-hour fire resist ance. Firestop Bestwall meets F.H.A. and V.A. requirements and has been accepted under most municipal, state and county codes and the national model codes. FIRE HAZARD CLASSIFICATION Flame Spread Fuel Contributed Smoke Develoaad 10-15 5-15 0.45 Improved Gypsum Core Aids Fire Resistance Firestop Bestwall's extra fire protection lies in its core. An exclusive Bestwall process minimizes shrinking and cracking of the gypsum core thus delaying the breaking up of the board when it is exposed to intense heat. Small amounts of glass fibers and unexpanded vermiculite are added to the gypsum core of Fire stop Bestwall. The incombustible glass fibers retain their strength under extreme heat, and so help hold the gypsum core together even after all the chemically-combined water has been released. The unexpanded vermiculite -- added in an exact amount and well dispersed in the core --expands under heat, just balancing the shrinkage of the gypsum core as it loses its chemically-combined water. Thus a solid face of calcinated gypsum stcys in place. This thermo-stabilized gypsum core increases Firestop Bestwall's insulation value at high temp eratures and provides up to three times greater fire resistance than conventional gypsum wallboard. Sound Transmission Rating Results of sound transmission tests by Riverbank laboratories on a standard wood stud partition faced each side with a single layer of ss" Fires::;: Bestwall Gypsum Wallboard, are shown in ire table below. This Firestop Bestwall construction compares favorably with similar constructions as reported in National Bureau of Standards Report BMS 17. 4* 2" x 4" Wood Stud Partition 16" o.c. Surfaced on Both Sides with . . . Single lay of ft" Firestop Bestwall %"gypsum lath with Vi" sanded plaster fV'gypsum lath with Vi" gypsum vermi culite plaster Metal lath with sanded plaster W Fiberboard (no plaster) Ave. Noise Reduction Value 39.0 34.9 32.6 39.2 32.2 Density; Perjl Sq. Ft*ify 7.2 lbs. 15.0 lbs. 9.6 lbs. 20.0 lbs. 3.8 ibs. 4. FIRE RETARDANT CLASSIFICATION j " *or : "u s_ . 11,;;q . -sn;n No . ,n 1 ! ` J i ills .: it - i |n, N. f" ii'it'oni s f.'-n-in l:l ,, No No -, *> ') ' SGP 0003889 Fire Resistance Ratings RATINGS 30 Minutes 45 Minutes 60 Minutes (1 Hour) 120 Minutes (2 Hours) 60 Minutes (1 Hour) 60 Minutes (1 Hour) 180 Minutes (3 Hours) PARTITIONS--Load Bearing or Non-Load Bearing WOOD FRAME 2" x 4" Wood Studs, 16" on centers. Both Sides of Partition Covered with 1 layer 54" thick 1 layer Vi" thick 1 layer thick or 2 layers 54" thick FLOOR AND CEILING CONSTRUCTION WOOD FRAME 2" x 10" Wood Joist Covered with Wooc Sub-Flooring, Building Paper, and Wood Finish Flooring, Ceiling Surfaced with 1 layer 54" thick 1 layer Vi" thick 1 layer 54" thick 2 layers 54" thick* STEEL FRAME Steel Studs--24" (Max.) on centers. Both Sides of Partition Covered with STEEL FRAME 12" Steel Bar Joists 24" on Centers. Covered with 2" Concrete Floor Slab. Ceiling Surfaced, through Metal Furring will 1 layer 54" thick* Non-Load Bearing Gypsum Strips for Studs Both Sides of Partition Covered with 1 layer 54" thick 1 layer 54" thick * Independent Laboratory Tests (Name on Request) 2 layers 54" thick 'load Bearing Test by Independent Laboratory (Name on Request). **Stran-S?eel Studs used In lest. Note: One layer of thick regular gypsum wailboard on ceiling only gives 25 minutes resistance. Nails for 5 7" thick boards -- 5d cc. 13Vi ga. flat head IV* long, 6'* on centers in ceiling, 7" on center in walls. Nails for H" thick boards -- 6d e_.c. 13 ga. flat head 1^" long, 6" on centers in ceiling, 7" on center in wails. Nails for second foyer in two layer applications of H" thick board-- 3d c.c. IPs ga. flat head 2H" tong, 7'* on centers in walls. These nailing specifications apply also to nailable steel framing with a nailing line or groove. 'Non toad Bearing Steel Framing -- I layer 3%" Firestop Bestwall, Underwriters' Tests July 1955 -- UL Design No. 8 -- 1 hr. Six Other Advantages In addition to its great fire resistance, Firestop Bestwall is: 1. STRONG -- It readily resists crosswise stresses. *4" Firestop Bestwall has a flexural strength of 225 o 275 lbs. as compared to Federal Specifications minimum requirement of 105 lbs. for Vi" regular gypsum wailboard. 