Document 2NV1do788wLGNx4j3V71rv917

t-ti-HJL. L. SHEETROCK THE FIREPROOF WALLBOARD Into this book has gone helpful informa tion for carpenters. As a convenient time book it helps you keep track of your own hours or wages, or the hours and wages of a whole crew. It furnishes a great deal of other infor mation that is valuable to carpenters, in cluding calendars front and back, a table of wall and ceiling measurements, a wallboard footage table, and a lumber table. Into Sheetrock, The Fireproof Wallboard, have gone the quality and im provements that for two decades have made it one of the country's leading wall and ceiling coverings. The test of 20 years' time, actual use of billions of square feet of Sheetrock* under all sorts of conditions in all parts of the country, extensive research, and the long experience of the United States Gypsum Company--all these things have made Sheetrock a perfected product. Sheetrock is popular because it fur nishes carpenters with a completely de pendable wall and ceiling covering. As proof of its popularity, it has been esti mated that during the 20-year period over a thousand carpenters have always been busy on Sheetrock jobs. The reason for this popularity is prob ably better known to the carpenter than Registered Trade-murk. 24 to anyone else. He knows that when he has used Sheetrock the owner will be , satisfied with the job. The owner has been given increased fire-protection. He gets this added fireprotection because Sheetrock does not burn. It is made of fireproof gypsum, moulded while in a plastic condition be tween two sheets oftough, protective paper. It can be of great value in protecting wood framework from attack by fire. The job is sturdy. The rigidity of Sheet rock has added greatly to the bracing strength of the walls and ceilings. Its bracing strength is much greater than that of the average wall finish. The wallboard is' tough. It does not buckle nor does it warp either with mois ture or temperature changes. The owner has been given a wallboard that is durable--it will last as long as the building lasts. Not only is the owner given a superior job; the carpenter, himself, will get a great deal of satisfaction from using Sheetrock. Because it is well packaged, Sheetrock edges are protected from mill to job, it will be clean when it arrives on the job, and it will stack neatly. When the carpenter applies Sheetrock he will find it easy to handle. It is light in weight yet has great strength. 25 SHEETROCK SPECIFICATIONS GENERAL Framing Lumber. Use surfaced and well-dried lum ber. (Green or wet lumber will shrink, warp, and twist after wall is in place.) Framing. Space studs, joists, or furring strips 16" O.C. All framing members must be in alignment before board is applied. Plates must be flush with studs. Window and Door Frames. Have mill cut frames for Sheelrock grounds. If standard frames are on job, cut down pulley stile or use filler strip. Ceiling Heights. If possible plan ceiling height that will take standard lengths when applied verti cally, or standard widths when applied horizon tally. This will avoid waste and save joints. If height of ceiling is a few inches over standard height or width of Sheetrock, this may be taken up under baseboard or picture mould. Room Sizes and Openings. Wherever possible plan openings and room sizes to use standard lengths and widths of Sheetrock. This reduces waste and joints. Corner Framing. Provide nailing members for both boards forming interior or exterior corners and ceiling-wall angles. Headers. Except in horizontal construction provide headers to support all edges of Sheetrock. Over Old Plastered Walls. Cross furr ceilings. If plaster surface is fairly solid apply directly to old framing members, nailing through plaster. Quar ter inch Sheetrock will ordinarily avoid burying trim. 26 BB022 1243 APPLICATION OF SHEETROCK Cutting or Scoring. Score face with sharp knife, snap back breaking core and cut paper on back side. When necessary to saw place face side up and support close to sawing edge. On any cut edge or mill end use rasp or coarse sandpaper to smooth edge and bevel paper on face side of board. Nails. It is important that proper nails be used. For Vi" and %" Sheetrock use 4d Cement Coated 14 Gauge l3/e" long-head not over Vi". For Vi" Sheetrock use 5d Cement Coated 13Vi Gauge ls/e" long-head not over Vi". Over old plas ter use 6d Cement Coated l7/s" long, head not over Vi." DO NOT USE BRIGHT GALVANIZED OR BLUED NAILS. Nailing Sheetrock. Space 4" to 5" at joints (don't stagger nails). Space 6" to 8" in the field. Drive nails'home, leave hammer mark in board, head of nail must be below level of board to spot with cement. Be sure board is firmly seated against framing member. DON'T USE NAIL SET OR BREAK THROUGH SURFACE PAPER. Butt folded edges without forcing, but leave cut edges or mill ends Vi" apart. (If face paper is properly beveled, cut edges or mill ends may be butted and still leave required spacing between the two face papers.) Apply ceilings first--for one man application on ceilings use a T made of lx2's to support one end of Sheetrock and nail a cleat on studs about s/s" below ceiling to support other end of Sheetrock. Do not let joint on opposite sides of a partition fall on same stud. Break end or cross joints. NEVER LET FOUR CORNERS COME TOGETHER. 