ASTM C1280-12a

Standard Specification for Application of Exterior Gypsum Panel Products for Use as 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 exterior gypsum panel products that are specifically designed for use as a substrate for exterior cladding.
1.1.1 This specification does not cover gypsum panel products that are specifically designed for interior applications.
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 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).
1.3.1 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 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).
1.4.1 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 notes which provide explanatory material. These notes 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.

General Information

• Status: Historical
• Publication Date: 14-Jul-2012
• ICS: 91.060.10 - Walls. Partitions. Facades
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.03 - Specifications for the Application of Gypsum and Other Products in Assemblies

Relations

• Replaces: ASTM C1280-12 - Standard Specification for Application of Gypsum Sheathing
• Effective Date: 15-Jul-2012
• Replaced By: ASTM C1280-13 - Standard Specification for Application of Exterior Gypsum Panel Products for Use as Sheathing
• Effective Date: 15-Feb-2013
• Referred By: ASTM C1397-13(2019) - Standard Practice for Application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage
• Effective Date: 15-Jul-2012
• Referred By: ASTM C1535-05(2023) - Standard Practice for Application of Exterior Insulation and Finish Systems Class PI
• Effective Date: 15-Jul-2012
• Referred By: ASTM C1396/C1396M-17 - Standard Specification for Gypsum Board
• Effective Date: 15-Jul-2012
• Referred By: ASTM C1063-23 - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 15-Jul-2012

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C1280 −12a
StandardSpecification for
Application of Exterior Gypsum Panel Products for Use as
1
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* 1.6 The text of this standard references notes which provide
explanatory material. These notes shall not be considered as
1.1 This specification covers the minimum requirements for
requirements of the standard.
and methods of application of exterior gypsum panel products
that are specifically designed for use as a substrate for exterior
1.7 This standard does not purport to address all of the
cladding.
safety concerns, if any, associated with its use. It is the
1.1.1 This specification does not cover gypsum panel prod-
responsibility of the user of this standard to establish appro-
ucts that are specifically designed for interior applications.
priate safety and health practices and determine the applica-
1.2 Details of construction for a specific assembly to
bility of regulatory limitations prior to use.
achieve the required fire resistance shall be obtained from
reports of fire-resistance tests, engineering evaluations, or
2. Referenced Documents
listings from recognized fire testing laboratories.
2
2.1 ASTM Standards:
1.2.1 This specification shall govern where it is more
C11 Terminology Relating to Gypsum and Related Building
stringent (size or thickness of framing and size and spacing of
Materials and Systems
fasteners) than the fire-rated construction.
C954 SpecificationforSteelDrillScrewsfortheApplication
1.3 Where sound control is required for a gypsum panel
of Gypsum Panel Products or Metal Plaster Bases to Steel
product assembly, the details of construction shall be in
Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in
accordance with the acoustical test report of an assembly that
Thickness
has met the required acoustical value(s).
C955 Specification for Load-Bearing (Transverse andAxial)
1.3.1 This specification shall govern where it is more
Steel Studs, Runners (Tracks), and Bracing or Bridging
stringent (size or thickness of framing and size and spacing of
for Screw Application of Gypsum Panel Products and
fasteners) than the sound-rated construction.
Metal Plaster Bases
1.4 Where resistance to racking loads or shear is required
C1002 Specification for Steel Self-Piercing Tapping Screws
for a gypsum panel product assembly, the details of construc-
for the Application of Gypsum Panel Products or Metal
tion shall be in accordance with the racking or shear test report
Plaster Bases to Wood Studs or Steel Studs
of an assembly that has met the required racking or shear
C1007 Specification for Installation of Load Bearing (Trans-
value(s).
verse and Axial) Steel Studs and Related Accessories
1.4.1 This specification shall govern where it is more
C1063 Specification for Installation of Lathing and Furring
stringent (size or thickness of framing and size and spacing of
to Receive Interior and Exterior Portland Cement-Based
fasteners) than the racking or shear-tested construction.
Plaster
1.5 The values stated in inch-pound units are to be regarded
C1177/C1177M Specification for Glass Mat Gypsum Sub-
as standard. The values given in parentheses are mathematical
strate for Use as Sheathing
conversions to SI units that are provided for information only
C1278/C1278M Specification for Fiber-Reinforced Gypsum
and are not considered standard.
Panel
C1396/C1396M Specification for Gypsum Board
1
This specification is under the jurisdiction of ASTM Committee C11 on
Gypsum and Related Building Materials and Systems and is the direct responsibility
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther
2
Products in Assemblies. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved July 15, 2012. Published September 2012. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1994. Last previous edition approved in 2011 as C1280 – 11. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1280-12A. the ASTM website.
*A Summary 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
1

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C1280−12a
2.2 U.S. Department of Commerce Publication:
3
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3
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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:C1280–12 Designation: C1280 – 12a
Standard Specification for
Application of Gypsum SheathingApplication of Exterior
1
Gypsum Panel Products for Use as 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*
1.1This specification covers the minimum requirements for and methods of application of gypsum sheathing for use as a
substrate for exterior wall cladding.
1.1 This specification covers the minimum requirements for and methods of application of exterior gypsum panel products that
are specifically designed for use as a substrate for exterior cladding.
1.1.1 This specification does not cover gypsum panel products that are specifically designed for interior applications.
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 sheathingpanel 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).
1.3.1 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 sheathingpanel 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).
1.4.1 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 footnotesnotes which provide explanatory material. These footnotesnotes 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 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
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
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 approvedApril 1,July 15, 2012. Published MaySeptember 2012. Originally approved in 1994. Last previous edition approved in 2011 as C1280 – 11. DOI:
10.1520/C1280-12A.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM Internatio
...