ASTM C1178/C1178M-04e1
(Specification)Standard Specification for Glass Mat Water-Resistant Gypsum Backing Panel
Standard Specification for Glass Mat Water-Resistant Gypsum Backing Panel
SCOPE
1.1 This specification covers glass mat water-resistant gypsum backing panel designed for use on ceilings and walls in bath and shower areas as a base for the application of ceramic or plastic tile.
1.2 The values stated in either inch-pound units or SI (metric) are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system shall be used independently of the other. Values from the two systems shall not be combined.
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
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Standards Content (Sample)
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Designation: C 1178/C 1178M – 04
Standard Specification for
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Glass Mat Water-Resistant Gypsum Backing Panel
This standard is issued under the fixed designation C 1178/C 1178M; 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.
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e NOTE—The word rating(s) was added to the term fire resistance throughout editorially October 2004.
1. Scope* 3.2.1 glass mat, n—a mat of glass fibers with or without a
binder.
1.1 This specification covers glass mat water-resistant gyp-
3.2.2 edge, n—the bound edge as manufactured.
sum backing panel designed for use on ceilings and walls in
3.2.3 face, n—the coated surface.
bath and shower areas as a base for the application of ceramic
or plastic tile.
4. Materials and Manufacture
1.2 The values stated in either inch-pound units or SI
4.1 Glass mat water-resistant gypsum backing panel shall
(metric) are to be regarded separately as standard. Within the
consist of a noncombustible water-resistant core, essentially
text, the SI units are shown in brackets. The values stated in
gypsum, surfaced with glass mat, partially or completely
each system shall be used independently of the other. Values
embeddedinthecore,andwithawater-resistantcoatingonone
from the two systems shall not be combined.
surface.
1.3 The text of this standard references notes and footnotes
4.2 Glass mat water-resistant gypsum panels, type X (spe-
that provide explanatory material. These notes and footnotes
cial fire-resistant) designates glass mat gypsum panels comply-
(excluding those in tables and figures) shall not be considered
ing with this specification that provide not less than 1-h fire
as requirements of the standard.
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resistance rating for boards ⁄8 in. [15.9 mm] thick or ⁄4-h fire
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2. Referenced Documents resistance rating for panels ⁄2 in. [12.7 mm] thick, applied
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parallel with and on each side of load bearing 2 by 4 wood
2.1 ASTM Standards:
studs spaced 16 in. [406 mm] on center with 6d coated nails,
C 11 Terminology Relating to Gypsum and Related Build-
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1 ⁄8 in. [48-mm] long, 0.0915 in. [2.3 mm] diameter shank, ⁄4
ing Materials and Systems
in. [6.4 mm] diameter heads, spaced 7 in. [178 mm] on center
C 473 Test Methods for Physical Testing of Gypsum Panel
with glass mat gypsum panel joints staggered 16 in. [406 mm]
Products
on each side of the partition and tested in accordance with Test
C 645 Specification for Nonstructural Steel Framing Mem-
Methods E 119.
bers
C 1264 Specification for Sampling, Inspection, Rejection,
NOTE 1—Consult manufacturers for independent test data on assembly
Certification, Packaging, Marking, Shipping, Handling, details and fire resistance ratings for other types of construction. See fire
test reports or listings from recognized fire testing laboratories for
and Storage of Gypsum Board
assembly particulars, materials, and ratings.
E 119 Test Methods for Fire Tests of Building Construction
and Materials
5. Physical Properties
3. Terminology 5.1 Specimens shall be taken from the samples obtained in
accordance with Specification C 1264.
3.1 Definitions shall be in accordance with Terminology
5.2 Specimens shall be tested in accordance with Test
C11.
Methods C 473.
3.2 Definitions of Terms Specific to This Standard:
5.2.1 Flexural Strength—The specimens shall be tested face
up and face down. The average breaking load shall not be less
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This specification is under the jurisdiction of ASTM Committee C11 on
than the following:
Gypsum and Related Building Materials and Systems and is the direct responsibility
Method B
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Load, lbf [N]
Current edition approved Jan. 1, 2004. Published January 2004. Originally
approved in 1991. Last previous edition approved in 2001 as C 1178/C 1178M – 01.
Thickness, Bearing edges perpendicular Bearing edges parallel
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
in. [mm] to the board edge to the board edge
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
⁄4 [6.4] 50 [222] 40 [178]
the ASTM website.
*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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C 1178/C 1178M – 04
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6.2.1 Thickness—The nominal thickness shall be ⁄4 in., ⁄2
⁄2 [12.7] 100 [445] 80 [356]
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⁄8 [15.9] 140 [623] 100 [445]
in. or ⁄8 in. [6.4, 12.7 or 15.9 mm], with tolerances in the
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