ASTM C442/C442M-99a

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: 09-Jun-2001
• 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

• Replaced By: ASTM C442/C442M-01 - Standard Specification for Gypsum Backing Board, Gypsum Coreboard, and Gypsum Shaftliner Board
• Effective Date: 10-Jun-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 442/C 442M – 99a
Standard Specification for
Gypsum Backing Board, Gypsum Coreboard, and Gypsum
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 (e) 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 * E 96 Test Methods for Water Vapor Transmission of Mate-
rials
1.1 This specification covers gypsum board designed to be
E 119 Test Methods for Fire Tests of Building Construction
used as a base in multilayer systems, as a gypsum stud or core
and Materials
in semi-solid or solid gypsum board partitions, or in shaftwall
assemblies.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions—Definitions of terms shall be in accordance
as standard. Within the text, the SI units are shown in brackets.
with Terminology C 11.
The values stated in each system shal be used independent of
3.2 Definitions of Terms Specific to This Standard:
the other. Values from the two systems shall not be combined.
1 5
3.2.1 gypsum backing board, n—a ⁄4 to ⁄8-in. [6.4 to
1.3 The terms “backing board,” “coreboard,” and “shaftliner
15.9-mm] gypsum board used as a backing for gypsum
board,” refer to different end uses of the gypsum board
wallboard, acoustical tile, or other dry cladding.
specified in this specification. The term “gypsum backing
3.2.2 gypsum coreboard, n—a ⁄4 or 1-in. [19.0 to 25.4-mm]
board,” in this specification, shall include gypsum coreboard
gypsum board used as a gypsum stud or core in semisolid or
and gypsum shaftliner board unless otherwise stated.
solid gypsum board partitions.
1.4 The text of this specification references notes and
3.2.3 gypsum shaftliner board, n—a ⁄4 or 1-in. [19.0 or
footnotes which provide explanatory material. These notes and
25.4-mm] gypsum board used in shaftwall assemblies.
footnotes (excluding those in tables and figures) shall not be
considered as requirements of the specification.
4. Materials and Manufacture
4.1 Gypsum backing board shall consist of a noncombus-
2. Referenced Documents
tible core, essentially gypsum, surfaced with paper bonded to
2.1 ASTM Standards:
the core.
C 11 Terminology Relating to Gypsum and Related Build-
4.2 Gypsum coreboard is a single ⁄4-in. [19.0-mm] or 1-in.
ing Materials and Systems
2 [25.4-mm] thick board or is composed of two factory lami-
C 36 Specification for Gypsum Wallboard
nated boards to provide ⁄4-in. [19.0-mm] or 1-in. [25.4-mm]
C 473 Test Methods for Physical Testing of Gypsum Panel
2 total nominal thickness.
Products
4.3 Gypsum shaftliner board is a single ⁄4-in. [19.0-mm] or
C 645 Specification for Non-Load Bearing (Axial) Steel
1-in. [25.4-mm] thick board.
Studs, Runners (Tracks), and Rigid Furring Channels for
2 4.4 Foil-backed gypsum backing board shall consist of
Screw Application of Gypsum Board
gypsum backing board with a layer of aluminum foil laminated
C 1264/C 1264M Specification for Sampling, Inspection,
to the back surface.
Rejection, Certification, Packaging, Marking, Shipping,
2 4.5 Gypsum Backing Board, Type X (Special Fire-
Handling, and Storage of Gypsum Board
Resistant):
E 84 Test Method for Surface Burning Characteristics of
3 4.5.1 Gypsum backing board, type X, designates gypsum
Building Materials
backing board, except gypsum coreboard and gypsum shaft-
liner board, complying with this specification that provides not
less than 1-h fire-resistance for boards ⁄8-in. [15.9-mm] thick
1 3 1
This specification is under the jurisdiction of ASTM Committee C-11 on or ⁄4-h fire-resistance for boards ⁄2-in. [12.7-mm] thick,
Gypsum and Related Building Materials and Systems and is the direct responsibility
applied parallel with and on each side of load bearing 2 by 4
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
wood studs spaced 16-in. [406-mm] on center with 6d coated
Current edition approved Oct. 10, 1999. Published November 1999. Originally
nails, 1 ⁄8-in. [48-mm] long, 0.0915-in. [2.3-mm] diameter
published as C 442 – 59 T. Last previous edition C 442 – 99.
