Gypsum Board ME- Building Group
SECTION 092900 - GYPSUM BOARD
PART 1 GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division1 Specification Sections, apply to this Section.
1.2 SUMMARY
A. This Section includes interior gypsum wallboard.
B. Related Sections include following:
1. Division7 Section "Joint Sealants" for sealing joints in adjoining substrates where air-tightness is required.
2. Division9 Section "Non-Structural Metal Framing."
3. Division9 Section "Tiling" for cementitious backer units installed as substrates for ceramic tile.
1.3 SUBMITTALS
A. Product Data: For each product indicated.
B. LEED Submittals:
1. Product Data for CreditMR4: For products having recycled content, manufacturer documentation indicating percentages by weight of postconsumer and preconsumer recycled content.
a. Include statement indicating costs for each product having recycled content.
2. Product Data for Credit MR 5: For products and materials to comply with requirements for regional materials, provide documentation indicating location of product or material manufacturing location and the point of extraction, harvest, or recovery for each raw material.
a. Include documentation on distance to project, contractor cost for each regional material, and percent by weight that is considered regional
3. Product Data for CreditIEQ4.1: For adhesives used to laminate gypsum board panels to substrates, documentation including printed statement of VOC content.
1.4 DELIVERY, STORAGE AND HANDLING
A. Store materials inside under cover and keep them dry and protected against weather, condensation, direct sunlight, construction traffic, and other potential causes of damage. Stack panels flat and supported on risers on a flat platform to prevent sagging.
1.5 FIELD CONDITIONS
A. Environmental Limitations: Comply with ASTMC840 requirements or gypsum board manufacturer's written recommendations, whichever are more stringent.
B. Do not install paper-faced gypsum panels until installation areas are enclosed and conditioned.
C. Do not install panels that are wet, those that are moisture damaged, and those that are 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.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. In other Part2 articles where subparagraph titles below introduce lists, following requirements apply for product selection:
1. Product: Subject to compliance with requirements, provide product specified.
2.2 PANEL PRODUCTS
A. Recycled Content of Gypsum Panel Products: Postconsumer recycled content plus one-half of preconsumer recycled content not less than 20 percent.
B. Regional Materials: Gypsum panel products shall be manufactured within 500 miles of Project site from materials that have been extracted, harvested, or recovered, as well as manufactured, within 500 miles of Project site.
C. Panel Size, General: Provide in maximum lengths and widths available that will minimize joints in each area and correspond with support system indicated.
D. Gypsum Wallboard: ASTMC1396.
1. Regular Type: In thickness indicated and with long edges tapered.
E. Sag-Resistant Gypsum Wallboard: ASTMC1396, manufactured to have more sag resistance than regular-type gypsum board, 1/2 inch thick, and with long edges tapered. Apply on ceiling surfaces.
F. Proprietary Abuse-Resistant Gypsum Wallboard: ASTMC1396, manufactured to produce greater resistance to surface indentation and through-penetration than standard gypsum panels, with core type and in thickness indicated, and with long edges tapered.
1. Products:
a. National Gypsum Company; Hi-Abuse XP Wallboard.
b. United States Gypsum Co.; SHEETROCK Brand Abuse-Resistant Gypsum Panels.
G. Tile Backing Panels:
1. Water-Resistant Gypsum Backing Board: ASTMC630/C630M, with core type and in thickness indicated.
2.3 TRIM ACCESSORIES
A. Interior Trim: ASTMC1047.
1. Cornerbead: Use at outside corners, unless otherwise indicated.
2. Bullnose Bead: Use at outside corners.
3. LC-Bead: Use at exposed panel edges.
4. L-Bead: Use where indicated.
5. U-Bead: Use where indicated.
6. Expansion (Control) Joint: Use where indicated.
2.4 JOINT TREATMENT MATERIALS
A. General: Comply with ASTMC475.
B. Joint Tape:
1. Interior Gypsum Wallboard: Paper.
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 and damaged surface areas, use setting-type taping compound.
2. Embedding and First Coat: For embedding tape and first coat on joints, flanges of trim accessories, and fasteners, use setting-type taping compound.
a. Use setting-type compound for installing paper-faced metal trim accessories.
3. Fill Coat: For second coat, use setting-type, sandable topping compound.
4. Finish Coat: For third coat, use drying-type, all-purpose compound.
5. Skim Coat (at north wall of lobby and other locations as indicated): For final coat of Level5 finish, 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 SEALANT
A. Acoustical joint sealant shall have a VOC content of 250g/L or less when calculated according to 40CFR59, SubpartD (EPA Method24).
B. Acoustical Sealant for Exposed and Concealed Joints: Nonsag, paintable, nonstaining, latex sealant complying with ASTMC834 that effectively reduces airborne sound transmission through perimeter joints and openings in building construction as demonstrated by testing representative assemblies according to ASTME90.
