SECTION GYPSUM BOARD

Transcription

1 SECTION GYPSUM BOARD PART 1 - GENERAL 1.01 SUMMARY A. Section Includes 1. Gypsum board screw attached to wood framing and furring members, joint treatment, and accessories. 2. Installation of sound deadening insulation in walls and ceilings and including acoustical sealant, tape, and the like for work of this Section. B. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. C. Related Sections 1. Section Building Insulation: Provision of building insulation. 2. Section Joint Sealants: Provision of caulking and sealants. 3. Section Painting and Coating: For finish painting REFERENCES A. ASTM - American Society for Testing and Materials 1. C475 - Standard Specification for Joint Compound and Joint Tape for Finishing Gypsum Board. 2. C514 - Standard Specification for Nails for the Application of Gypsum Board. 3. C840 - Standard Specification for Application and Finishing of Gypsum Board. 4. C Standard Specification for Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs. 5. C Standard Specification for Accessories for Gypsum Wallboard and Gypsum Veneer Base. 6. C Standard Specification for Gypsum Board. 7. E119 - Standard Test Methods for Fire Tests of Building Construction and Materials. B. BMC - Berkeley Municipal Code 1. Resolution No. 62,259-N.S. - Environmentally Preferable Purchasing Policy (EPP). C. CBC - California Building Code, 2013 Edition D. CFR - Code of Federal Regulations CFR 59 - National Volatile Organic Compound Emission Standards for Consumer and Commercial Products. E. EPA - Environmental Protection Agency 1. Method 24 - Determination of Volatile Matter Content, Water Content, Density, Volume Solids, and Weight Solids of Surface Coatings. F. GA - Gypsum Association Using Gypsum Board for Walls and Ceilings Recommended Levels of Gypsum Board Finish Application and Finishing of Gypsum Panel Products Fire Resistance Design Manual Gypsum Board

2 G. UL - Underwriters Laboratories Inc. 1. FRD - Fire Resistance Directory SYSTEM DESCRIPTION A. Performance Requirement: This Section shall comply with the purchasing policy requirements of BMC Resolution No. 62,259-N.S SUBMITTALS A. Product Data: Submit manufacturer s product data. Include the following 1. Fire Resistance Data: Include required fire test results for gypsum board systems on partitions and ceilings. 2. Sound Transmission Data: Include certified evidence that installed gypsum board systems and materials meet required STC levels QUALITY ASSURANCE A. Fire Test Response Characteristics: Where fire resistance rated gypsum board assemblies are indicated, provide gypsum board assemblies that comply with the following requirements: 1. Fire Resistance Ratings: As indicated by GA File Numbers in GA 600 or design designations in UL FRD or in the listing of another testing and inspecting agency acceptable to authorities having jurisdiction. 2. Gypsum board assemblies indicated are identical to assemblies tested for fire resistance according to ASTM E119 by an independent testing and inspecting agency acceptable to authorities having jurisdiction. PART 2 - PRODUCTS 2.01 MANUFACTURERS A. Acceptable Manufacturers: United States Gypsum Co.; Gold Bond Building Products Div., National Gypsum Co.; Pacific Coast Building Products, Pabco Gypsum Division, or equal MATERIALS A. Gypsum Board: Fire rated board for fire resistance rated assemblies, ASTM C1396, Type X, tapered edges, 48 inches wide, 5/8-inch thick. B. Screws: ASTM C1002, machine thread for gypsum board to metal attachments. C. Nails: ASTM C514, wood thread for metal or gypsum board attachment to wood. D. Insulation: As specified in Section E. Adhesives: Use adhesives that have a VOC content of 50 g/l or less when calculated according to 40 CFR 59, Subpart D (EPA Method 24). F. Corner Beads and Casing Beads: ASTM C1047, sheet steel zinc coated by hot-dip process. Use bullnose corner beads at typical wall and ceiling outside corners. Use square corner beads at windows Gypsum Board