Annual Book of ASTM Standards, Vol 04.01.
Annual Book of ASTM Standards, Vol 04.07.
Annual Book of ASTM Standards, Vol 04.06.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C 442/C 442M
shank, ⁄4-in. [6.4-mm] diameter heads, spaced 7-in [178-mm] 3
⁄4 [19.0] not applicable
1 [25.4] not applicable
on center with gypsum backing board joints staggered 16-in.
[406-mm] on each side of the partition and tested in accordance
5.2.3 Core, End, and Edge Hardness—The specimens shall
with Test Methods E 119.
have an average hardness of not less than 15 lbf [67 N] when
4.5.2 Gypsum shaftliner board, type X, designates gypsum
tested by Method A and 11 lbf [49 N] when tested by Method
shaftliner board complying with this specification that meets
B.
the acceptance criteria for temperature rise for not less than 1 ⁄2
5.2.4 Nail-Pull Resistance—The specimens shall have an
h for boards ⁄4-in. [19.0-mm] thick or 2 h for boards 1-in.
average nail-pull resistance of not less than the following:
[25.4-mm] thick, when applied in a double layer solid nonload
Thickness, in. [mm] Test Method A Test Method B
bearing partition as described in 4.5.2.1 and tested in accor- Nail Pull Resistance, Nail Pull Resistance,
lbf [N] lbf [N]
dance Test Methods E 119 fire endurance exposure with
⁄4 [6.4] 40 [178] 36 [160]
thermocouple locations as specified in 4.5.2.2.
⁄8 [9.5] 60 [267] 56 [249]
⁄2 [12.7] 80 [356] 77 [343]
4.5.2.1 Two layers of gypsum shaftliner board applied
⁄8 [15.9] 90 [400] 87 [387]
vertically and friction fit into vertical 25-gage steel “H”
⁄4 [19] Note 2 Note 2
1 3
members, 1 ⁄2-in. [38.1-mm] deep for boards ⁄4-in. [19.0-mm]
1 [25.4] Note 2 Note 2
thick or 2-in. [50.8-mm] deep for boards 1-in. [25.4-mm] thick,
NOTE 2—Testing is not required for thicknesses greater than ⁄8 in. [15.9
spaced 24-in. [610-mm] on centers and 25-gage steel track at
mm].
the perimeter of the partition. “H” members shall be formed
5.3 Foil-Backed Gypsum Backing Board:
with a single web or shall be two pieces of perimeter track
5.3.1 Foil-backed gypsum backing board shall meet all the
fastened together along the web with screws spaced 25-in.
requirements for gypsum backing board. In addition, aluminum
[610-mm] on centers.
foil shall be bonded to the back surface.
4.5.2.2 Temperature rise on the unexposed surface shall be
5.3.2 When tested in accordance with Test Methods E 96
measured using not less than five thermocouples; one shall be
(Desiccant Method), the permeance of foil-backed gypsum
located at the center of the assembly and one shall be located
backing board shall be not more than 0.30 perm [17 ng/Pa · s
at the center of each quadrant. Thermocouples shall be located
·m ] for the condition of 50 % relative humidity on the face of
not less than 3 in. [76-mm] from an “H” member.
the board and 0 % relative humidity on the foil-covered side of
NOTE 1—Consult gypsum backing board producers for independent test
the board.
data on assembly details and fire resistance classifications for other types
of construction. See official fire test reports for assembly particulars,
6. Dimensio
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