ASTM C840-23
(Specification)Standard Specification for Application and Finishing of Gypsum Board
Standard Specification for Application and Finishing of Gypsum Board
ABSTRACT
This specification covers requirements for the methods of application and finishing of gypsum board. Construction details 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. Gypsum board assembly shall conform to acoustical tests of the specification where sound control is required. Moreover, gypsum assembly shall conform to framing size, fasteners spacing, ventilation, substrate, surface preparation, cutting, and installation application as indicated in the specification. Materials categorized under this specification include: gypsum boards, gypsum wallboards, gypsum backing board and coreboard, water-resistant gypsum backing board, exterior gypsum soffit board, and gypsum ceiling board. Finishing materials include: compounds, joint tape, fasteners, nails, screws, and staples. A fire test of assemblies shall be conducted to determine a fire resistance rating required for gypsum board assembly. Gypsum board shall be cut by scoring and breaking or by sawing, working from the face side. Masonry or concrete walls shall be dry, free of dust, oil, or form release agents, protrusions or voids, or foreign matter that inhibit bond for adhesively applied gypsum board. All materials shall be kept dry. Where gypsum board is stored outside, it shall be off the ground, properly supported on a level platform and fully protected from the weather or direct sunlight exposure.
SCOPE
1.1 This specification covers the minimum requirements for the methods of application and finishing of gypsum board, including related items and accessories to interior walls and ceilings and to exterior soffits.
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 Where this specification is more stringent (size or thickness of framing: size and spacing of fasteners) than the fire-rated construction, this specification shall govern.
1.3 Where sound control is required for a gypsum board assembly, details of construction shall be in accordance with reports of acoustical tests of assemblies that have met the required acoustical values.
1.4 Unheated spaces above gypsum board ceilings shall be properly ventilated (see Appendix X2).
1.5 The various application systems are located in the following sections:
I
Application of Single-ply Gypsum Board to Wood Framing Members
8
II
Application of Two-ply Gypsum Board to Wood Framing Members
9
III
Application of Gypsum Board by Adhesive Nail-on to Wood Framing
Members
10
IV
Semi-solid Gypsum Board Partitions
11
V
Solid Gypsum Board Partitions
12
VI
Application of Gypsum Board with Adhesives to Interior Masonry or
Concrete Walls
13
VII
Application of Gypsum Board to Rigid Foam Insulation
14
VIII
Application of Gypsum Board to Steel Framing and Furring
15
IX
Arches and Bending Radii
16
X
Application of Gypsum Board to Receive Tile by Adhesive Application
17
XI
Application of Exterior Gypsum Soffit Board or Other Gypsum Board for Use in Exterior Soffits
18
XII
Floating Interior Angles
19
XIII
Control (Expansion) Joints
20
XIV
Foil-backed Gypsum Board
21
XV
Application of Vinyl Faced Gypsum Board
22
1.6 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.
1.7 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as ...
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C840 − 23
Standard Specification for
1
Application and Finishing of Gypsum Board
This standard is issued under the fixed designation C840; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
XIV Foil-backed Gypsum Board 21
XV Application of Vinyl Faced Gypsum Board 22
1.1 This specification covers the minimum requirements for
1.6 The values stated in inch-pound units are to be regarded
the methods of application and finishing of gypsum board,
as standard. The values given in parentheses are mathematical
including related items and accessories to interior walls and
conversions to SI units that are provided for information only
ceilings and to exterior soffits.
and are not considered standard.
1.2 Details of construction for a specific assembly to
1.7 The text of this specification references notes and
achieve the required fire resistance shall be obtained from
footnotes which provide explanatory material. These notes and
reports of fire-resistance tests, engineering evaluations, or
footnotes (excluding those in tables and figures) shall not be
listings from recognized fire testing laboratories.
considered as requirements of the specification.
1.2.1 Where this specification is more stringent (size or
1.8 The following precautionary caveat pertains only to
thickness of framing: size and spacing of fasteners) than the
fire-rated construction, this specification shall govern. Sections 6 – 26. This standard does not purport to address all
of the safety concerns, if any, associated with its use. It is the
1.3 Where sound control is required for a gypsum board
responsibility of the user of this standard to establish appro-
assembly, details of construction shall be in accordance with
priate safety, health, and environmental practices and deter-
reports of acoustical tests of assemblies that have met the
mine the applicability of regulatory limitations prior to use.
required acoustical values.
