ASTM C442/C442M-04

Standard Specification for Gypsum Backing Board, Gypsum Coreboard, and Gypsum Shaftliner Board

SCOPE
1.1 This specification covers gypsum board designed to be used as a base in multilayer systems, as a gypsum stud or core in semi-solid or solid gypsum board partitions, or in shaftwall assemblies.
Note 1—Specification C840 contains application procedures for gypsum backing board, gypsum coreboard, and gypsum shaftliner board.
1.2 The values stated in inch-pound units are to be regarded as standard. Within the text, the SI units are shown in brackets. The values stated in each system shal be used independent of the other. Values from the two systems shall not be combined.
1.3 The terms "backing board," "coreboard," and "shaftliner board," refer to different end uses of the gypsum board specified in this specification. The term "gypsum backing board," in this specification, shall include gypsum coreboard and gypsum shaftliner board unless otherwise stated.
1.4 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.

General Information

• Status: Historical
• Publication Date: 31-Dec-2003
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.01 - Specifications and Test Methods for Gypsum Products

Relations

• Replaces: ASTM C442/C442M-01 - Standard Specification for Gypsum Backing Board, Gypsum Coreboard, and Gypsum Shaftliner Board
• Effective Date: 01-Jan-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: C 442/C 442M – 04
Standard Specification for
Gypsum Backing Board, Gypsum Coreboard, and Gypsum
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Shaftliner Board
This standard is issued under the fixed designation C 442/C 442M; 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* C 1264 Specification for Sampling, Inspection, Rejection,
Certification, Packaging, Marking, Shipping, Handling,
1.1 This specification covers gypsum board designed to be
and Storage of Gypsum Board
used as a base in multilayer systems, as a gypsum stud or core
E84 Test Method for Surface Burning Characteristics of
in semi-solid or solid gypsum board partitions, or in shaftwall
Building Materials
assemblies.
E96 Test Methods for Water Vapor Transmission of Mate-
NOTE 1—Specification C 840C 840 contains application procedures for
rials
gypsum backing board, gypsum coreboard, and gypsum shaftliner board.
E119 Test Methods for Fire Tests of Building Construction
1.2 The values stated in inch-pound units are to be regarded
and Materials
as standard. Within the text, the SI units are shown in brackets.
3. Terminology
The values stated in each system shall be used independent of
the other. Values from the two systems shall not be combined.
3.1 Definitions—Definitions of terms shall be in accordance
1.3 Theterms“backingboard,”“coreboard,”and“shaftliner
with Terminology C 11C11.
board,” refer to different end uses of the gypsum board
3.2 Definitions of Terms Specific to This Standard:
1 5
specified in this specification. The term “gypsum backing
3.2.1 gypsum backing board, n—a ⁄4 to ⁄8-in. [6.4 to
board,” in this specification, shall include gypsum coreboard
15.9-mm] gypsum board used as a backing for gypsum
and gypsum shaftliner board unless otherwise stated.
wallboard, acoustical tile, or other dry cladding.
3
1.4 The text of this specification references notes and
3.2.2 gypsum coreboard, n—a ⁄4 or 1-in. [19.0 to 25.4-mm]
footnotes which provide explanatory material. These notes and
gypsum board used as a gypsum stud or core in semisolid or
footnotes (excluding those in tables and figures) shall not be
solid gypsum board partitions.
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considered as requirements of the specification.
3.2.3 gypsum shaftliner board, n—a ⁄4 or 1-in. [19.0 or
25.4-mm] gypsum board used in shaftwall assemblies.
2. Referenced Documents
2
4. Materials and Manufacture
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Build-
4.1 Gypsum backing board shall consist of a noncombus-
ing Materials and Systems
tible core, essentially gypsum, surfaced with paper bonded to
C 473 Test Methods for Physical Testing of Gypsum Panel
the core.
3
Products
4.2 Gypsum coreboard is a single ⁄4-in. [19.0-mm] or 1-in.
C 645 Specification for Nonstructural Steel Framing Mem-
[25.4-mm] thick board or is composed of two factory lami-
3
bers
nated boards to provide ⁄4-in. [19.0-mm] or 1-in. [25.4-mm]
C 840 Specification for Application and Finishing of Gyp-
total nominal thickness.
3
sum Board
4.3 Gypsum shaftliner board is a single ⁄4-in. [19.0-mm] or
1-in. [25.4-mm] thick board.
4.4 Foil-backed gypsum backing board shall consist of
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This specification is under the jurisdiction of ASTM Committee C11 on
gypsum backing board with a layer of aluminum foil laminated
Gypsum and Related Building Materials and Systems and is the direct responsibility
to the back surface.
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
4.5 Gypsum Backing Board, Type X (Special Fire-
Current edition approved Jan. 1, 2004. Published January 2004. Originally
approved in 1959. Last previous edition approved in 2001 as C 442 – 01.
Resistant):
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.5.1 Gypsum backing board, type X, designates gypsum
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
backing board, except gypsum coreboard and gypsum shaft-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. liner board, complying with this specification that provides not
*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.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
C 442/C 442M – 04
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less than 1-h fire-resistance for boar
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