3 G. Joint Treatment Materials: Products of one manufacturer conforming to ASTM C475, ASTM C840, and recommendations of manufacturer of both gypsum board and joint treatment materials for application indicated. Conform to GA 201 and GA 216 for reinforcing tape, joint compound, and water. 1. Joint Tape a. Cross-laminated, tapered edge, reinforced paper, or fiber glass mesh tape as recommended by setting type joint compound manufacturer. b. For silicone treated gypsum backer board, use 2 inch wide, 10-inch by 10-inch woven glass mesh tape. 2. Setting Type Joint Compound: Factory prepackaged, job mixed, chemical hardening powder products formulated for uses indicated or factory premixed product. Use hot type at exterior gypsum soffits. H. Acoustical Sealant: As specified in Section FINISHES A. Levels of Gypsum Board Finish as Defined by GA 214. Levels are only examples and do not constitute a schedule of finish. See Drawings for levels of finish. 1. Level 0: No taping, finishing, or accessories required. 2. Level 1: All joints and interior angles shall have tape set in joint compound. Surface shall be free of excess joint compound. Tool marks and ridges are acceptable. 3. Level 2: All joints and interior angles shall have tape embedded in joint compound and wiped with a joint knife leaving a thin coating of joint compound over all joints and interior angles. Fastener heads and accessories shall be covered with a coat of joint compound. Surface shall be free of excess joint compound. Tool marks and ridges are acceptable. Joint compound applied over the body of the tape at the time of tape embedment shall be considered a separate coat of joint compound and shall satisfy the conditions of this level. 4. Level 3: All joints and interior angles shall have tape embedded in joint compound and one additional coat of joint compound applied over all joints and interior angles. Fastener heads and accessories shall be covered with two separate coats of joint compound. All joint compound shall be smooth and free of tool marks and ridges. Note: It is recommended that the prepared surface be coated with a drywall primer prior to the application of final finishes. 5. Level 4: All joints and interior angles shall have tape embedded in joint compound and two separate coats of joint compound applied over all flat joints and one separate coat of joint compound applied over interior angles. Fastener heads and accessories shall be covered with three separate coats of joint compound. All joint compound shall be smooth and free of tool marks and ridges. Note: It is recommended that the prepared surface be coated with a drywall primer prior to the application of final finishes. 6. Level 5: All joints and interior angles shall have tape embedded in joint compound and two separate coats of joint compound applied over all flat joints and one separate coat of joint compound applied over interior angles. Fastener heads and accessories shall be covered with three separate coats of joint compound. A thin skim coat of joint compound trowel applied, or a material manufactured especially for this purpose and applied in accordance with manufacturer s recommendations, shall be applied to the entire surface. The surface shall be smooth and free of tool marks and ridges. Note: It is recommended that the prepared surface be coated with a drywall primer prior to the application of finish paint. B. Finish: Level 4 at all new gypsum board Gypsum Board

4 PART 3 - EXECUTION 3.01 INSTALLATION A. Gypsum Board 1. Install and finish gypsum board to comply with ASTM C840 or GA 216. a. Single Layer: Install in accordance with ASTM C840, except as amended or required by specific fire resistive or sound isolation system detailed. In that instance, application shall conform to requirements of the manufacturer s tests as reviewed and accepted in the submittal. b. Double Layer: Conform to applicable portions of ASTM C840, System Classification VIII for installations applied with screws. Conform to required fire resistance standards. 2. Apply in horizontal direction with ends and edges falling on supports. Gypsum board shall be of maximum length possible to reach full wall or ceiling lengths with minimal number of joints. 3. Position boards so that like edges abut, tapered edges against tapered edges and field cut ends against field cut ends. Do not place tapered edges against cut edges or ends. Stagger vertical joints over different studs on opposite sides of partitions. 4. Start installation of panels at exterior wall to position butt joints as far away from exterior wall as possible. B. Fire Resistant Assemblies: Wherever fire rated gypsum board construction is indicated, provide materials and installation methods, including types and spacing of fasteners, in accordance with CBC, GA Manual, or listed assembly indicated. Apply firestopping at top of wall and at penetrations through fire resistant assembly. C. Sound Retardant Installations: Follow manufacturer s directions and specifications for conditions of installation. Install where indicated in conformance with current Project acoustic report. Install from floor surface to bottom side of next floor surface. 1. Wrap with insulation and Lowry Pads and seal electrical or other outlets in sound isolating partitions. 2. Install sealant to completely fill void between gypsum board edges and adjacent surface. D. Wet Locations 1. At Walls and Ceilings: Conform to ASTM C840, System Classification X. 2. Treat cut edges and holes in water resistant gypsum board with sealant. E. Fastenings: Attach gypsum board to framing with screws, lengths and sizes as recommended by manufacturer and in accordance with CBC. F. Accessories 1. Install corner beads at vertical and horizontal external corners; tape inside corners. 2. Install casing beads whenever edge of gypsum board would otherwise be exposed or semi-exposed, or where abutting dissimilar materials. 3. After accessories are installed, correct surface damage and defects. 4. Install trims and expansion joints where required. 5. Resilient Channel Attachment: Screw attach resilient channel through foot on 1 side of channel only to wood joists. Screw attach gypsum board through channel face only. At resilient channel assemblies, screw attached gypsum board shall not be in contact with joists, studs, or any rigid fastening Gypsum Board

5 G. Allowable Tolerances 1. Offset Between Planes of Board Faces: 1/16-inch. 2. Plane, Level, Warp and Bow: 1/8-inch in 8 feet. 3. Shim panels as necessary to comply with tolerances FINISHING OF GYPSUM BOARD SOUTH BERKELEY SENIOR CENTER A. Apply joint treatment at gypsum board joints; flanges of corner bead, edge trim and penetrations, fastener heads and surface defects in accordance with ASTM C840 or GA 216. Number of coats of treatment shall be as specified above. B. Finish Painting: As specified in Section C. Previously Wallpapered Surfaces 1. Install ¼ gyp bd over existing wall paper. Remove existing wallpaper where indicated; ensure all remaining coatings and adhesives that are incompatible with finish paint are removed. 2. Apply skim coat to gypsum board in accordance with level 5 finish specified in Article 2.03 A.6. END OF SECTION Gypsum Board

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