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ASTM C956-24

Current Revision

Standard Specification for Installation of Cast-In-Place Reinforced Gypsum Concrete

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1.1 This specification covers the minimum requirements for the installation of cast-in-place reinforced gypsum concrete over permanent formboard.

1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered requirements of the standard.

1.4 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.


This specification covers the minimum requirements for the installation of cast-in-place reinforced gypsum concrete over permanent formboard. Subpurlins shall be designed to support live and dead loads of the roof deck. Got-rolled and cold-rolled steel shapes other than bulb trees or truss tees shall meet the requirements of this specification. Mineral fiber formborad shall be tested in accordance with the transverse loading test. Hexagonal reinforcing mesh, rectangular reinforcing fabric, gypsum concrete, and expansion filler strip shall be fabricated in accordance to the specification. The subpurlins shall be placed transversely to the purlins and primary framing and shall be spaced to suit the size of the formboards. Cross tees shall be provided where formboard ends are supported by purlins or the primary framing. Formboards shall be located face down on the flanges of the supporting members and with the ends on top of the purlins. The mesh of wire fabric shall be located with the main longitudinal wires at right angles to the subpurlins and adjacent to the formboard at midspan between the purlins. Expansion filler strips shall be placed continuously against the walls, curbs, nailers, or other rigid surfaces that gypsum concrete will abut. Gypsum concrete mixing and placement shall be performed. Mixing shall be thorough but not overmixed.


SDO ASTM: ASTM International
Document Number C956
Publication Date May 1, 2024
Language en - English
Page Count 7
Revision Level 24
Supercedes
Committee C11.03
Publish Date Document Id Type View
May 1, 2024 C0956-24 Revision
May 1, 2004 C0956-04 Revision
Jan. 1, 1997 C0956-97 Revision
Oct. 1, 2019 C0956-04R19 Reaffirmation
Oct. 1, 2015 C0956-04R15 Reaffirmation
May 15, 2010 C0956-04R10 Reaffirmation
April 10, 1997 C0956-97R02E01 Reaffirmation