ASTM C840-11
(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
Members9 III Application of Gypsum Board by Adhesive Nail-On to
Wood Framing Members10 IV Semi-Solid Gypsum Board Partitions11 V Solid Gypsum Board Partitions12 VI Application of Gypsum Board with Adhesives to Interior
Masonry or Concrete Walls13 VII Application of Gypsum Board to Rigid Foam Insulation14 VIII Application of Gypsum Board to Steel Framing and Furring15 IX Arches and Bending Radii16 X Application of Gypsum Board to Receive Tile by
Adhesive Application 17 XI Exterior Application of Gypsum Wallboard and
Exterior Gypsum Soffit Board18 XII Floating Interior Angles19 XIII Control (Expansion) Joints20 XIV Foil-Backed Gypsum Board21 XVApplication of Vinyl Faced Gypsum Board22
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 6-25. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibili...
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Designation:C840 −11
StandardSpecification 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 Department of Defense.
1. Scope*
XI Exterior Application of Gypsum Wallboard and 18
Exterior Gypsum Soffit Board
1.1 This specification covers the minimum requirements for
XII Floating Interior Angles 19
the methods of application and finishing of gypsum board, XIII Control (Expansion) Joints 20
XIV Foil-Backed Gypsum Board 21
including related items and accessories.
XV Application of Vinyl Faced Gypsum Board 22
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
1.6 The values stated in inch-pound units are to be regarded
listings from recognized fire testing laboratories.
as standard. The values given in parentheses are mathematical
1.2.1 Where this specification is more stringent (size or
conversions to SI units that are provided for information only
thickness of framing: size and spacing of fasteners) than the
and are not considered standard.
fire-rated construction, this specification shall govern.
1.7 The text of this specification references notes and
1.3 Where sound control is required for a gypsum board
footnotes which provide explanatory material. These notes and
assembly, details of construction shall be in accordance with
footnotes (excluding those in tables and figures) shall not be
reports of acoustical tests of assemblies that have met the
considered as requirements of the specification.
required acoustical values.
1.8 The following precautionary caveat pertains only to
1.4 Unheated spaces above gypsum board ceilings shall be
Sections 6-25. This standard does not purport to address all of
properly ventilated (see Appendix X2).
the safety concerns, if any, associated with its use. It is the
1.5 The various application systems are located in the
responsibility of the user of this standard to establish appro-
following sections:
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
I Application of Single-Ply Gypsum Board to Wood 8
1.8.1 For specific precautionary statements, see 4.1.1, 4.1.2,
Framing
and 23.5.
Members
II Application of Two-Ply Gypsum Board to Wood 9
Framing
2. Referenced Documents
Members
2
III Application of Gypsum Board by Adhesive Nail-On to 10 2.1 ASTM Standards:
Wood Framing Members
C11 Terminology Relating to Gypsum and Related Building
IV Semi-Solid Gypsum Board Partitions 11
Materials and Systems
V Solid Gypsum Board Partitions 12
VI Application of Gypsum Board with Adhesives to Interior 13 C475/C475M Specification for Joint Compound and Joint
Masonry or Concrete Walls
Tape for Finishing Gypsum Board
VII Application of Gypsum Board to Rigid Foam Insulation 14
C514 Specification for Nails for the Application of Gypsum
VIII Application of Gypsum Board to Steel Framing and 15
Furring Board
IX Arches and Bending Radii 16
C557 Specification for Adhesives for Fastening Gypsum
X Application of Gypsum Board to Receive Tile by 17
Wallboard to Wood Framing
Adhesive Application
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
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther
2
Products in Assemblies. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2011. Published January 2012. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1979. Last previous edition approved in 2008 as C840 – 08. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0840-11. 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
---------------------- Page: 1 ----------------------
C840−11
C754 Specification for Installation of Steel Framing Mem-
bers to Receive Screw-Attached Gypsum Panel Products
C920 Specification for Elastomeric Joint Sealants
1
---------------------- Page: 2 ----------------------
C840−11
C954 SpecificationforSteelDrillScrewsfortheApplication 3.2.9 finishing,n—thepreparationofgypsumboardsurfaces
of
...
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:C840–08 Designation: C840 – 11
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 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 8
Members
II Application of Two-Ply Gypsum Board to Wood Framing 9
Members
III Application of Gypsum Board by Adhesive Nail-On to 10
Wood Framing Members
IV Semi-Solid Gypsum Board Partitions 11
V Solid Gypsum Board Partitions 12
VI Application of Gypsum Board with Adhesives to Interior 13
Masonry or 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 17
Adhesive Application
XI Exterior Application of Gypsum Wallboard and 18
Exterior Gypsum Soffit 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.
1.6The1.7 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.
1.7The1.8 The following precautionary caveat pertains only to Sections 6-246-25. 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.
1.7.1For1.8.1 For specific precautionary statements, see 4.1.1, 4.1.2, and 22.523.5.
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 MayDec. 1, 2008.2011. Published June 2008.January 2012. Originally approved in 1979. Last previous edition approved in 20072008 as
C840 – 078. DOI: 10.1520/C0840-08.10.1520/C0840-11.
*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
---------------------- Page: 1 ----------------------
C840 – 11
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 Adhesives for Fastening Gypsum Wallboard to Wood Framing
C645 Specification for Nonstructural Steel Framing Members
C754 Specification for Installation of Steel Framing Members to Receive Screw-Attached Gypsum Panel Products
C920 Specification for Elastomeric Joint Sealants
C954 Specification for Steel Drill Screws for th
...
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