GA 253-2012_en APPLICATION OF GYPSUM SHEATHING《》.pdf
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1、GA-253-12 Copyright Gypsum Association 2012. All rights reserved. Printed in U.S.A. APPLICATION OF GYPSUM SHEATHING (GA-253-12e) 1. Scope 1.1 This specification describes the minimum requirements for, and the methods of handling, storage, and application of, gypsum sheathing for use as a substrate f
2、or exterior claddings. 1.1.1 Exterior claddings shall be provided to protect gypsum sheathing from long-term weather exposure. (See section 6.1 for short-term exposure.) 1.1.2 Exterior claddings and their application methods shall be the responsibility of those making the recommendation. Consult the
3、 local building code or cladding manufacturer to determine when a water-resistive barrier is required. 1.2 Where fire resistance is required for a system employing gypsum sheathing, details of construction shall be in compliance with listings or reports of tests of systems tested in accordance with
4、ASTM E119 procedures by recognized testing laboratories and shall meet the requirements of the fire rating specified (see Fire Resistance Design Manual, GA-600). 1.3 Where a sound control requirement is specified for a system employing gypsum sheathing, details of construction shall be in compliance
5、 with listings or reports of tests of systems tested in accordance with ASTM E90 or E336 that meet the requirements of the sound control rating specified (see Fire Resistance Design Manual, GA-600). 1.4 Where a racking resistance or wall shear requirement is specified for a system employing gypsum s
6、heathing, details of construction shall be in compliance with reports of tests of systems tested in accordance with ASTM E72 that meet the requirements of the racking or shear value specified by the designer or applicable building code. 2. General Provisions 2.1 Gypsum sheathing shall not be used on
7、 ceilings, soffits or sills unless otherwise recommended by the manufacturer. 2.2 All wood framing members to which gypsum sheathing will be fastened shall be straight and true. Stud spacing shall be not greater than 24 in. (610 mm) o.c. The fastening surface shall be not less than 1 in. (38 mm) wid
8、e and shall not vary more than in. (3 mm) from the plane of the faces of adjacent framing. 2.3 All steel framing members to which gypsum sheathing will be screw attached shall be straight and true, and shall be spaced not greater than 24 in. (610 mm) o.c. They shall be produced from steel of the des
9、ign thickness required and shall be protected with a protective coating to prevent corrosion. The fastening surface to which gypsum sheathing will be attached shall be not less than 1 in. (32 mm) wide. 2.4 Gypsum sheathing used in building construction shall be not less than 8 in. (200 mm) from the
10、finish grade in fully weather and water-protected siding systems, and not less than 12 in. (300 mm) from the ground for properly drained and ventilated crawl spaces. Where ground moisture or humidity is extreme and/or continuous, the grounds surface shall be covered with a vapor retarder. 3. Definit
11、ions and Terms Relating to the Specification 3.1 Gypsum Sheathing a gypsum board, 2 ft (610 mm) or 4 ft (1220 mm) wide, with a water-resistant gypsum core and water repellent surfaces, defined in ASTM Specification C1396/C1396M. 3.1.1 Type X Gypsum Sheathing a gypsum board as described in 3.1 having
12、 special fire resistant properties as defined in ASTM Specification C1396/C1396M. 3.2 Edge paper bound edge, as manufactured. 3.3 End mill-cut or field-cut end perpendicular to edge. At such cuts, the gypsum core is exposed. 3.4 Exterior Cladding a permanent material or system that impedes the trans
13、mission of environmental elements to the sheathing. 3.5 Framing Member that portion of framing, furring, etc., to which gypsum sheathing is attached. 3.6 Fastener nails, screws or staples used for the mechanical application of gypsum sheathing. 3.7 Perpendicular Application an application where gyps
14、um sheathing edges are at right angles to the framing members to which it is attached. 3.8 Parallel Application an application where gypsum sheathing edges are parallel to the framing members to which it is attached. 3.9 Shear Wall a wall designed and constructed to resist lateral wind or seismic lo
15、ads. 3.10 Water-Resistive Barrier a temporarily exposed protective membrane, such as building felt or building paper, that is intended to impede the penetration of environmental elements until the installation of a permanent exterior cladding. GYPSUM ASSOCIATION 6525 BELCREST ROAD, #480 HYATTSVILLE,
16、 MD 20782GA-253-12 Copyright Gypsum Association 2012. All rights reserved. Printed in U.S.A. 4. Materials 4.1 Gypsum Sheathing Standard Specification for Gypsum Board, ASTM C1396/C1396M. 4.2 Fasteners Shall be as described in 4.2.1 through 4.2.4. Fastener length shall be not less than that specified
17、 in Table 1. 4.2.1 Nails Shall be not less than 12 gage, galvanized, roofing nail. 4.2.2 Staples Shall be galvanized steel, not less than 16 gage, 7/16 in. (11 mm) crown, with divergent points. 4.2.3 Screws Shall be corrosion resistant and comply with Standard Specification for Steel Self-Piercing T
18、apping Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs, ASTM C1002. 4.2.3.1 Trim head screws shall not be used for the application of gypsum sheathing. 4.2.3.2 Type W screws are designed for attachment to wood framing. 4.2.3.3 Type S screws are
19、 designed for attachment to light gage steel framing or wood framing. 4.2.4 Screws Shall be corrosion resistant and comply with Standard Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84
20、 mm) in Thickness, ASTM C954. 4.2.4.1 Trim head screws shall not be used for the application of gypsum sheathing. Table 1 Minimum Fastener Lengths for the Attachment of Gypsum Sheathing in. (mm) Sheathing Thickness Wood Framing Steel Framing in. (mm) Nails Staples Screws Screws (12.7) 1 (38) 1 (38)
21、1 (32) 1 (25) (15.9) 1 (44) 1 (41) 1 (41) 1 (32) 4.3 Framing Members 4.3.1 Wood framing members shall conform to American Softwood Lumber Standard, Voluntary Product Standard PS 20. 4.3.2 Steel framing members shall conform to Standard Specification for Nonstructural Steel Framing Members, ASTM C645
22、 (light gage), or Standard Specification for Load-Bearing (Transverse and Axial) Steel Studs, Runners (Tracks), and Bracing or Bridging for Screw Application of Gypsum Panel Products and Metal Plaster Bases, ASTMC 955 (not less than 0.033 in. thick). 4.4 Exterior Cladding(s) Sidings such as, but not
23、 limited to, wood, aluminum, vinyl, plywood, brick, stucco, or Exterior Insulation and Finish Systems. 4.5 Water-Resistive Barrier Shall be as described in 4.5.1 through 4.5.2, or other code-compliant water-resistive barrier. 4.5.1 Building Felt Shall be not less than No. 15 asphalt-saturated felt c
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