Document ZnmOrVqm9p4p8D9jNL2XVzgaZ

JflllT SYSTEM PRODUCTS FOR GYPSUM WALLS OAR D p"-#:GI 1fcWKMr-jp^jj GEQROSA"PACSF f GYPSUM DIVISION Georgia-Pacific Joint Treatment Products conform to ASTM Specification No, C475-64 and Federal Specification No. SS-J-570, CAM 000982 m. OMni A - MA 11 Ic; SPECIALTY JOINT SYSTEM PRODUCTS :S3THX TEXTURING COMPOUND , BESTEX A ` rciirwniNC Bestex is a texture finish that produces hard, white surfaces that have excellent light reflective qualities and hiding power. Bestex A has no aggregate, B has a small amount of fine aggregate, C has a heavy amount of aggregate, and D has a coarse aggregate, creating a simulated acoustic effect. The B, C and D textures are for spray application only. Bestex A is available in 25 lb. bags, Bestex B, C and D are available in 40 lb. bags. Surface Preparation: Coverage:* Bestex,w A, B, C and D, All surfaces, including joint system applica tions, must be dry and clean. Roughen glossy surfaces. Prime any exposed metal surfaces with a rust inhibitor. Fill and seal any wood surfaces, For best results, it is recommended that a vinyl primer or equivalent be applied to the entire surface prior to texturing. Bestex A; 12 to 50 lbs per 1,000 square feet of gypsum wallboard depending upon texture pattern. Bestex B, C and D: Each 40 lb. bag finishes approximately 300 to 500 square feet of gypsum wallboard. Application; Bestex B, C and D. Apply with conventional spray texture apparatus as product warrants. Con tinuously agitate the mix when spraying to avoid separation or settling. For best coverage and uniformity of texture, spray a given area first in one direction, and then immediately double back at right angles to this application. Air pressure in spraying equipment will affect degree of tex ture. For coarser texture, use less air pressure, for finer texture, use more air pressure. 9 CAM 000988 G-P Bedding and Topping Compouna is a i!-bag system Bedding is used for the initial coal and Topping is the recommended material for all succeeding coats. G-P Triple Duty, Ready-Mix, All Purpose and Speed Set are 1-bag systems and may be used independently for all steps in the treatment of drywall joints, nails and screws and corner bead applications. It is preferable to use Topping Compound or Triple Duty for the final coat over Speed Set Joint Compound, 'SAILS AND SCREWS 1. Draw finishing knife across nail and screw heads to be sure they are all driven to proper level Apply first coat of embedding type compound (G-P Bedding, Triple Ouly, Ready-Mix. All Purpose or Speed Set) over (ho nail or screw head Apply ample pressure on knife to smooth compound lo surface level of the board Do not bow blade with excess pressure as this tends to scoop compound from the dimpled area 2- When dry, apply second coat (G-P Topping, Triple Duty. Ready-Mix, Joint Compound or Speed Set) with even knife pressure to ensure complete coverage. 3- When second coat Is dry, sand lightly and apply third coal. Depending on humidity, temperature etc , additional coats may bo requtrod Light sanding may bn necessary before applying decoration ' '--ED .OINTS 1. Apply G-P embedding type joint compound (G-P Bedding. Triple Duty, Ready-Mix. All Purpose or Speed Set) fully and evenly Into the valley formed by adjoining tapered edges of G-P Gypsum Wallboard When using machines, tape and compound are applied in one operation 2. Center G-P Wallboard Tape and press Into compound with a drywall knife held at approximately a 45' angle Draw knife along tape with sufficient pressure lo squeeze some compound from edges of tape, yet leaving enough for a sufficient bond. 3. Apply a fill coat extending a few Inches beyond edges of tape and leather edges of compound The purpose of this coat is to conceal the tape and (ill the portion of the valley not filled by the tape 4. When dry (24 hours or longer), apply a second coat and feather