ASTM C1280-07
(Specification)Standard Specification for Application of Gypsum Sheathing
Standard Specification for Application of Gypsum Sheathing
ABSTRACT
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.
SCOPE
1.1 This specification covers the minimum requirements for and methods of application of gypsum sheathing for use as a substrate for exterior wall cladding.
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.
1.2.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners) than the fire-rated construction.
1.3 Where sound control is required for a gypsum sheathing 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).
1.3.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners) than the sound-rated construction.
1.4 Where resistance to racking loads or shear is required for a gypsum sheathing 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).
1.4.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners) than the racking or shear-tested construction.
1.5 The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are approximate and are provided for information purposes only.
1.6 The text of this standard references footnotes which provide explanatory material. These footnotes shall not be considered as requirements of the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C 1280 – 07
Standard Specification for
1
Application of Gypsum Sheathing
This standard is issued under the fixed designation C 1280; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
1.1 This specification covers the minimum requirements for 2.1 ASTM Standards:
and methods of application of gypsum sheathing for use as a C11 Terminology Relating to Gypsum and Related Build-
substrate for exterior wall cladding. ing Materials and Systems
1.2 Details of construction for a specific assembly to C 954 Specification for Steel Drill Screws for the Applica-
achieve the required fire resistance shall be obtained from tion of Gypsum Panel Products or Metal Plaster Bases to
reports of fire-resistance tests, engineering evaluations, or Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84
listings from recognized fire testing laboratories. mm) in Thickness
1.2.1 This specification shall govern where it is more C 955 Specification for Load-Bearing (Transverse and
stringent (size or thickness of framing and size and spacing of Axial) Steel Studs, Runners (Tracks), and Bracing or
fasteners) than the fire-rated construction. Bridging for ScrewApplication of Gypsum Panel Products
1.3 Where sound control is required for a gypsum sheathing and Metal Plaster Bases
assembly, the details of construction shall be in accordance C 1002 Specification for Steel Self-Piercing Tapping
with the acoustical test report of an assembly that has met the Screws for the Application of Gypsum Panel Products or
required acoustical value(s). Metal Plaster Bases to Wood Studs or Steel Studs
1.3.1 This specification shall govern where it is more C 1007 Specification for Installation of Load Bearing
stringent (size or thickness of framing and size and spacing of (Transverse and Axial) Steel Studs and Related Accesso-
fasteners) than the sound-rated construction. ries
1.4 Where resistance to racking loads or shear is required C 1063 Specification for Installation of Lathing and Furring
for a gypsum sheathing assembly, the details of construction to Receive Interior and Exterior Portland Cement-Based
shall be in accordance with the racking or shear test report of Plaster
anassemblythathasmettherequiredrackingorshearvalue(s). C 1396/C 1396M Specification for Gypsum Board
1.4.1 This specification shall govern where it is more 2.2 U.S. Department of Commerce Publication:
3
stringent (size or thickness of framing and size and spacing of PS20 American Softwood Lumber Standard
fasteners) than the racking or shear-tested construction.
3. Terminology
1.5 The values stated in inch-pound units are to be regarded
as the standard.The SI (metric) values given in parentheses are 3.1 Definitions: Definitions shall be in accordance with
TerminologyC11.
approximate and are provided for information purposes only.
1.6 The text of this standard references footnotes which 3.2 Definitions of Terms Specific to This Standard:
3.2.1 exterior cladding, n—a permanent material or system
provide explanatory material. These footnotes shall not be
considered as requirements of the standard. that impedes the transmission of environmental elements to the
sheathing.
1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 3.2.2 fastener, n—nails, staples, or screws used for applica-
tion of the sheathing.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 3.2.3 framing member, n—studs, headers, bracing, and
blocking that serve to receive the sheathing.
bility of regulatory limitations prior to use.
1 2
This specification is under the jurisdiction of ASTM Committee C11 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Gypsum and Related Building Materials and Systems and is the direct responsibility contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther Standards volume information, refer to the standard’s Document Summary page on
Products in Assemblies. the ASTM website.
3
Current edition approved Nov. 1, 2007. Published December 2007. Originally Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
approved in 1994. Last previous edition approved in 2004 as C 1280 - 04. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1942
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C 1280–04 Designation: C 1280 – 07
Standard Specification for
1
Application of Gypsum Sheathing
This standard is issued under the fixed designation C 1280; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers the minimum requirements for and methods of application of gypsum sheathing for use as a
substrate for exterior wall cladding.
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.
1.2.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners)
than the fire-rated construction.
1.3 Where sound control is required for a gypsum sheathing 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).
1.3.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners)
than the sound-rated construction.
1.4 Where resistance to racking loads or shear is required for a gypsum sheathing 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).
1.4.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners)
than the racking or shear-tested construction.
1.5 The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are
approximate and are provided for information purposes only.
1.6 The text of this standard references footnotes which provide explanatory material. These footnotes shall not be considered
as requirements of the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C 11 Terminology Relating to Gypsum and Related Building Materials and Systems C79/C79M Specification for Gypsum
Sheathing Board
C 954 Specification for Steel Drill Screws for theApplication 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
C 955 Specification for Load-Bearing (Transverse andAxial) Steel Studs, Runners (Tracks), and Bracing or Bridging for Screw
Application of Gypsum Panel Products and Metal Plaster Bases
C 1002 Specification for Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or Metal Plaster
Bases to Wood Studs or Steel Studs
C 1007 Specification for the Installation of Load Bearing (Transverse and Axial) Steel Studs and Related Accessories
C 1063 Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
C 1396/C 1396M Specification for Gypsum Board
2.2 U.S. Department of Commerce Publication:
3
PS20 American Softwood Lumber Standard
1
This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.03 on Specifications for the Application of Gypsum and Other Products in Assemblies.
Current edition approved MayNov. 1, 2004.2007. Published June 2004.December 2007. Originally approved in 1994. Last previous edition approved in 19992004 as
C1280-99.C 1280 - 04.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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