For specific precautionary statements, see 4.1.1, 4.1.2, and
1.4 Unheated spaces above gypsum board ceilings shall be
24.5.
properly ventilated (see Appendix X2).
1.9 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.5 The various application systems are located in the
ization established in the Decision on Principles for the
following sections:
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
I Application of Single-ply Gypsum Board to Wood Framing Members 8
II Application of Two-ply Gypsum Board to Wood Framing Members 9
Barriers to Trade (TBT) Committee.
III Application of Gypsum Board by Adhesive Nail-on to Wood Framing 10
Members
2. Referenced Documents
IV Semi-solid Gypsum Board Partitions 11
2
V Solid Gypsum Board Partitions 12
2.1 ASTM Standards:
VI Application of Gypsum Board with Adhesives to Interior Masonry or 13
C11 Terminology Relating to Gypsum and Related Building
Concrete Walls
VII Application of Gypsum Board to Rigid Foam Insulation 14
Materials and Systems
VIII Application of Gypsum Board to Steel Framing and Furring 15
C475/C475M Specification for Joint Compound and Joint
IX Arches and Bending Radii 16
Tape for Finishing Gypsum Board
X Application of Gypsum Board to Receive Tile by Adhesive Application 17
XI Application of Exterior Gypsum Soffit Board or Other Gypsum Board 18 C514 Specification for Nails for the Application of Gypsum
for Use in Exterior Soffits
Board
XII Floating Interior Angles 19
C557 Specification for Adhesives for Fastening Gypsum
XIII Control (Expansion) Joints 20
Wallboard to Wood Framing
C645 Specification for Nonstructural Steel Framing Mem-
bers
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
2
Products in Assemblies. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2023. Published December 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1979. Last previous edition approved in 2020 as C840 – 20. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0840-23. the ASTM web
...
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: C840 − 20 C840 − 23
Standard Specification for
1
Application and Finishing of Gypsum Board
This standard is issued under the fixed designation C840; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers the minimum requirements for the methods of application and finishing of gypsum board, including
related items and accessories.accessories to interior walls and ceilings and to exterior soffits.
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 Where this specification is more stringent (size or thickness of framing: size and spacing of fasteners) than the fire-rated
construction, this specification shall govern.
1.3 Where sound control is required for a gypsum board assembly, details of construction shall be in accordance with reports of
acoustical tests of assemblies that have met the required acoustical values.
1.4 Unheated spaces above gypsum board ceilings shall be properly ventilated (see Appendix X2).
1.5 The various application systems are located in the following sections:
I Application of Single-ply Gypsum Board to Wood Framing Members 8
II Application of Two-ply Gypsum Board to Wood Framing Members 9
III Application of Gypsum Board by Adhesive Nail-on to Wood Framing 10
Members
IV Semi-solid Gypsum Board Partitions 11
V Solid Gypsum Board Partitions 12
VI Application of Gypsum Board with Adhesives to Interior Masonry or 13
Concrete Walls
VII Application of Gypsum Board to Rigid Foam Insulation 14
VIII Application of Gypsum Board to Steel Framing and Furring 15
IX Arches and Bending Radii 16
X Application of Gypsum Board to Receive Tile by Adhesive Application 17
XI Exterior Application of Gypsum Wallboard and Exterior Gypsum Soffit 18
Board
XI Application of Exterior Gypsum Soffit 18
Board or Other Gypsum Board for Use in Exterior Soffits
XII Floating Interior Angles 19
XIII Control (Expansion) Joints 20
XIV Foil-backed Gypsum Board 21
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 May 1, 2020Oct. 1, 2023. Published June 2020December 2023. Originally approved in 1979. Last previous edition approved in 20192020 as
C840 – 19b.C840 – 20. DOI: 10.1520/C0840-20.10.1520/C0840-23.
*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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C840 − 23
XV Application of Vinyl Faced Gypsum Board 22
1.6 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.
1.7 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the specification.
1.8 The following precautionary caveat pertains only to Sections 6 – 26. 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,
health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific
precautionary statements, see 4.1.1, 4.1.2, and 24.5.
1.9 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C475/C475M
...
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