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The ASTM C840-20 Standard Specification for Application and Finishing of Gypsum Board covers the minimum requirements for the methods of application and finishing of gypsum board, including related items and accessories.

This standard is widely used in the construction industry from the design/architectural community, general contractors and drywall subcontractors performing the work. Most non-residential and public buildings apply these standards as well as Multi-Family and Single-Family building construction.

ASTM standards need to be repurchased when a newer version comes out (which is typically about every 3-4 years). This commonly used standard will likely be updated by the first half of 2024.

ASTM C840-20 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.

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ASTM International is a globally-recognized leader in the development and delivery of voluntary consensus standards. Founded in 1898, the organization’s more than 12,000 standards are used worldwide to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. FCA International participates as an active member on several technical committees and multiple sub-committees and workgroups to represent signatory contractors’ interests.