ASTM C1178/C1178M-04
(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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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.
1. Scope* 3.2.2 edge, n—the bound edge as manufactured.
3.2.3 face, n—the coated surface.
1.1 This specification covers glass mat water-resistant gyp-
sum backing panel designed for use on ceilings and walls in
4. Materials and Manufacture
bath and shower areas as a base for the application of ceramic
4.1 Glass mat water-resistant gypsum backing panel shall
or plastic tile.
consist of a noncombustible water-resistant core, essentially
1.2 The values stated in either inch-pound units or SI
gypsum, surfaced with glass mat, partially or completely
(metric) are to be regarded separately as standard. Within the
embedded in the core, and with a water resistant coating on one
text, the SI units are shown in brackets. The values stated in
surface.
each system shall be used independently of the other. Values
4.2 Glass mat water-resistant gypsum panels, type X (spe-
from the two systems shall not be combined.
cial fire-resistant) designates glass mat gypsum panels comply-
1.3 The text of this standard references notes and footnotes
ing with this specification that provide not less than 1-h
that provide explanatory material. These notes and footnotes
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fire-resistance for boards ⁄8 in. [15.9 mm] thick or ⁄4-h
(excluding those in tables and figures) shall not be considered
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fire-resistance for panels ⁄2 in. [12.7 mm] thick, applied
as requirements of the standard.
parallel with and on each side of load bearing 2 by 4 wood
2. Referenced Documents studs spaced 16 in. [406 mm] on center with 6d coated nails,
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2
1 ⁄8 in. [48-mm] long, 0.0915 in. [2.3 mm] diameter shank, ⁄4
2.1 ASTM Standards:
in. [6.4 mm] diameter heads, spaced 7 in. [178 mm] on center
C 11 Terminology Relating to Gypsum and Related Build-
with glass mat gypsum panel joints staggered 16 in. [406 mm]
ing Materials and Systems
on each side of the partition and tested in accordance with Test
C 473 Test Methods for Physical Testing of Gypsum Panel
Methods E 119.
Products
C 645 Specification for Nonstructural Steel Framing Mem-
NOTE 1—Consult manufacturers for independent test data on assembly
bers details and fire resistance classifications for other types of construction.
See fire test reports or listings from recognized fire testing laboratories for
C 1264 Specification for Sampling, Inspection, Rejection,
assembly particulars, materials, and classifications.
Certification, Packaging, Marking, Shipping, Handling,
and Storage of Gypsum Board
5. Physical Properties
E 119 Test Methods for Fire Tests of Building Construction
5.1 Specimens shall be taken from the samples obtained in
and Materials
accordance with Specification C 1264.
3. Terminology 5.2 Specimens shall be tested in accordance with Test
Methods C 473.
3.1 Definitions shall be in accordance with Terminology
5.2.1 Flexural Strength—The specimens shall be tested face
C11.
up and face down. The average breaking load shall not be less
3.2 Definitions of Terms Specific to This Standard:
than the following:
3.2.1 glass mat, n—a mat of glass fibers with or without a
Method B
binder.
Load, lbf [N]
Thickness, Bearing edges perpendicular Bearing edges parallel
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This specification is under the jurisdiction of ASTM Committee C11 on
in. [mm] to the board edge to the board edge
Gypsum and Related Building Materials and Systems and is the direct responsibility
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of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products. ⁄4 [6.4] 50 [222] 40 [178]
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Current edition approved Jan. 1, 2004. Published January 2004. Originally ⁄2 [12.7] 100 [445] 80 [356]
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⁄8 [15.9] 140 [623] 100 [445]
approved in 1991. Last previous edition approved in 2001 as C 1178/C 1178M – 01.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2.2 Humidified Deflection—Specimens shall have an av-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on erage deflection of not more than the following:
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
6.2.2 Width—The nominal width shall be up to 48 in. [1220
Thickness, Humidified deflection,
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in. [mm] eighths of an in. [m
...
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