ASTM C840-20
(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.
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
Exterior Application of Gypsum Wallboard and Exterior Gypsum Soffit
Board
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 requirements of the specification.
1.8 The following precautionary ca...
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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 −20
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* 1.6 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
1.1 This specification covers the minimum requirements for
conversions to SI units that are provided for information only
the methods of application and finishing of gypsum board,
and are not considered standard.
including related items and accessories.
1.7 The text of this specification references notes and
1.2 Details of construction for a specific assembly to
footnotes which provide explanatory material. These notes and
achieve the required fire resistance shall be obtained from
footnotes (excluding those in tables and figures) shall not be
reports of fire-resistance tests, engineering evaluations, or
considered as requirements of the specification.
listings from recognized fire testing laboratories.
1.8 The following precautionary caveat pertains only to
1.2.1 Where this specification is more stringent (size or
Sections6–26. This standard does not purport to address all
thickness of framing: size and spacing of fasteners) than the
of the safety concerns, if any, associated with its use. It is the
fire-rated construction, this specification shall govern.
responsibility of the user of this standard to establish appro-
1.3 Where sound control is required for a gypsum board
priate safety, health, and environmental practices and deter-
assembly, details of construction shall be in accordance with
mine the applicability of regulatory limitations prior to use.For
reports of acoustical tests of assemblies that have met the
specific precautionary statements, see 4.1.1, 4.1.2, and 24.5.
required acoustical values.
1.9 This international standard was developed in accor-
1.4 Unheated spaces above gypsum board ceilings shall be
dance with internationally recognized principles on standard-
properly ventilated (see Appendix X2).
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.5 The various application systems are located in the
mendations issued by the World Trade Organization Technical
following sections:
Barriers to Trade (TBT) Committee.
I Application of Single-ply Gypsum Board to Wood Framing Members 8
2. Referenced Documents
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
2
2.1 ASTM Standards:
Members
IV Semi-solid Gypsum Board Partitions 11 C11 Terminology Relating to Gypsum and Related Building
V Solid Gypsum Board Partitions 12
Materials and Systems
VI Application of Gypsum Board with Adhesives to Interior Masonry or 13
C475/C475M Specification for Joint Compound and Joint
Concrete Walls
VII Application of Gypsum Board to Rigid Foam Insulation 14 Tape for Finishing Gypsum Board
VIII Application of Gypsum Board to Steel Framing and Furring 15
C514 Specification for Nails for the Application of Gypsum
IX Arches and Bending Radii 16
Board
X Application of Gypsum Board to Receive Tile by Adhesive Application 17
XI Exterior Application of Gypsum Wallboard and Exterior Gypsum Soffit 18
C557 Specification for Adhesives for Fastening Gypsum
Board
Wallboard to Wood Framing
XII Floating Interior Angles 19
C645 Specification for Nonstructural Steel Framing Mem-
XIII Control (Expansion) Joints 20
XIV Foil-backed Gypsum Board 21
bers
XV Application of Vinyl Faced Gypsum Board 22
C754 Specification for Installation of Steel Framing Mem-
bers to Receive Screw-Attached Gypsum Panel Products
C920 Specification for Elastomeric Joint Sealants
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 May 1, 2020. Published June 2020. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1979. Last previous edition approved in 2019 as C840 – 19b. DOI: Standards volume information, refer to the sta
...
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 − 19b C840 − 20
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.
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
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 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.
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 Nov. 1, 2019May 1, 2020. Published November 2019June 2020. Originally approved in 1979. Last previous edition approved in 2019 as
C840 – 19a.C840 – 19b. DOI: 10.1520/C0840-19B.10.1520/C0840-20.
*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 − 20
2. Referenced Documents
2
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C475/C475M Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
C514 Specification for Nails for the Application of Gypsum Board
C557 Specification for Adhesive
...
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