ASTM C840 - 20
Standard Specification for Application and Finishing of Gypsum Board
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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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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 |
| 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 |
| 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 |
| 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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 the Application 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 Cold-Formed Steel Structural Framing Members
C1002 Specification for Steel Self-Piercing Tapping Screws for 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
C1047 Specification for Accessories for Gypsum Wallboard and Gypsum Veneer Base
C1396/C1396M Specification for Gypsum Board
C1546 Guide for Installation of Gypsum Products in Concealed Radiant Ceiling Heating Systems
E2634 Specification for Flat Wall Insulating Concrete Form (ICF) Systems
U.S. Department of Commerce Publication
PS20 American Softwood Lumber Standard Available from U.S. Government Printing Office, Superintendent of Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http://www.access.gpo.gov.ICS Code
ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)
UNSPSC Code
UNSPSC Code 30161509(Gypsum board)
Referencing This Standard
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DOI: 10.1520/C0840-20
Citation Format
ASTM C840-20, Standard Specification for Application and Finishing of Gypsum Board, ASTM International, West Conshohocken, PA, 2020, www.astm.org
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