Active Standard ASTM C1280 | Developed by Subcommittee: C11.03
Book of Standards Volume: 04.01
Historical (view previous versions of standard)
This specification covers the minimum requirements for and the methods of application of gypsum sheathing for use as a substrate for exterior wall cladding. Gypsum sheathing board is a substrate that shall be covered by an exterior cladding or other weather-resistive barrier and is not intended for long-term exposure. Framing members shall be installed so that the surface will be in an even plane, unless otherwise specified, after the gypsum sheathing has been applied. The gypsum sheathing shall be cut by scoring and breaking or by sawing, working from the face side. The cut edges and ends of gypsum sheathing shall be trimmed to obtain neat fitting joints when installed. Gypsum sheathing shall be fitted snugly around all window and door openings. Control joints, other accessories, and metal plaster base shall be fastened through gypsum sheathing to framing members. Where fire resistance or shear resistance is not required, and when metal lath and Portland cement plaster are to be applied as the exterior cladding over gypsum sheathing installed over framing members and the metal lath shall be installed after the gypsum sheathing, the gypsum sheathing shall be permitted to be applied and fastening of the gypsum sheathing shall be completed with the attachment of the self-furred metal lath.
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1.2 Details of construction for a specific assembly to achieve the required fire resistance shall be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.
1.3 Where sound control is required for a gypsum panel product assembly, the details of construction shall be in accordance with the acoustical test report of an assembly that has met the required acoustical value(s).
1.4 Where resistance to racking loads or shear is required for a gypsum panel product assembly, the details of construction shall be in accordance with the racking or shear test report of an assembly that has met the required racking or shear value(s).
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C954 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 mm) in Thickness
C955 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
C1002 Specification for Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs
C1007 Specification for Installation of Load Bearing (Transverse and Axial) Steel Studs and Related Accessories
C1063 Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
C1177/C1177M Specification for Glass Mat Gypsum Substrate for Use as Sheathing
C1278/C1278M Specification for Fiber-Reinforced Gypsum Panel
C1396/C1396M Specification for Gypsum Board
U.S. Department of Commerce PublicationPS20 American Softwood Lumber Standard Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
ICS Number Code 91.060.10 (Walls. Partitions. Facades); 91.100.10 (Cement. Gypsum. Lime. Mortar)