ASTM C1178/C1178M-99
(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/C1178M – 99
Standard Specification for
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Glass Mat Water-Resistant Gypsum Backing Panel
This standard is issued under the fixed designation C 1178/C1178M; 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 4. Materials and Manufacture
1.1 This specification covers glass mat water-resistant gyp- 4.1 Glass mat water-resistant gypsum backing panel shall
sum backing panel designed for use on ceilings and walls in consist of a noncombustible water-resistant core, essentially
bath and shower areas as a base for the application of ceramic gypsum, surfaced with glass mat, partially or completely
or plastic tile. embedded in the core, and with a water resistant coating on one
1.2 The values stated in either inch-pound units or SI surface.
(metric) are to be regarded separately as standard. Within the 4.2 Glass mat water-resistant gypsum panels, type X (spe-
text, the SI units are shown in brackets. The values stated in cial fire-resistant) designates glass mat gypsum panels comply-
each system shall be used independently of the other. Values ing with this specification that provide not less than 1-h
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from the two systems shall not be combined. fire-resistance for boards ⁄8 in. [15.9 mm] thick or ⁄4-h fire-
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1.3 The text of this standard references notes and footnotes resistance for panels ⁄2 in. [12.7 mm] thick, applied parallel
that provide explanatory material. These notes and footnotes with and on each side of load bearing 2 by 4 wood studs spaced
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(excluding those in tables and figures) shall not be considered 16 in. [406 mm] on center with 6d coated nails, 1 ⁄8 in.
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as requirements of the standard. [48-mm] long, 0.0915 in. [2.3 mm] diameter shank, ⁄4 in. [6.4
mm] diameter heads, spaced 7 in. [178 mm] on center with
2. Referenced Documents
glass mat gypsum panel joints staggered 16 in. [406 mm] on
2.1 ASTM Standards:
each side of the partition and tested in accordance with Test
C 11 Terminology Relating to Gypsum and Related Build- Methods E 119.
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ing Materials and Systems
NOTE 1—Consult manufacturers for independent test data on assembly
C 473 Test Methods for Physical Testing of Gypsum Panel
details and fire resistance classifications for other types of construction.
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Products
See official fire test reports for assembly particulars, materials, and
C 645 Specification for Nonstructural Steel Framing Mem-
classifications.
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bers
5. Physical Properties
C 1264 Specification for Sampling, Inspection, Rejection,
Certification, Packaging, Marking, Shipping, Handling, 5.1 Specimens shall be taken from the samples obtained in
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and Storage of Gypsum Board accordance with Specification C 1264.
E 119 Test Methods for Fire Tests of Building Construction 5.2 Specimens shall be tested in accordance with Test
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and Materials Methods C 473.
5.2.1 Flexural Strength—The specimens shall be tested face
3. Terminology
up and face down. The average breaking load shall not be less
3.1 Definitions shall be in accordance with Terminology
than the following:
C11.
Method B
Load, lbf [N]
3.2 Definitions of Terms Specific to This Standard:
3.2.1 glass mat, n—a mat of glass fibers with or without a
Thickness, Bearing edges perpendicular Bearing edges parallel
binder.
in. [mm] to the board edge to the board edge
3.2.2 edge, n—the bound edge as manufactured.
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⁄4 [6.4] 50 [222] 40 [178]
3.2.3 face, n—the coated surface.
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⁄2 [12.7] 100 [445] 80 [356]
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⁄8 [15.9] 140 [623] 100 [445]
5.2.2 Humidified Deflection—Specimens shall have an av-
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This specification is under the jurisdiction of ASTM Committee C-11 on
erage deflection of not more than the following:
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products. Thickness, Humidified deflection,
Current edition approved October 10, 1999. Published December 1999. Origi- in. [mm] eighths of an in. [mm]
nally published as C 1178 – 91. Last previous edition C 1178 – 96.
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⁄4 [6.4] not applicable
Annual Book of ASTM Standards, Vol 04.01.
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Annual Book of ASTM Standards, Vol 04.07.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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C 1178/C1178M
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1 mm], with a tolerance of ⁄32 in. [3 mm] under the specified
⁄2 [12.7] 2 [6]
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⁄8 [15.9] 1 [3]
width.
6.2.3 Length—The nominal length and tolerance shall be as
5.2.3 Core, End and Edge Hardness—Specimens shall have
follows:
an average hardness of not less than 15 lbf [67 N] when tested
Thickness Length Variation
in accordance with
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