the edges about \ 'i beyond first coat, with a wide knife. Use G-P Topping, Triple Duty, Ready-Mix or All Purpose Speed Set may be covered as soon as compound sets. 5. When dry, sand lightly and touch up any imperfections Wipe off dust from sanding in prepara tion for the decoration 1 The end or butt joints are not tapered so care must be taken to leave sufficient joint compcima underneath the tape to ensure a good bond between the tape and the board 2. Apply a fill coat as described for tapered joints and feather compound 1 inch beyond ecge at tape When thoroughly dry the second coat is leathered 1 to 2 inches beyond edges ol sk>rr coat if necessary third coat feathered 2 inches beyond edges of second coat may be applied The tola application ol joint compound is approximately t 4 to 18 inches wide Alternately end toirt may :e finished with a coat on each side of the tape but covering each edge Another coat is subsear em , applied to cover the center of the tape 3 The object in finishing the end joint is to keep Ihe center build-up ol joint compouna :s ; possiDte since a high crown encourages ridging and shadowed areas CAM 000989 Problems Which Can Occur in Joint Treatment !!ij; -- --....... ...... . JofeH Treatment' r^g&P'- Cos^Hiam - - ^ ^ Cause J'f SWytt Warklng Cement *jyfi0kjfp'i3`-11'' ~ir" ' V- Insulticlent soaking time; that is. the casein may -r'i not be in solution so that optimum plasticity is not reached Sotttes In , Dirty or contaminated buckets Aggravated by ''5"^ --vyfe-.-Ps(3 - 4 ^5 humid weather conditions Same as (or Settling Condition aft* Stytnfcaes-."- -. ' v ....................... .: ^ Efes CrscWnfl %** ' ' w^r- :*". -c- . ; '< : Excessive arnounl ol mixing water Especially prev alent when cold water and cold cement are used Thick coals ol cement under the tape and last drying conditions. ' Nalls Photographing Tape Photographing Starved Joints Blisters in Tape Poor Bond i Cracks in Inside | i "Burn Thru" or Joints Showing Thru Paint "Bleeding Thru" "Showing Thru" Beading Airborne soo! or dust particles collecting over nailhead. Shank of nail will conduct coid; air borne particles collect over this cooler area. Cement over tape is glazed due to tape being high. Deeper lilts on either side of tape will not be glazed and will thus have a rougher texture. Delayed shrinkage (not allowing preceding coats to dry). Insufficient cement applied over tape to fill recess. Over sanding. Insufficient cement under the tape. Tape not ini tially pressed into good contact with cement. Freezing ot wet cement in pail or on wall alter application Insufficient soaking time. Too much cement over the tape at apex of angle 1. Painting before the joint system is completely dry. 2 Crowning the joints will cause a dillerence in light reflection. 3. Difference in texture and suc tion between cement and board 4. Painting with paint having poor hiding properties -- thinning - paint too much (Same is true lor textures, as well as paints.) Movement ol the board or uneven shrinkage Nall Popping 12 Shrinkage of lumber or loose board Remedy or Prevention Allow sufficient soaking time (at least 20 minutes) Use only clean mixing pails and tools. Avoid excessive standing ol mixed materials. Same as above. Use 60! F. water and follow man ufacturer's instructions Avoid application over hot sur faces near pipes, radialors. sala manders Control venu,ation dur ing the drying cycle In hot weather so as not to obtain radical changes in temperature, avoid drafts. Dependent upon cleanliness of air. Deposits can be washed ofl Press tapes in tightly. A shear coat will equalize suction and texture. Allow sufficient drying time be tween coats of cement. Keep sanding to a minimum. Open up blister by slitting tape Fill cut with cement and press tape back In place. Protect from freezing Allow nec essary soaking time. Wipe down corners correctly, leaving only a small amount or no cement In the apex. 1. Allow sufficient drying time 2. Avoid high crowns 3. Apply primer or skim coat 4. Avoid ex cessive thinning of paints. Bring adjacent boards into same plane witn a shear coat belcre taping Be sure board is tight to framing. Allow framing to dry as much as possible Draw board up light to framing without crushing core or cutting paper CAM 000991 Advantages of G-P Joint System Products TJ. " ---- :--- :--rIT--- "SW AxSr&ste&sz MMna# : r*vv:i *?. -m uJ.