2. LONG LASTING--Firestop Bestwall resists cracks due to framing movements, vibration and settling. It's unaffected by extremes in temperature nd relative humidity. 3- VERSATILE -- It is adaptable to any plan. Can be arched or curved. 4. EASILY DECORATED - Properly primed and e<^' Firestop Bestwall will take any type of ecoration -- enamel, oil paint, resin emulsion pcnnt, water paint, wallpaper, etc. 5. QUICKLY APPLIED - Large, easy to handle panels cover up to 48 square feet of wall surface. 6. ECONOMICAL -- Firestop Bestwall goes up fast, cuts by scoring and snapping, is easily nailed. SIZES, THICKNESSES, WEIGHTS Thickness Width Length Edge Wt sq. ft. 54" 48" 6' to 12' Tapered 2.6 lbs. IV' 48" 6' to 12' Tapered 2.1 lbs. SGP 0003890 r LAMINATED GYPSUM Patented and Patents Pending Space-Saving Non-Bearing Partitions to Reduce Building Time and Costs Bestwall Hummer Systems are especially de signed methods for erecting Bestwall Gypsum Wallboard in multiple layer applications. They may be used with conventional framing or without framing in nonload bearing partitions to provide low-cost, high-quality wall and ceiling surfaces. Laminated gypsum wallboard constructions pro vide sturdier, stronger walls and consequently less maintenance cost, greater resistance to sound and heat transmission, and better Fire protection. Most interior framing can be eliminated when laminated gypsum board constructions are combined wi-h trussed roof construction in residential work, and with flat slab or beam and girder construction in commercial and industrial buildings. Thin wall sections -- in the range of from 2" .to 2'i" thick -- make it possible to use many standard thin wall-opening details. Modern, thin, narrow, plain trim fits in with these thin laminated gypsum wallboard partitions. Bestwall Hummer System A SYSTEM A 3-rjr'nq or Non Beormq !\ * /! i . Va. , -'* J This is the oldest and simplest laminated wallboard construction. Application is over conven tional framed walls and ceilings. The first layer is nailed (spot nailed only) and the second layer is ap plied with adhesive and nailed. (Illustrated above.) Bestwall Hummer System A Modified wide Bestwall Gypsum Wallboard are laminated, narrow strips being used between outer layers to reduce bulk, weight, cost, and to provide space for wiring, and to reduce sound transmission. The improved construction combines one sheet of ^a" Bestwall Gypsum Wallboard faminated on each side of three strips of two thicknesses of '2" board which serve much as gypsum studs. This panel has proved excellent for interior nonlocd bearing partitions. The two-layer laminated application of System A is the accepted way to finish framed ceilings and framed exterior walls, in buildings with solid masonry walls, a refinement of the non-load bearing partition (System B Modified) makes a simple, self furring, free-standing wall surfacing. Essentially this variation in construction detail omits the full sheet on one side of the panel. I SYSTEM A MODIFIED System A Modified is an improved method of applying gypsum wallboard to frame constructions in two layers. It is a sure way of putting up gyp sum wallboard to minimize nail poping and joint beading and provides a perfect installation. Bestwall Hummer System A Modified assures you of top quality laminated gypsum wallboard construction. Bestwall Hummer System B Modified System B Modified was developed to provide walls without frame or support of any material other than gypsum wallboard. Sheets of 4' SYSTEM B MODIFIED Bestwall's 5a" Firestop Bestwall consistently shows a flexural strength in the direction parallel the folded paper edges of the board of 250 lbs. (plus) against a Federal Specification (SS-W-51a; requirement of 105 lbs. for ,-j" regular gypsum wallboard. Systems A and B Modified Require Joint Treatment Systems A and B Modified are designed to have the joints