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HomeMy WebLinkAbout09 29 00 - Gypsum BoardBEARDSLEY DESIGN ASSOCIATES CORNELL – NCP GYPSUM BOARD STANDARD SPECIFICATIONS 09 29 00 PAGE 1 OF 7 NOVEMBER 2, 2012 SECTION 092900 GYPSUM BOARD PART 1 GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. This Section includes the following: 1. Interior gypsum board. 2. Exterior gypsum board for ceilings and soffits. 1.3 SUBMITTALS A. Product Data: For each type of product indicated. 1.4 QUALITY ASSURANCE A. FireResistanceRated Assemblies: For fireresi stancerated assemblies, provide materials and construction identical to those tested in assembly indicated according to ASTM E 119 by an independent testing agency. B. STCRated Assemblies: For STCrated assemblies, provide materials and construction identical to those tested in assembly indicated according to ASTM E 90 and classified according to ASTM E 413 by an independent testing agency. 1.5 STORAGE AND HANDLING A. Store materials inside under cover and keep them dry and protected against damage from weather, condensation, direct sunlight, construction traffic, and other causes. Stack panels flat to prevent sagging. 1.6 PROJECT CONDITIONS A. Environmental Limitations: Comply with ASTM C 840 requirements or gypsum board manufacturer's written recommendations, whichever are more stringent. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP GYPSUM BOARD STANDARD SPECIFICATIONS 09 29 00 PAGE 2 OF 7 NOVEMBER 2, 2012 PART 2 PRODUCTS 2.1 PANELS, GENERAL A. Size: Provide in maximum lengths and widths available that will minimize joints in each area and that correspond with support system indicated. 2.2 INTERIOR GYPSUM BOARD A. General: Complying with ASTM C 36/C 36M or ASTM C 1396/C 1396M, as applicable to type of gypsum board indicated and whichever is more stringent. 1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: a. USG Corporation. B. Type X: 1. Thickness: 5/8 inch (15.9 mm). 2. Long Edges: Tapered. 2.3 TRIM ACCESSORIES A. Interior Trim: ASTM C 1047. 1. Material: Galvanized or aluminumcoated steel s heet or rolled zinc. 2. Shapes: a. Cornerbead. b. Bullnose bead. c. LCBead: Jshaped; exposed long flange receives joint compound. d. LBead: Lshaped; exposed long flange receives joint compound. e. UBead: Jshaped; exposed short flange does not receive joint compound. f. Expansion (control) joint. g. CurvedEdge Cornerbead: With notched or flexibl e flanges. 2.4 JOINT TREATMENT MATERIALS A. General: Comply with ASTM C 475/C 475M. B. Joint Tape: 1. Interior Gypsum Wallboard: Paper. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP GYPSUM BOARD STANDARD SPECIFICATIONS 09 29 00 PAGE 3 OF 7 NOVEMBER 2, 2012 C. Joint Compound for Interior Gypsum Wallboard: For each coat use formulation that is compatible with other compounds applied on previous or for successive coats. 1. Prefilling: At open joints, rounded or beveled panel edges, and damaged surface areas, use settingtype taping compound. 2. Embedding and First Coat: For embedding tape and first coat on joints, fasteners, and trim flanges, use dryingtype, allp urpose compound. a. Use settingtype compound for installing paperf aced metal trim accessories. 3. Fill Coat: For second coat, use dryingtype, al lpurpose compound. 4. Finish Coat: For third coat, use dryingtype, a llpurpose compound. 5. Skim Coat: For final coat of Level 5 finish, use dryingtype, allpurpose compound. 2.5 AUXILIARY MATERIALS A. General: Provide auxiliary materials that comply with referenced installation standards and manufacturer's written recommendations. B. Laminating Adhesive: Adhesive or joint compound recommended for directly adhering gypsum panels to continuous substrate. C. Steel Drill Screws: ASTM C 1002, unless otherwise indicated. D. Sound Attenuation Blankets: ASTM C 665, Type I (blankets without membrane facing) produced by combining thermosetting resins with mineral fibers manufactured from glass, slag wool, or rock wool. 1. FireResistanceRated Assemblies: Comply with m ineralfiber requirements of assembly. PART 3 EXECUTION 3.1 EXAMINATION A. Examine areas and substrates, with Installer present, and including welded hollowmetal frames and framing, for compliance wit h requirements and other conditions affecting performance. B. Examine panels before installation. Reject panels that are wet, moisture damaged, and mold damaged. C. Proceed with installation only after unsatisfactory conditions have been corrected. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP GYPSUM BOARD STANDARD SPECIFICATIONS 09 29 00 PAGE 4 OF 7 NOVEMBER 2, 2012 3.2 APPLYING AND FINISHING PANELS, GENERAL A. Comply with ASTM C 840. B. Install ceiling panels across framing to minimize the number of abutting end joints and to avoid abutting end joints in central area of each ceiling. Stagger abutting end joints of adjacent panels not less than one framing member. C. Install panels with face side out. Butt panels together for a light contact at edges and ends with not more than 1/16 inch (1.5 mm) of open space between panels. Do not force into place. D. Locate edge and end joints over supports, except in ceiling applications where intermediate supports or gypsum board backbl ocking is provided behind end joints. Do not place tapered edges against cut edges or ends. Stagger vertical joints on opposite sides of partitions. Do not make joints other than control joints at corners of framed openings. E. Form control and expansion joints with space between edges of adjoining gypsum panels. F. Cover both faces of support framing with gypsum panels in concealed spaces (above ceilings, etc.), except in chases braced internally. 1. Unless concealed application is indicated or required for sound, fire, air, or smoke ratings, coverage may be accomplished with scraps of not less than 8 sq. ft. (0.7 sq. m) in area. 2. Fit gypsum panels around ducts, pipes, and conduits. 