SECTION 092900 GYPSUM BOARD PART 1 - GENERAL 1.1 SUMMARY A. Section Includes: 1. Interior gypsum wallboard. 2. Tile backing panels. B. Related Sections: 1. Section 012300 Alternates. 1.2 SUBMITTALS A. Product Data: For each product indicated. B. Samples: For the following products: 1. Trim Accessories: Full-size Sample in 12-inch long length for each trim accessory indicated. 1.3 QUALITY ASSURANCE A. Mock-ups: Before beginning gypsum board installation, install a mock-up of at least 100 square feet in surface area to demonstrate aesthetic and set quality standards for materials and execution at location to be determined by Architect. 1. Install mock-ups for each level of gypsum board finish indicated for use in exposed locations. 2. Apply or install final decoration indicated, including painting, on exposed surfaces for review of mock-ups. 3. Simulate finished lighting conditions for review of mock-ups. 4. Approved mock-ups may become part of completed Work if undisturbed at time of Substantial Completion. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Gypsum Materials: Subject to compliance with requirements, provide products from 1 of the following manufacturers: 1. American Gypsum Co. 2. BPB America Inc. 3. G-P Gypsum Corp. 4. Lafarge North America Inc. 5. National Gypsum Company. 6. PABCO Gypsum. 7. Temple-Inland. 8. USG Corporation. 9. Approved Substitutions. 2.2 GYPSUM WALLBOARD A. Panel Size: Provide in maximum lengths and widths available that will minimize joints in each area and correspond with support system indicated. INTERIORS PACKAGE 092900-1 OF 6 GYPSUM BOARD
B. Fire-Rated Gypsum Board (GWB-1): ASTM C36; gypsum core wall panel with additives to enhance fire resistance of core and surfaced with paper on front, back and long edges; Type X, UL rated. C. Fire-Rated Moisture Resistant Gypsum Board (GWB-2): ASTM C630; gypsum core wall panel with additives to enhance fire resistance of core and water resistance of core. Surface with water repellent paper on front, back, and long edges; Type X, UL rated. 3. Acceptable products: SheetRock Brand Mold Tough Firecode Gypsum Panels by USG Corporation or approved substitution. D. Moisture-Resistant Gypsum Board (GWB-3): ASTM 3273; engineered gypsum/cellulose-fiber combination core wall panel with additives to enhance fire resistance of core and surfaced with fiberreinforced front, back, and long edge. Type X, UL rated. 1. Maximum framing spacing is 16 inches on center. 2. Size: 5/8 inch thick by 36 inches wide by 5 feet long. 3. Edges: Cut square. 4. Acceptable Products: a. Custom Building Products: Wonderboard. b. FinPan, Inc.: Util-A-Crete Concrete Backer Board. c. USG Corporation.: FibeRock Aqua-Tough Gypsum Panels. E. Fire-Rated, Fiber-Reinforced, Abuse-Resistant Gypsum Board (GWB-4): ASTM C1278; fiberglass reinforced gypsum core wall panel with additives to enhance fire resistance of core and surfaced with heavy natural finish paper on front, back, and long edge. Type X, UL rated. 3. Acceptable products: a. G-P Gypsum Corporation: ToughRock Abuse-Resistant Gypsum Board. b. National Gypsum Company: Gold Bond Hi-Abuse Wallboard. c. USG Corporation: SheetRock Brand Abuse-Resistant Gypsum Panels. F. Ceiling Type (GWB-5): ASTM C36; gypsum core ceiling panel with additives to enhance sag resistance of core. Surface with paper on front, back, and long edges. G. High-IMpact Gypsum Board (GWB-6): ASTM C1278; fiberglass reinforced gypsum core wall panel with additives to enhance fire resistance of core and surfaced with heavy natural finish paper on front, back, and long edge. Type X, UL rated. 2. Edges: Square cut, tapered long edges for joint reinforcement. 3. Acceptable products: a. USG Corporation.: FibeRock VHI Brand Abuse-Resistant Gypsum Panels or approved substitution. 2.3 TRIM ACCESSORIES A. Interior Trim: ASTM C1047. 1. Material: Paper-faced galvanized steel sheet. 2. Shapes: a. Cornerbead. b. LC-Bead: J-shaped; exposed long flange receives joint compound. c. L-Bead: L-shaped; exposed long flange receives joint compound. GYPSUM BOARD 092900-2 OF 6 INTERIORS PACKAGE