treated with a paper tape and cement and to present a clean, unbroken surface. SGP 0003891 This factory-fabricated narrow panel of several layers of gypsum board is ideal for walls where joints are left unfinished and for movable wall con struction. Special lapped edges give a good-looking paneled effect. The panel can be used in homes, apartments, offices and factories. It can be erected in the morn ing, trimmed and painted in the afternoon since there are no nails in the surface and no joints to be treated. SYSTEM C System C is recommended where omission of joint treatment is desired. Basic units are fabricated at Bes'wall's gypsum plants, which results in a minimum amount of labor in the field. The factory-made panels are 8' long and are made of two full sheets of 3s" Bestwall Gypsum Wallboard and two strips. The edges are so ar ranged as to effect a tongue and groove product. The face paper is that of regular gypsum wallboard and may be readily decorated. Two combinations are available. In one, the full sheets are 16" wide and the edges are rounded. The second panel is made with sheets 24" wide and the edges are beveled. The second panel being a little wider is a little less expensive to erect. However, with the exposed joints 2' on centers, the paneled effect will be different in appearance. Although both panels can be handled easily, the 16" wide unit is the lighter. Workman sets pro-hung door and frame with trim (on one side) in Bestwall Hummer System C partition. Neither panel is recommended for use if the joints are to be treated. In addition to the extra cost of finishing the greater number of joints, the finished wall will not be as true as can be accom plished with 4' wide sheets. System C can be erected very rapidly with a minimum amount of field work. Besides saving the cost of the joint treatment this system uses blind nail and screw attachment to make possible one coat paint decorations with good results. The panel is designed for use in a movable partition but will be equally satisfactory in a per manent partition. Thus, it finds its place in re modeling work as well as new construction. The panels of System C can also be used to erect a less than ceiling high partition for fast, low-cost dividing walls in large office or loft buildings. Bestwall Hummer System B Modified and C Ideal for Homes Built with Trussed Roof Construction Bestwall Hummer System B Modified provides an ideal nonload bearing gypsum wallboard parti tion in the popular trussed roof construction -- used to help reduce house costs in one story and so-called story-and-a-half houses. Illustrations (left) show typical small home with roof framed in conven tional manner with center load bearing partition carrying the ceiling joists, and with walls finished with \i" gypsum board. The same home is shown in which trussed roof design is used and interior partitions are the thin gypsum wallboard construc tion of Bestwall Hummer System B Modified. Notice possible space savings. There are corresponding cost savings. SGP 0003892  I. -COHC. SLAB - ctiLina runnu CUP 2" Solid Partition Gypsum Lath and Plaster For Lightweight, Fire-Resistant, Non-Bearing Walls in New Construction or Remodeling GYPSUM LATH CORE/ Z' SOLID PARTITION 1 w IT*r. CLIP -W OL*Tt* , 4VPJUM OAMCL -MtTAL BASE. -ri*. I SUCTION Bestwall 2" Solid Plaster Partition of incom bustible Bestwall Gypsum Lath and Bestwall Gypsum Plaster provides quick, inexpensive non load-bearing walls in either new construction or remodeling. It reduces labor costs because of the speed with which it can be erected. Lath goes J fast, especially with Bestwall Olsen Gypsum Lorh Clips for attaching lath panels to each other, to ceiling, runners and to horizontal and vertical bracing. ADVANTAGES 1 Hour Fire Rating Economical Light Weight Solid Durable Tested under A.S.T.M. standards. Eliminates studs and double lath. Clips speed work. Save lime, labor and materials. 