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Finishing Drywall 5 Systems - USG

1555 Finishing Drywall SystemsLevels of Gypsum FinishingThe finished appearance of a Drywall wall or ceiling is largely depen-dent upon the quality of the framing job and the care exercised inapplying the Drywall panels. The better the framing and cladding, theeasier it is to have a near-perfect wall. Once that is accomplished, thelast remaining challenge is to finish the joints to meet your appearanceexpectations. This chapter helps you determine the level of quality youneed in your finish and shows you how to obtain that various organizations provide information about recommendedstandards or tolerances for Finishing of Drywall joints. See pages 435 and442 in the Appendix for information about standards and instructions on the safe use of joint compounds, texturing materialsand related products, see Chapter 13, Safety Considerations, documents traditionally have used nonspecific terms such as industry standards or workmanlike finish to describe how finishedgypsum board walls and ceilings should look.

Level 0 Used in temporary construction or wherever the final decora-tion has not been determined. Unfinished. No taping, finishing or cor-ner beads are required. Also could be used where non-predecorated panels will be used in demountable-type partitions which are to be painted as a final finish.

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Transcription of Finishing Drywall 5 Systems - USG

1 1555 Finishing Drywall SystemsLevels of Gypsum FinishingThe finished appearance of a Drywall wall or ceiling is largely depen-dent upon the quality of the framing job and the care exercised inapplying the Drywall panels. The better the framing and cladding, theeasier it is to have a near-perfect wall. Once that is accomplished, thelast remaining challenge is to finish the joints to meet your appearanceexpectations. This chapter helps you determine the level of quality youneed in your finish and shows you how to obtain that various organizations provide information about recommendedstandards or tolerances for Finishing of Drywall joints. See pages 435 and442 in the Appendix for information about standards and instructions on the safe use of joint compounds, texturing materialsand related products, see Chapter 13, Safety Considerations, documents traditionally have used nonspecific terms such as industry standards or workmanlike finish to describe how finishedgypsum board walls and ceilings should look.

2 This practice often haslead to misunderstanding about the degree of Finishing sophisticationrequired for any particular collective effort of four industry trade associations Association ofthe Wall and Ceiling Industries-International (AWCI), Ceilings andInterior Systems construction Association (CISCA), Gypsum Association(GA) and Painting and Decorating Contractors of America (PDCA) hasresulted in the adoption of industry-wide recommended specificationson levels of gypsum board finish. The work identifies five specific lev-els of Finishing , enabling architects to more closely identify the sophis-tication required and allowing for better competitive bidding amongcontractors. ASTM recognized this specification by including the levelsof gypsum board Finishing in ASTM factors used in determining the sophistication level requiredinclude the location of the work to be done, type and angle of surfaceillumination (both natural and artificial lighting), orientation of the pan-els during installation (see page 96), type of paint or wall covering tobe used and method of application.

3 Critical lighting conditions,glosspaints and thin wall coverings require a high level of finish, while heav-ily textured surfaces or surfaces that will be decorated with heavy-gauge wall coverings require less of the five levels of Finishing are provided below,togetherwith a matrix that helps detail how each level of Finishing is achieved,using SHEETROCKB rand joint treatment and Finishing products, and theappearance of the finished wall that may be anticipated for each of SHEETROCKB rand joint treatment products to joints,beads, trims and corners is described on pages 161-167. The numberof layers of compound and the degree of Finishing advances to meetthe requirements of each Level DefinitionsThe following Finishing level definitions are based on GA-214-96, Recommended Levels of Gypsum Board Finish, and are intended toprovide an industry standard for Drywall 0 Used in temporary construction or wherever the final decora-tion has not been determined.

4 Unfinished. No taping, Finishing or cor-ner beads are required. Also could be used where non-predecoratedpanels will be used in demountable-type partitions which are to bepainted as a final 1 Frequently used in plenum areas above ceilings, in attics, inareas where the assembly would generally be concealed or in buildingservice corridors and other areas not normally open to public degree of sound and smoke control is provided; in some geo-graphic areas, this level is referred to as fire-taping, although thislevel of finish does not typically meet fire-resistant assembly require-ments. Where a fire resistance rating is required for the gypsum boardassembly, details of construction should be in accordance with reportsof fire tests of assemblies that have met the requirements of the firerating joints and interior angles shall have tape embedded in joint com-pound. Accessories are optional at specifier discretion in corridors andother areas with pedestrian traffic.

5 Tape and fastener heads need notbe covered with joint compound. Surface shall be free of excess jointcompound. Tool marks and ridges are 2 May be used with setting-type compound for areas wherewater-resistant gypsum backing board, specification ASTM C630, isused as a substrate for tile. It may also be specified for standard gyp-sum board surfaces in garages, warehouse storage or other similarareas where surface appearance is not of primary joints and interior angles shall have tape embedded in joint com-pound and shall be immediately wiped with a joint knife or trowel, leav-ing a thin coating of joint compound over all joints and interior heads and accessories shall be covered with a coat of jointcompound. Surface shall be free of excess joint compound. Tool marksand ridges are 3 Typically used in areas which are to receive heavy texture(spray or hand applied) finishes before final painting, or where com-mercial-grade (heavy duty) wallcoverings are to be applied as the finaldecoration.