d. U-Bead: J-shaped; exposed short flange does not receive joint compound. e. Expansion (control) joint. f. Curved-Edge Cornerbead: With notched or flexible flanges. 2.4 JOINT TREATMENT MATERIALS A. General: Comply with ASTM C475/C475M. B. Joint Tape: 1. Interior Gypsum Wallboard: Paper as recommended by manufacturers. 2. Tile Backing Panels: As recommended by panel manufacturer. 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, beveled panel edges, and damaged surface areas, use setting-type taping compound. 2. Embedding and First Coat: For embedding tape and first coat on joints, fasteners, and trim flanges, use setting-type taping compound. a. Use setting-type compound for installing paper-faced metal trim accessories. 3. Fill Coat: For second coat, use drying-type, all-purpose compound. 4. Finish Coat: For third coat, use drying-type, all-purpose compound. D. Joint Compound for Tile Backing Panels: 1. Water-Resistant Gypsum Backing Board: Use setting-type taping and setting-type, sandable topping compounds. 2.5 SOUND ATTENUATION INSULATION A. Provide sound-attenuating materials with a flame spread index of 0 and smoke developed index of 0 when tested per ASTM E 84. 1. Recycled Content: Provide blankets with recycled content such that postconsumer recycled content plus 1/2 of preconsumer recycled content constitutes a minimum of 90 percent by weight. 2. See Sound Attenuation Insulation schedule on Sheet A3.00 for acoustical insulation locations in gypsum board ceilings. 2.6 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. 1. Use adhesives that have a VOC content of 50 g/l or less when calculated per 40 CFR 59, Subpart D (EPA Method 24). C. Steel Drill Screws: ASTM C1002, unless otherwise indicated. 1. Use screws complying with ASTM C954 for fastening panels to steel members from 0.033 to 0.112 inch thick. 2. For fastening cementitious backer units, use screws of type and size recommended by panel manufacturer. D. Acoustical Sealant: As specified in Section 079200 Joint Sealants. E. Thermal Insulation: As specified in Section 072100 Thermal Insulation. F. Provide other materials, not specifically described, but required for complete and proper installation, as selected by Contractor subject to approval of Architect. INTERIORS PACKAGE 092900-3 OF 6 GYPSUM BOARD
PART 3 - EXECUTION 3.1 APPLYING AND FINISHING PANELS, GENERAL A. Comply with ASTM C840. B. Examine panels before installation. Reject panels that are wet, moisture damaged, and mold damaged. C. Install ceiling panels across framing to minimize 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 1 framing member. D. Install panels with face side out. Butt panels together for a light contact at edges and ends with not more than 1/16 inch of open space between panels. Do not force into place. E. Locate edge and end joints over supports, except in ceiling applications where intermediate supports or gypsum board back-blocking 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. F. Form control and expansion joints with space between edges of adjoining gypsum panels. G. 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 square feet 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 3/8 inch wide joints to install sealant. H. Isolate perimeter of gypsum board applied to non-load-bearing partitions at structural abutments, except floors. Provide 1/4 to 1/2 inch 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. I. Attachment to Steel Framing: Attach panels so leading edge or end of each panel is attached to open (unsupported) edges of stud flanges first. 3.2 ACOUSTICALLY RATED PARTITIONS A. Install sound attenuation blankets before installing gypsum panels, unless blankets are readily installed after panels have been installed on one side. 1. See Sheet A6.01 for location of acoustically rated partitions. B. Acoustically Rated Partitions: Seal construction at perimeters, behind control joints, and at openings and penetrations with continuous bead of acoustical sealant. Install acoustical sealant at both faces of partitions at perimeters and through penetrations. Comply with ASTM C919 and with manufacturer's written recommendations for locating edge trim and closing off sound-flanking paths around or through assemblies, including sealing partitions above acoustical ceilings. C. Acoustical sealant shall close gaps between service outlets (electrical, telephone and data) and wallboard. 1. Apply continuous bead of acoustical sealant between bottom track and slab at all locations, not just at acoustically rated partitions. 2. Apply acoustical sealant to back of electrical J-boxes for power, telephone and data prior to installation of gypsum wallboard. D. Partitions shall be cut and sealed around structural elements. GYPSUM BOARD 092900-4 OF 6 INTERIORS PACKAGE