3. Where partitions intersect structural members projecting below underside of floor/roof slabs and decks, cut gypsum panels to fit profile formed by structural members; allow 1/4 to 3/8inch (6.4 t o 9.5mm) wide joints to install sealant. G. Isolate perimeter of gypsum board applied to nonloadbearing partitions at structural abutments, except floors. Provide 1/4 to 1/2inch (6.4 to 12.7 mm) wide spaces at these locations, and trim edges with edge trim where edges of panels are exposed. Seal joints between edges and abutting structural surfaces with acoustical sealant. H. Attachment to Steel Framing: Attach panels so leading edge or end of each panel is attached to open (unsupported) edges of stud flanges first. I. STCRated Assemblies: Seal construction at peri meters, behind control joints, and at openings and penetrations with a continuous bead of acoustical sealant. Install acoustical sealant at both faces of partitions at perimeters and through penetrations. Comply with ASTM C 919 and with manufacturer's written recommendations for locating edge trim and closing off soundflanking paths around or through assemblies, including sealing partitions above acoustical ceilings. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP GYPSUM BOARD STANDARD SPECIFICATIONS 09 29 00 PAGE 5 OF 7 NOVEMBER 2, 2012 J. Install sound attenuation blankets before installing gypsum panels, unless blankets are readily installed after panels have been installed on one side. 3.3 APPLYING INTERIOR GYPSUM BOARD A. Install interior gypsum board in the following locations: 1. Type X: All. B. SingleLayer Application: 1. On ceilings, apply gypsum panels before wall/partition board application to greatest extent possible and at right angles to framing, unless otherwise indicated. 2. On partitions/walls, apply gypsum panels vertically (parallel to framing), unless otherwise indicated or required by fireresi stancerated assembly, and minimize end joints. a. Stagger abutting end joints not less than one framing member in alternate courses of panels. b. At stairwells and other high walls, install panels horizontally, unless otherwise indicated or required by fireresistance rated assembly. 3. On Zfurring members, apply gypsum panels vertic ally (parallel to framing) with no end joints. Locate edge joints over furring members. 4. Fastening Methods: Apply gypsum panels to supports with steel drill screws. C. Multilayer Application: 1. On ceilings, apply gypsum board indicated for base layers before applying base layers on walls/partitions; apply face layers in same sequence. Apply base layers at right angles to framing members and offset facelayer joints 1 framing member, 16 inche s (400 mm) minimum, from parallel baselayer joints, unless otherwise i ndicated or required by fireresistancerated assembly. 2. On partitions/walls, apply gypsum board indicated for base layers and face layers vertically (parallel to framing) with joints of base layers located over stud or furring member and facelayer joints o ffset at least one stud or furring member with baselayer joints, unless ot herwise indicated or required by fireresistancerated assembly. Stagge r joints on opposite sides of partitions. 3. Fastening Methods: Fasten base layers and face layers separately to supports with screws. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP GYPSUM BOARD STANDARD SPECIFICATIONS 09 29 00 PAGE 6 OF 7 NOVEMBER 2, 2012 3.4 INSTALLING TRIM ACCESSORIES A. General: For trim with back flanges intended for fasteners, attach to framing with same fasteners used for panels. Otherwise, attach trim according to manufacturer's written instructions. B. Control Joints: Install control joints according to ASTM C 840 and in specific locations approved by Architect for visual effect. C. Interior Trim: Install in the following locations: 1. Cornerbead: Use at outside corners. 2. Bullnose Bead: Use at outside corners. 3. LCBead: Use at exposed panel edges. 4. LBead: Use where indicated. 5. UBead: Use at exposed panel edges. 6. CurvedEdge Cornerbead: Use at curved openings. 3.5 FINISHING GYPSUM BOARD A. General: Treat gypsum board joints, interior angles, edge trim, control joints, penetrations, fastener heads, surface defects, and elsewhere as required to prepare gypsum board surfaces for decoration. Promptly remove residual joint compound from adjacent surfaces. B. Prefill open joints, rounded or beveled edges, and damaged surface areas. C. Apply joint tape over gypsum board joints, except those with trim having flanges not intended for tape. D. Gypsum Board Finish Levels: Finish panels to levels indicated below and according to ASTM C 840: 1. Level 1: Ceiling plenum areas, concealed areas, and where indicated. 2. Level 4: At panel surfaces that will be exposed to view, unless otherwise indicated. a. Primer and its application to surfaces are specified in other Division 09 Sections. 3. Level 5: Walls and ceilings scheduled to receive semigloss or gloss paint finish. a. Primer and its application to surfaces are specified in other Division 09 Sections. 3.6 PROTECTION A. Protect installed products from damage from weather, condensation, direct sunlight, construction, and other causes during remainder of the construction period. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP GYPSUM BOARD STANDARD SPECIFICATIONS 09 29 00 PAGE 7 OF 7 NOVEMBER 2, 2012 B. Remove and replace panels that are wet, moisture damaged, and mold damaged. 1. Indications that panels are wet or moisture damaged include, but are not limited to, discoloration, sagging, or irregular shape. 2. Indications that panels are mold damaged include, but are not limited to, fuzzy or splotchy surface contamination and discoloration. END OF SECTION 092900