ASTM C840-08
(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 (seeAppendix 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
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 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.
1.7 The following precautionary caveat pertains only to Sections 6-24. 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 app...
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Designation: C840 – 08
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* 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.
1.6 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.
1.7 The following precautionary caveat pertains only to
1.2.1 Where this specification is more stringent (size or
Sections 6-24. This standard does not purport to address all of
thickness of framing: size and spacing of fasteners) than the
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 and health practices and determine the applica-
assembly, details of construction shall be in accordance with
bility of regulatory limitations prior to use.
reports of acoustical tests of assemblies that have met the
1.7.1 For specific precautionary statements, see 4.1.1, 4.1.2,
required acoustical values.
and 22.5.
1.4 Unheated spaces above gypsum board ceilings shall be
properly ventilated (seeAppendix X2).
2. Referenced Documents
1.5 The various application systems are located in the
2
2.1 ASTM Standards:
following sections:
C11 TerminologyRelatingtoGypsumandRelatedBuilding
I Application of Single-Ply Gypsum Board to Wood Framing 8
Materials and Systems
Members
II Application of Two-Ply Gypsum Board to Wood Framing 9
C475/C475M Specification for Joint Compound and Joint
Members
Tape for Finishing Gypsum Board
III Application of Gypsum Board by Adhesive Nail-On to 10
C514 Specification for Nails for theApplication of Gypsum
Wood Framing Members
IV Semi-Solid Gypsum Board Partitions 11
Board
V Solid Gypsum Board Partitions 12
C557 Specification for Adhesives for Fastening Gypsum
VI Application of Gypsum Board with Adhesives to Interior 13
Wallboard to Wood Framing
Masonry or Concrete Walls
VII Application of Gypsum Board to Rigid Foam Insulation 14
C645 Specification for Nonstructural Steel Framing Mem-
VIII Application of Gypsum Board to Steel Framing and Furring 15
bers
IX Arches and Bending Radii 16
C754 Specification for Installation of Steel Framing Mem-
X Application of Gypsum Board to Receive Tile by 17
Adhesive Application
bers to Receive Screw-Attached Gypsum Panel Products
XI Exterior Application of Gypsum Wallboard and 18
C920 Specification for Elastomeric Joint Sealants
Exterior Gypsum Soffit Board
XII Floating Interior Angles 19 C954 Specification for Steel Drill Screws for the Applica-
XIII Control (Expansion) Joints 20
tion of Gypsum Panel Products or Metal Plaster Bases to
XIV Foil-Backed Gypsum Board 21
Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84
mm) in Thickness
C1002 Specification for Steel Self-PiercingTapping Screws
for the Application of Gypsum Panel Products or Metal
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, 2008. Published June 2008. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1979. Last previous edition approved in 2007 as C840 – 07. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0840-08. 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
...
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:C 840–07 Designation: C 840 – 08
Standard Specification for
1
Application and Finishing of Gypsum Board
This standard is issued under the fixed designation C 840; 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 (seeAppendix 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
The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are
approximate and are provided for information purposes only.
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 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.
1.7 The following precautionary caveat pertains only to Sections 6-24. 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.
1.7.1 For specific precautionary statements, see 4.1.1, 4.1.2, and 22.5.
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 Jan.May 1, 2007.2008. Published February 2007.June 2008. Originally approved in 1979. Last previous edition approved in 20062007 as C
840–06.840 – 07.
*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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C 840–08
2. Referenced Documents
2
2.1 ASTM Standards:
C 11Guide for Use ofActivity and Use Limitations, Including Institutional and Engineering Controls Terminology Relating to
Gypsum and Related Building Materials and Systems
C 475/C 475MGuide for Use of Activity and Use Limitations, Including Institutional and Engineering Controls Specification
for Joint Compound and Joint Tape for Finishing Gypsum Board
C 514Guide for Use ofActivity and Use Limitations, Including Institutional and Engineering Controls Specification for Nails
for the Applicati
...
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