E. No wallboard layers shall be continuous between 2 adjacent rooms. F. Gaps around penetrations (ducts, pipes and conduit) shall be sealed as follows: 1. Tightly fill gaps 1 inch or less with attenuation batt insulation. 2. Fill gaps larger than 1 inch with heavy-density putty such as 3M Moldable Putty. 3.3 APPLYING INTERIOR GYPSUM BOARD A. Install interior gypsum board in the following locations: 1. GWB-1: Use throughout except where indicated otherwise. 2. GWB-5: Ceiling surfaces where indicated on Drawings. 3. GWB-2 and -3: As indicated on Drawings. 4. GWB-4: Use per Add Alternate-6. See Sheet A2.03 for scope. 5. GWB-6: Use in horizontal applications at exposed lid of Entry Block as indicated on Sheet A2.03. 3.4 APPLYING TILE BACKING PANELS A. GWB-3: Install where indicated. Install with 1/4 inch gap where panels abut other construction or penetrations. B. Areas Not Subject to Wetting: Install regular-type gypsum wallboard panels to produce a flat surface except at showers, tubs, and other locations indicated to receive water-resistant panels. C. Where tile backing panels abut other types of panels in same plane, shim surfaces to produce a uniform plane across panel surfaces. 3.5 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 per manufacturer's written instructions. B. Control Joints: Install control joints per ASTM C840 and GA-216, and in specific locations indicated on Drawings. 1. Advise Architect if additional control joints are required or necessary per referenced standards, and provide these control joints at no additional Cost to Owner. C. Interior Trim: Install in the following locations: 1. Cornerbead: Use at outside corners, unless otherwise indicated. 3.6 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, per ASTM C840, for locations indicated: 1. Base Level: No taping, finishing, or accessories required. a. Use above suspended ceilings and within other concealed spaces, unless assembly is fire rated, sound rated, sound or smoke controlled, or unless space serves as an air plenum. 2. Level 1: Embed tape in joint compound at joints. Leave surface free of excess joint compound. Tool marks and ridges are acceptable. INTERIORS PACKAGE 092900-5 OF 6 GYPSUM BOARD
a. Use above suspended ceilings and within other concealed spaces where gypsum board assembly serves as an air plenum. 3. Level 2: Embed tape in joint compound at joints and apply 1 separate coat of joint compound applied over joints, angles, fastener heads, trim flanges, and accessories. Provide Level 2 finish at the following conditions: a. Water resistant gypsum board indicated for use as substrate for ceramic tile. 4. Level 4: Embed tape in joint compound at joints and apply 3 separate coats of joint compound applied over joints, angles, fastener heads, trim flanges, and accessories. Apply joint compound smooth and free of tool marks and ridges. Provide Level 4 finish at the following conditions: a. Gypsum board indicated to be exposed to view except where indicated for other finish levels. 3.7 PROTECTION A. Protect installed products from damage from weather, condensation, direct sunlight, construction, and other causes during remainder of construction period. B. Remove and replace panels that are wet, moisture damaged, and mold damaged. 1. Indications that panels are wet or moisture damaged include discoloration, sagging, or irregular shape. 2. Indications that panels are mold damaged include fuzzy or splotchy surface contamination and discoloration. END OF SECTION GYPSUM BOARD 092900-6 OF 6 INTERIORS PACKAGE