2" solid plaster partition weighs from U to 19 lbs. per sq. ft. 4" plastered tile partition weighs from 26 to 30 lbs. per sq. ft. No hollow space for vermin, rodents, dirt. Solid wall is sturdy, rigid, permanent. SGP 0003893 Olsen Gypsum lath Clips ECONOMICAL Save time and labor. Therefore, job casts ore lower. EFFICIENT lath is permanently and securely attoched to any type of framing. FAST Less nailing, no wire-tying, and easy attachment enable the lath to be erected faster. VERSATILE Lath is easily dipped to bar joists, (Beams, wood studs and joists, steel studs, steel channels, and Z>Bars. Single clips perform many functions. DURABLE Clips are made of 12 gauge elec tro-galvanized wire (or heavier). REDUCES CRACKING Resilient clips reduce cracks caused by movement of framing. CONTROL SOUND Improve resistance to sound trans. mission by resilient attachment of loth to studs. No solid attach ment to transmit sound through the wall. TYPE I R.OAUNG CORNHI CUP Holds gypsum lath panels at right angles to each other; i.e., at wall comers and at ceiling perimeter. Type B-l far lath; 8-2 far W lath. TYPE C KStUEMT AND CONNECTOR CUP For attaching gypsum lath panels to wood studs and joists, various steel studs, bar joists, and Junior I-Beams. Also used as a bridge dip to connect lath panels in many explications. In National Bureau of Standards test with the Type C Clip attaching gypsum lath to wood studs, a plastered partition had a Sound Transmission lass of 44_5 decibels average from 128 to 4096 cycles per second. TYPE D TURN CUP Secures long-length gypsum lath to the ceiling runner of soGd plastered positions. Other uses: attaching gypsum lath to steel studs, channels or Z-Bars of hollow wall partitions or furred watts. Simplifies the insertion of the last lath panel of a peti tion or ceiling since the dip can be turned on an adjoining panel, to avoid interference, and then be turned back to engage the last panel being installed- It eliminates blind tying. Can also be used as a bridge dip to connect lath panels. TYPE F$ STARTER CUP is used to attach the first lath panel at the ceiling edge. TYPE F CHANNEL CLIP To attach gypsum lath panels to J4" furring channels or pencilrod type bar joists for application of plaster or acoustical tile. Eliminates cross furring with 3*". channels when used with this type of joists. Type F-l is for V' lath; F-2 for '2" lath. TYPE G FURRING CLIP Used to support 3V' furring channels as a temporary horizontal bracing of gypsum lath for solid plastered partitions. Also to secure long-length gypsum lath to horizontal furring channels of furred walls. It eliminates blind tying. TYPE H CORNER AND CEILING RUNNER CLIP Used to secure long.length gypisum lath to each other at corners in plastered studless partitions. Also to attach tho mid-point of long-length lath to ceiling runners, when prong-type runners are not used. HAIRPIN TYPE CHANNEL CLIP Used in suspended ceiling construction to suspend furring channels from I'j" cold rolled carrying channels. One clip suspends -V' hot roiled furring channels; the other suspends 34*' cold rolled channels. TYPE l-B I-BEAM CUPS Used in suspended ceiling construction to connect or 1" furring channels to I-Beam. The clips are made of 6 gauge wire for plastered ceilings and 8 gauge for acoustical ceilings. TYPE JX Used to attach H" gypsum lath to light gauge metal studs. TYPE J STEEL STUD AND FURRING CHANNEL CLIP For attaching gypsum lath to all of the following: 34", 1" I'j" hot or cold rolled furring channels, and metal studs with a flange '2" broad. It caft be used in most any suspended ceiling construction and in metal-stud wall construction. TYPE S Used to anchor bottom edge of the bottom sheet of gypsum lath ta the bottom plate in metal stud, hollow partitions. TYPE K RESILIENT STARTER CUP Used in resilient wall and ceiling construction to hold the loth panels at the top, bottom, ends and corners of the wall, artd around the perimeter of the ceiling. TYPE Z CENTER CUP For suspended ceiling construction. Attaches gypsum lath to furring channels through the center of the panel. Prevents the lath from sagging. Also used a* a starter clip around the ceiling perimeter. Provides the necessary