ASTM C1280-11
(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 standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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: C1280 – 11
Standard Specification for
1
Application of Gypsum Sheathing
This standard is issued under the fixed designation C1280; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
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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 TerminologyRelatingtoGypsumandRelatedBuilding
substrate for exterior wall cladding. Materials and Systems
1.2 Details of construction for a specific assembly to C954 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 C955 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 C1002 Specification for Steel Self-PiercingTapping Screws
with the acoustical test report of an assembly that has met the for the Application of Gypsum Panel Products or Metal
required acoustical value(s). Plaster Bases to Wood Studs or Steel Studs
1.3.1 This specification shall govern where it is more C1007 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 C1063 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). C1396/C1396M Specification for Gypsum Board
1.4.1 This specification shall govern where it is more 2.2 U.S. Department of Commerce Publication:
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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 standard. The values given in parentheses are mathematical 3.1 Definitions: Definitions shall be in accordance with
Terminology C11.
conversions to SI units that are provided for information only
and are not considered standard. 3.2 Definitions of Terms Specific to This Standard:
3.2.1 exterior cladding, n—a permanent material or system
1.6 The text of this standard references footnotes which
provide explanatory material. These footnotes shall not be that impedes the transmission of environmental elements to the
sheathing.
considered as requirements of the standard.
1.7 This standard does not purport to address all of the 3.2.2 fastener, n—nails, staples, or screws used for applica-
tion of the sheathing.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.2.3 framing member, n—studs, headers, bracing, and
blocking that serve to receive the sheathing.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 3.2.4 horizontal application, n—a synonym for perpendicu-
lar application.
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This specification is under the jurisdiction of ASTM Committee C11 on
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Gypsum and Related Building Materials and Systems and is the direct responsibility For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Products in Assemblies. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 1, 2011. Published January 2012. Originally the ASTM website.
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approved in 1994. Last previous edition approved in 2009 as C1280 – 09. DOI: Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
10.1520/C1280-11. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*ASummary of Changes section appears at
...
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:C1280–09 Designation: C1280 – 11
Standard Specification for
1
Application of Gypsum Sheathing
This standard is issued under the fixed designation C1280; 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 (´) 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 standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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:
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 andAxial) 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
C1396/C1396M Specification for Gypsum Board
2.2 U.S. Department of Commerce Publication:
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PS20 American Softwood Lumber Standard
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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 MayDec. 1, 2009.2011. Published May 2009.January 2012. Originally approved in 1994. Last previous edition approved in 20072009 as
C1280 – 079. DOI: 10.1520/C1280-09.10.1520/C1280-11.
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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