ASTM C956-04(2019)
(Specification)Standard Specification for Installation of Cast-In-Place Reinforced Gypsum Concrete
Standard Specification for Installation of Cast-In-Place Reinforced Gypsum Concrete
ABSTRACT
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.
SCOPE
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.
General Information
Relations
Standards Content (Sample)
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.
Designation:C956 −04 (Reapproved 2019)
Standard Specification for
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Installation of Cast-In-Place Reinforced Gypsum Concrete
This standard is issued under the fixed designation C956; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope C11Terminology Relating to Gypsum and Related Building
Materials and Systems
1.1 This specification covers the minimum requirements for
C317/C317MSpecification for Gypsum Concrete
the installation of cast-in-place reinforced gypsum concrete
C726Specification for Mineral Wool Roof Insulation Board
over permanent formboard.
E72Test Methods of Conducting Strength Tests of Panels
1.2 The values stated in inch-pound units are to be regarded
for Building Construction
as the standard. The values given in parentheses are for
2.2 American Concrete Institute Standard:
information only.
ACI 318Building Code Requirements for Reinforced Con-
1.3 The text of this standard references notes and footnotes 4
crete
which provide explanatory material.These notes and footnotes
2.3 American Welding Society Standard:
(excluding those in tables and figures) shall not be considered
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D1.1Structural Welding Code Steel
requirements of the standard.
1.4 This international standard was developed in accor-
3. Terminology
dance with internationally recognized principles on standard-
3.1 Definitions shall be in accordance with Terminology
ization established in the Decision on Principles for the
C11.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3.2 Definitions:
Barriers to Trade (TBT) Committee.
3.2.1 primary framing, n—structural members provided to
support the reinforced gypsum concrete roof deck assembly.
2. Referenced Documents
3.2.1.1 purlin, n—a secondary structural member that spans
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2.1 ASTM Standards:
the primary framing members and provides support for sub-
A82/A82MSpecification for Steel Wire, Plain, for Concrete
purlins.
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Reinforcement (Withdrawn 2013)
3.2.2 subpurlin, n—a steel member applied transversely to
A185/A185M Specification for Steel Welded Wire
the primary framing and purlins to support the formboards and
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Reinforcement, Plain, for Concrete (Withdrawn 2013)
to transmit the dead and live loads from the gypsum concrete
A568/A568M Specification for Steel, Sheet, Carbon,
slab to the primary framing.
Structural,andHigh-Strength,Low-Alloy,Hot-Rolledand
3.2.2.1 bulb tee, n—a subpurlin, hot-rolled formed steel,
Cold-Rolled, General Requirements for
rail-shaped section.
A653/A653MSpecification for Steel Sheet, Zinc-Coated
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
3.2.2.2 truss tee, n—a subpurlin fabricated from steel wire
by the Hot-Dip Process
and strip, tee-shaped section.
3.2.3 cross tee, n—asteeltee-shapedsectionusedtosupport
a formboard end at right angles to the subpurlins where a
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This specification is under the jurisdiction of ASTM Committee C11 on
formboard end does not occur over the purlin or primary
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
framing.
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther
Products in Assemblies.
3.2.4 formboard, n—sheet material used as a permanent
Current edition approved Oct. 1, 2019. Published October 2019. Originally
form to support the gypsum concrete.
approved in 1981. Last previous edition approved in 2015 as C956–04(2015).
DOI: 10.1520/C0956-04R19.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on AvailablefromAmericanConcreteInstitute(ACI),P.O.Box9094,Farmington
the ASTM website. Hills, MI 48333-9094, http://www.concrete.org.
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The last approved version of this historical standard is referenced on Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
www.astm.org. Miami, FL 33126, http://www.aws.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C956−04 (2019)
3.2.5 reinforcement, n—steel wire mesh or fabric used supported at the perimeter with a frame providing 1 in.
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within the gypsum concrete slab to provide longitudinal and (25.4mm) bearing on ends and ⁄2 in. (12.7 mm) bearing on
transverse strength. edges and 7 in. (177.8 mm) nominal
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