attachment far light traffers, eliminating wire tying. SGP 0003894 K B TYF TYPf TYPE TYPE TYPE BESTWALL JOINT SYSTEM PRODUCTS FIREPROOF GYPSUM SHEATHING BESTWALL JOINT SYSTEM Two different gypsum woilboard joint treatments are available. A one-material treatment, Bestwall Joint System Ce ment, does for both em bedding and topping tape and for spotting nail heads. The Cement has the adhe sive qualities needed to hold embedded tape and the work ability needed for topping. Color of cement, when dry, matches the face paper of Bestwall Gypsum Wailboard. A good topping out job with Bestwall Joint System Cement eliminates sanding. A two-material treatment provides Bestwall Bedding Com pound for bedding tape, and Bestwall Topping Compound for covering tape, finishing the joint and covering nail heads. Topping Compound is soft enough when dry to be sanded, so is preferred by applicators who wish to sand fheir joint work. PACKAGING: Bestwall Joint System Cement. No. 1 Package 18 lbs. Cement; 250 ft. Tape. No. 2 Package 4 lbs. Cement; 60 ft. Tape. (6 to carton) No. 3 Package 4 lbs. Cement; 60 ft. Tape; 1 Plastic Broad- knife. to Carton). Cement only -- 5 lbs. ;6 to carton) -- 25 lb. bags. Bestwall Bedding Compound -- 25 lb. bags. Bestwail Topping Compound -- 25 lb. bags. Bestwall Certex Texture --- 25 lb. bags. 3estwall Tape -- 250 ft. and 500 ft. rolls. (5000 ft. to carton). BESTWAIL FIREPROOF GYPSUM SHEATHING Bestwall Fireproof Gypsum Sheathing is reinforced with textile glass filaments for easier, quicker application, cleaner creaks, and greater flexibility Insist on Bestwail Fireproof Gypsum Sheathing. Bestwoil's precision-made 2' x 8' panels, applied hori zontally across framing members, he 7 studs together. Pre cision-cut tongue-and-groove edges fit together to help make a permanent, rigid surface, structurally strong and di mensionally stable. FIREPROOF WIND RESISTANT WATER REPELLENT REINFORCED WITH GLASS FIBERS STRUCTURAL STRENGTH DIMENSIONAL STABILITY During the devastating Kansas flood i"> 1951, only the roof of 'his house was visible for days. When the rag. ing waters receded the gypsum jheafhmg was found to be undam aged. The water-repellent core re turned to its original hardness with out any worpagfi, shrinkage c' bucki..ig Note 'hat most of the mingles, secured by double-headed nails with double shanks that expand in the gypsum core were held fast against the fury of the flood Those which were torn away were easily 'olaced.) Bestwall Gypsum Sheathing is extra water-repellent because the moisture has to get through the tough, treated covering paper before .f can attack 'he treated core. This extra measure of water repellence provides a solu tion to the old, nagging problem of outside on-the-job storage BESTWALL Manufactured by GYPSUM Sold Through COMPANY f ATLANTA, GA. BUFFALO. N. Y. CHICAGO, ILL. CHICAGO HEIGHTS, ILL. Form No. 5657 Rev. 9-57 General Office*: Ardmore, Pennsylvania * DISTRICT OFFICES CLEVELAND, OHIO DALLAS, TEXAS DES MOINES, IOWA DETROIT, MICH. EAST ST. LOUIS, ILL. JACKSON, MISS. KANSAS CITY, MO. MINNEAPOLIS, MINN. RICHMOND, CALIF. 5ALT LAKE CITY. UTAH TACOMA, WASH. WILMINGTON, DEL. SGP 0003895 specifications for gypsum plastering Ccont'd) section 4 E. Metal Grounds and other accessories, such as corner beads, screeds, picture molds, etc., shall be carefully ex amined to see that they are straight, curved, plumb, level, square, or true to the acquired angles, as the case may require, before the plaster is applied. 10. APPLICATION OF BASE COAT A. Two-Coat Work.--Base (first) coat shall be applied with sufficient material and pressure to form good bond on gypsum lath or masonry as the case may be, and to cover well. Then, before this scratch coat has set, and without raking its surface, material of the same propor tions shall be doubled back to bring the plaster out to grounds struck to a true surface with rod and darby, and left rough, ready to receive the finish (second) coat. Slowsetting plaster shall be accelerated to provide a set (mixed material) of less than 4 hrs. B. Three-Coat Work.