|jfef~:StabUttS*' '--v Description Competitive products must be mixed very still initially, whereas Georgia-Pacilic products are mixed at about the consistency they will be used Alter mixing our products stillen, whereas competitive products thin out This is particularly true in warm weather, -*v Our products have, in general, more plasticity than competitive products Plas ticity enables better control In applying our products, with both hand application and Ames tools This means better shearing and feathering qualities -..* if- , V .: AM '*gj Our products develop greater strength and water resistance over a period ol time Alter 30 days standing competitive products turn mushy when re-veiled, while our products retain their strength because of their resistance to dampness and wetting. Shrinkage <. . , Quality; Our products have, in general, lower shrinkage than similar competitor products J G-P Topping has lower shrinkage than any other casein based compound According to management, Georgia-Pacific Gypsum Division joint system sales have increased greatly while complaints have decreased. This is a strong rc:cation of high quality standards Common Causes of "Nail Pops." UN-EVEN TOP PLATE TWISTED STUD STUD NOT ALIGNED CAM 000992 BBOROIA-PAC I P I C JOINT SYSTEM PRODUCTS GENERAL SALES DATA LJ JOINT SYSTEM CRYING OME Temperature and humidity have a direct effect on the drying time of joint treatment products. While there is very little that can be done to alter temperature and humidity under job conditions, care should be taken to note the average differences in drying times under different atmospheric conditions, so that problems may be minimized. Joint treatment products must be thoroughly dry before successive coats are applied, and/or final decoration is applied. In all cases, a well venti lated area assists in the proper drying of these materials. The chart shown below indicates the average drying periods for joint treatment products under different temperature and humidity conditions. Relative Humidity Temperature F. 40 60 80 100 0 28 H 13 H 6H 3H H-hours 20% 40% 50% 60% 70% 80% 90% 98% 34 H 16 H 8H 4H 44 H 20 H 10 H 5H 2 D 2'/a D 3% D 4% Q 9 D 37 D 24 H 29 H 38 H 2% D 4 Vs 0 18 D 12 H 13% H 19% H 27 H 49 H 9D 6 H 8 H 10 H 14 H 26 H 5D D-days (24 hours) It is extremely important that the difference in absorption between the wallboard surface and the compound over joints and nails be equalized to assume uniformity of color, suction and tex ture over the entire wall or ceiling. After the joint treatment has been completed and thoroughly dried, the surfaces should be sealed or primed with a vinyl or oil base primer/sealer. 0 14 CAM 000993 PRODUCT PACKING Triple Duty Wallboard Joint Compound 25 lb bags : 50 lb bags Bedding Compound 25 lb. bags Topping Compound 25 lb bags 25 lb bags, All Purpose Joint Compound . 181b. bag with 250' roll of tape Ready Mix Joint Compound 1 6--5 lb. boxes to case 4--1 gal pails to case 5 gal. pails Speed Set Joint Compound 25 lb. bags Bestex," A Bestex:iJ B Bestex:u C Bestex^ D 25 lb. bags 40 lb. bags 40 lb. bags 40 lb. bags PRICE ----------------- - Joint System Packages , Package No. 1,18 ibs. Finisher, Single bags 250 ft. Tape Package No, 2, 4 Iba. Finisher, 60 ft. Tape 6 Packages to case Patching Plaster 6--5 lb. boxes to case I i CAM 000994 GYPSUM DIVISION 900 S W STH AVE PORTLAND OREGON 97207 IS-5-5 70 S SP CAM 000995