6 This level of finish should not be used where smooth paint-ed surfaces or where lighter weight wallcoverings are specified. Theprepared surface shall be coated with a Drywall primer prior to theapplication of final joints and interior angles shall have tape embedded in joint com-pound and shall be immediately wiped with a joint knife or trowel, leav-ing a thin coating of joint compound over all joints and interior additional coat of joint compound shall be applied over all jointsand interior angles. Fastener heads and accessories shall be coveredwith two separate coats of joint compound. All joint compounds shallbe smooth and free of tool marks and ridges. The prepared surface5157 Finishing Drywall Systems shall be covered with a Drywall primer prior to the application of thefinal 4 This level should be used where residential grade (light duty)wall coverings, flat paints or light textures are to be pre-pared surface shall be coated with a Drywall primer prior to the appli-cation of final finishes.

7 Release agents for wall coverings are specifi-cally formulated to minimize damage if coverings are subsequentlyremoved. The weight, texture and sheen level of the wallcovering mate-rial selected should be taken into consideration when specifying wall-coverings over this level of Drywall treatment. Joints and fastenersmust be sufficiently concealed if the wallcovering material is light-weight, contains limited pattern, has a glossy finish or has any combi-nation of these features. In critical lighting areas, flat paints appliedover light textures tend to reduce joint photographing. Gloss, semiglossand enamel paints are not recommended over this level of joints and interior angles shall have tape embedded in joint com-pound and shall be immediately wiped with a joint knife or trowel, leav-ing a thin coating of joint compound over all joints and interior addition, two separate coats of joint compound shall be applied overall flat joints and one separate coat of joint compound applied overinterior angles.

8 Fastener heads and accessories shall be covered withthree separate coats of joint compound. All joint compounds shall besmooth and free of tool marks and ridges. The prepared surface shallbe covered with a Drywall primer prior to the application of the 5 The highest quality finish is the most effective method to pro-vide a uniform surface and minimize the possibility of joint pho-tographing and of fasteners showing through the final decoration. Thislevel of finish is required where gloss, semigloss or enamel are speci-fied. or when flat joints are specified over an untextured surface, orwhere critical lighting conditions occur. The prepared surface shall becoated with a Drywall primer prior to the application of final joints and interior angles shall have tape embedded in joint com-pound and immediately wiped with a joint knife or trowel, leaving a thincoating of joint compound over all joints and interior angles.

9 Two sep-arate coats of joint compound shall be applied over all flat joints andone separate coat of joint compound applied over interior heads and accessories shall be covered with three separatecoats of joint compound. A thin skim coat of joint compound shall betrowel applied to the entire surface. Excess compound is immediatelysheared off, leaving a film or skim coating of compound completelycovering the paper. As an alternative to a skim coat, a material manu-factured especially for this purpose may be applied. The surface mustbe smooth and free of tool marks and ridges. The prepared surfaceshall be covered with a Drywall primer prior to the application of thefinal following matrix helps define the expected appearance of eachlevel and basic requirements for achieving that level. Additional guide-lines are offered for meeting the specified finish level using SHEETROCKB rand products and application Level Matrix Finishing LevelFinal AppearanceHow To Achieve ResultJoints &Accessories &SurfaceInterior AnglesFasteners5 Entire surface covered with As in Level 4As in Level 4 SHEETROCKB rand Primera) SHEETROCKB rand PrimerSurfacer (TUFF-HIDE) orSurfacer (TUFF-HIDE) orskim coat and primeb) Skim coat of compoundwith CGC First Coat,and ready to prime beforeSYNKOB rand Pre-Coat decorating with gloss, semiglossbefore painting or enamel texturing4No marks or separate Three separate Joints filled and Ready for priming, followed coats of coats of smoothed wallcoverings, flat paints compoundcompoundShall be primed withor light Level 2 CGC First Coatbefore paintingor texturing3No marks or separateTwo separateJoints filled andReady for priming, to becoat of coats of smooth.

10 Shall be followed by heavy with CGCover Level 2 First Coat beforepainting or texturing2 Tool marks and and ridges Tape embeddedOne coat ofFree of excess okay. Thin coating ofin compound compoundcompoundcompound covers tape; oneand immediatelyone coat compound over wiped to leave a fastener coating of compound over tape1 Tool marks andTape embedded Optional Free of excessridges compoundOne coat of compoundcompound0 UnfinishedNoneRecommended Levels of Paint Finish Over Gypsum Board The recommended level of paint finish over gypsum board wall andceiling surfaces varies depending on location in the structure,the typeof paint applied, the finish achieved on the gypsum board substrateprior to final decoration and the type of illumination striking the sur-face. The following recommendations from the Drywall FinishingCouncil Incorporated describe various levels of paint finish as the finaldecoration over new interior gypsum board 0No painting required.