--Scratch (first) coat shall be ap plied 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 fiber insulation lath or masonry, as the case may be, and to cover well and then be scratched to a rough surface. Slow-setting plaster shall be accelerated to provide a set (mixed material) of less than 4 hrs. Brown (second) coat shall be applied after the scratch (first) coat has set firm and hard, brought out to grounds, straightened to a true surface with rod and darby, and left rough, ready to receive the finish (third) coat (Note 2). Note 2--To insure full plaster thickness, plaster screeds should be applied to the scratch coat prior to the applicauon of the brown coat. C. Plastering on Monolithic Concrete.--Surfaces of walls and columns shall have a scratch coat of bond plas ter, 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, or 100 lb. of gypsum neat plaster to not more than 3 cu. ft. of vermiculite or perlite) troweled into the scratch coat before it has set. The brown coat shall be brought out to grounds, using a double-back application if required, straightened to a true surface with rod and darbv. and left rough, ready to receive the finish coat. Surfaces of ceilings shall have a coat of bond plaster, scratched in thoroughly, doubled bark, and filled out to a true, even surface and left rough, to receive the finish coat. D. Studlcss Solid Partitions (Gypsum Lath and Plaster. Single-thickness Lath) shall be plastered in accord ance with the specifications in the Bestwall Solid Plaster Partition booklet. 11. APPLICATION OF FINISHES The finish coat shall be applied to a partially dry base coat or to a thoroughly dry base coat which has been evenly wetted by brushing or spraying. The use of exces sive water shall be avoided in the application of all types of finish coat plastering. A. Trowel Finishes: Gypsum-Lime Putty Trowel Finish: Shall be applied over the base coat scratched in thor oughly, laid on well, doubled back and filled out to a true, even surface. The general thickness shall be Vie to Zs in. The finish shall be allowed to draw a few minutes and then it shall be well-troweled with water to a smooth finish, free from cat faces and other blemishes or irregu larities. Vermiculite Trowel Finish: Shall be applied over the base coat, scratched in thor oughly, laid on well, doubled back and filled out to a true, even surface. The general thickness shall be yis to Zs in. The finish shall be allowed to draw a few minutes and then it shall be well-troweled with water to a smooth finish, free from cat faces and other blemishes or irregu larities. Prepared Gypsum Trowel Finish: Shall be applied to a general thickness of Vt6 to Zs in. It shall be well-troweled with a minimum of water to a smooth finish, free from cat faces and other blemishes or irregularities. B. Keene's Cement-Lime Putty Finish: Shall be applied oyer the base coat, scratched in thor oughly, laid on well, and doubled back and filled out to a true, even surface. The general thickness shall be from Vi 6 to Zs in- unless the finish coat is to be marked off or jointed, in which case the thickness may be increased as required by the depth of the marking or joint. The finish coat shall be allowed to draw a few minutes and then it shall be well-troweled with water to a smooth finish, free from cat faces and other blemishes or irregularities. Trowel ing shall be continued until the finish sets. C. Float Finishes: The following float finishes shall be applied over the base coat, scratched in thoroughly, laid on with a trowel to an even surface, and then floated (with wood, carpet, cork, rubber or other type floats, depending on the texture desired) to a true, even surface free from slick spots or other blemishes: Prepared Gypsum--Sand-Float Finish. Gypsum--Sand-Float Finish, Keene's Cement-Lime Putty--Sand-Float Finish. D. Acoustical Plaster and Other Special Plasters: Shall be applied in accordance with the directions of the Manufacturer. 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PENNSYLVANIA BW-58250--3M-R-1 -59-H SGP 0003900 PRINTED IN U.S.A.