1. Acoustical Sealant for Exposed and Concealed Joints:
a. Pecora Corp.; AC-20 FTR Acoustical and Insulation Sealant.
b. United States Gypsum Co.; SHEETROCK Acoustical Sealant.
C. Acoustical Sealant for Concealed Joints: Nondrying, nonhardening, nonskinning, nonstaining, gunnable, synthetic-rubber sealant recommended for sealing interior concealed joints to reduce airborne sound transmission.
1. Acoustical Sealant for Concealed Joints:
a. Ohio Sealants, Inc.; Pro-Series SC-170 Rubber Base Sound Sealant.
b. Pecora Corp.; BA-98.
c. Tremco, Inc.; Tremco Acoustical Sealant.
D. Elastomeric Sealants: Provide manufacturer's standard chemically curing, elastomeric sealants of base polymer and characteristics indicated that comply with applicable requirements in Division7 Section "Joint Sealants."
1. Single-Component Nonsag Urethane: ASTMC920; TypeS; GradeNS; Class25; UsesT, M, A, and, as applicable to joint substrates indicated, O.
2.6 AUXILIARY MATERIALS
A. General: Provide auxiliary materials that comply with referenced installation standards and manufacturer's written recommendations.
B. Steel Drill Screws: ASTMC1002, unless otherwise indicated.
1. Use screws complying with ASTMC954 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.
C. Isolation Strip:
1. Asphalt-Saturated Organic Felt: ASTMD226, TypeI (No.15 asphalt felt), nonperforated.
2. Foam Gasket: Adhesive-backed, closed-cell vinyl foam strips that allow fastener penetration without foam displacement, 1/8 inch thick, in width to suit steel stud size.
D. Sound Attenuation Blankets: ASTMC665, TypeI (blankets without membrane facing) produced by combining thermosetting resins with mineral fibers manufactured from glass, slag wool, or rock wool.
1. Fire-Resistance-Rated Assemblies: Comply with mineral-fiber requirements of assembly.
PART 3 EXECUTION
3.1 PANEL PRODUCT INSTALLATION
A. Gypsum Board: Comply with ASTMC840 and GA-216.
1. Space screws maximum of 12 inches o.c. for vertical applications.
2. Space fasteners in panels that are tile substrates maximum of 8 inches o.c.
3. On ceilings, apply gypsum panels before wall/partition board application to greatest extent possible and at right angles to framing, unless otherwise indicated.
4. On partitions/walls, apply gypsum panels vertically (parallel to framing), unless otherwise indicated or required by fire-resistance-rated assembly, and minimize end joints.
a. Stagger abutting end joints not less than one framing member in alternate courses of board.
5. On Z-furring members, apply gypsum panels vertically (parallel to framing) with no end joints. Locate edge joints over furring members.
6. Single-Layer Fastening Methods: Apply gypsum panels to supports with steel drill screws.
7. Multilayer Fastening Methods: Fasten base layers and face layers separately to supports with screws.
B. Tile Backing Panels:
1. Water-Resistant Gypsum Backing Board: Install with 1/4-inch gap where panels abut other construction or penetrations.
C. Sound Control Assemblies: Seal construction at perimeters, behind control and expansion 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 ASTMC919 and manufacturer's written recommendations for locating edge trim and closing off sound-flanking paths around or through gypsum board assemblies, including sealing partitions above acoustical ceilings.
D. Air Tight Assemblies: Seal construction at perimeters, behind control and expansion joints, and at openings and penetrations with continuous bead of elastomeric sealant. Install elastomeric sealant at both faces of partitions at perimeters and through penetrations.
E. Vapor Barrier: Install to comply with requirements specified in Division7 Section "Vapor Barrier".
3.2 FINISHING
A. Installing Trim Accessories: 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. Finishing Gypsum Board Panels: 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.
1. Prefill open joints and damaged surface areas.
2. Apply joint tape over gypsum board joints, except those with trim having flanges not intended for tape.
C. Gypsum Board Finish Levels: Finish panels to levels indicated below, according to ASTMC840, for locations indicated:
1. Level1: Embed tape at joints in ceiling or floor plenum areas, concealed areas, and where indicated, unless higher level of finish is required for fire-resistance-rated assemblies and sound-rated assemblies.
2. Level2: Embed tape and apply separate first coat of joint compound to tape, fasteners, and trim flanges where panels are substrate for tile.
3. Level3: Where indicated on Drawings.
4. Level4: Embed tape and apply separate first, fill, and finish coats of joint compound to tape, fasteners, and trim flanges at panel surfaces that will be exposed to view.
5. Level5: Embed tape and apply separate first, fill, and finish coats of joint compound to tape, fasteners, and trim flanges, and apply skim coat of joint compound over entire surface for surfaces subject to severe lighting finish and elsewhere as required for high quality gypsum board finish.
END OF SECTION
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Revision Date: 01/21/14 Project & Bid Package
File name: 092900 GYPSUM BOARD