27 HORIZONTAL CONSTRUCTION Our specifications permit only %" and V2" Re cessed edge Sheetrock with Perf-A-Tape to be ap plied horizontally. Do not use Vt" Sheetrock or any square edge Sheetrock for horizontal application. The only rec ommended joint treatment to be used on recessed edge Sheetrock for horizontal construction is PerfA-Tape or Metal-A. Apply at right angles to studs, joists, or furring strips. Header is not required back of recessed edge. If fire stop or brace is required place above or below recessed edge joint. End joints will fall on framing members. Apply ceilings first. Apply from ceiling down on side wall. Wherever possible avoid end joints in ceilings by spanning with one standard size board either with or across joists. On walls span room if possible with one stand ard size board. Bring end joints in walls to offsets or above and below openings. (Pieces cut from openings may be used in closets.) APPLICATION OF PERF-A-TAPE General. 1. If spacing between boards exceeds Va". use Sheetrock Finisher to fill before applying PerfA-Tape. 2. Sufficient cement is in package to apply PerfA-Tape. DO NOT ADD ANYTHING TO CEMENT. ,3. Spot all nailheads in the field with joint cement to surface of the board. 4. Do not mix more cement than will be used in one day, and protect mix from drying by cov ering with wet cloth. 5. Perf-A-Tape may be omitted at wall and ceiling angles if crown or picture mould is used. 28 Mixing Cement. BB022 1244 1. Mix with water to a stiff putty consistency that will hold to Sheetrock knife without dropping. CEMENT MIXED TOO THIN WEAKENS BOND. 2. Allow to stand twenty to thirty minutes to com pletely take up water. 3. If cement works thinner after standing add suf ficient cement to bring to stiffer consistency. Sheetrock Knife. 1. This knife has a blade that is carefully hollow ground to permit its use both for pressing ce ment out as a putty knife, and for smoothing cement. 2. Use knife at right angle to joint surface when setting tape and pressing excess cement out from under tape. 3. In finishing or to make a smooth surface, use knife at about a 45 angle to joint surface, press ing down on blade. The hollow grind in knife under pressure permits about an inch of blade to drag on joint surface and leaves cement smooth. PERF-A-TAPE APPLICATION ON RECESSED EDGE 1. With Sheetrock knife butter cement into chan nel of recess. Be sure channel is completely and evenly filled. 2. Place Perf-A-Tape in recess, centering middle row of holes exactly over joint. Force Perf-ATape down into recess and remove excess ce ment by pressure on the knife. Run knife over channel, leaving film of cement over the tape, filling the channel flush with surface of board. 3. Cut tape to fit entire length of joint, but work only a few feet of tape at a time to avoid slip page and wrinkling of tape. 29 4. Let this application dry thoroughly, after which high spots should be removed with medium sandpaper. 5. Apply finishing coat of cement to fill in low spots and take up slight first-coat shrinkage. 6. Remove droppings from surface of board be fore dry--this eliminates unnecessary sanding. 7. Smooth finished joints and nail heads with No. 2 sandpaper. PERF-A-TAPE APPLICATION ON MILL END OR CUT JOINTS 1. Tape must have sufficient cement under it to provide proper bond. 2. Application is same as recessed edge joint ex cept that cement must be feathered out several inches beyond edges of tape. APPLICATION OF CORNERS 1. Fold tape along center row of holes, forming a right angle. 2. Apply in same manner as flat joint. 3. Be sure sufficient cement has been applied to thoroughly embed the tape. 4. Apply finish coat on interior corners one side at a time, permitting this side to dry before ap plying other side. 5. On exterior corner build finishing coat to true angles. When dry, sand to remove rough edges. SIZING ON SHEETROCK AND PERF-A-TAPE 1. For Texolite--Use USG K-Cemo Primer. 2. For Wallpaper and Calcimine--Use Varnish size only. (This permits the removal of Wallpaper or Calcimine at later date.) 3. For Egg Shell Stipple--Use Textone for Stipple (no sizing required). 30 BB022 1245 4. For Prepared or Lead and Oil Paint. A. For best results our recommendation is USG K-Cemo Primer. B. When Pigmented Varnish, Varnish or Pre pared Size is used, we recommend it con tain a filler or aggregate which will avoid the appearance of slick, glossy spot over ce mented surfaces. DO NOT USE GLUE SIZE. JOINT TREATMENT FOR SHEETROCK Sheetrock joints are filled with special cement. Patented tape is embedded in the cement. 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