ASTM C1178/C1178M-06

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Designation: C 1178/C 1178M – 06
Standard Specification for
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Coated 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 Definitions of Terms Specific to This Standard:
3.2.1 glass mat, n—a mat of glass fibers with or without a
1.1 This specification covers coated glass mat water-
binder.
resistant gypsum backing panel designed for use on ceilings
3.2.2 edge, n—the bound edge as manufactured.
and walls in bath and shower areas as a base for the application
3.2.3 face, n—the coated surface.
of ceramic or plastic tile.
3.2.4 nominal thickness, n—the manufacturer-stated frac-
1.2 The values stated in either inch-pound units or SI
tional value of thickness of the gypsum panel product ex-
(metric) are to be regarded separately as standard. Within the
pressed in decimal value to the nearest one-thousandth (0.001)
text, the SI units are shown in brackets. The values stated in
of an inch.
each system shall be used independently of the other. Values
from the two systems shall not be combined.
4. Materials and Manufacture
1.3 The text of this standard references notes and footnotes
4.1 Coated glass mat water-resistant gypsum backing pan-
that provide explanatory material. These notes and footnotes
el shall consist of a noncombustible water-resistant core,
(excluding those in tables and figures) shall not be considered
essentially gypsum, surfaced with glass mat, partially or
as requirements of the standard.
completely embedded in the core, and with a water-resistant
2. Referenced Documents coating on one surface.
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4.2 Coated glass mat water-resistant gypsum panels, type X
2.1 ASTM Standards:
(special fire-resistant) designates glass mat gypsum panels
C11 Terminology Relating to Gypsum and Related Build-
complying with this specification that provide not less than 1-h
ing Materials and Systems
5 3
fire resistance rating for boards ⁄8 in. [15.9 mm] thick or ⁄4-h
C 473 Test Methods for Physical Testing of Gypsum Panel
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fire resistance rating for panels ⁄2 in. [12.7 mm] thick, applied
Products
parallel with and on each side of load bearing 2 by 4 wood
C 645 Specification for Nonstructural Steel Framing Mem-
studs spaced 16 in. [406 mm] on center with 6d coated nails,
bers
7 1
1 ⁄8 in. [48-mm] long, 0.0915 in. [2.3 mm] diameter shank, ⁄4
C 1264 Specification for Sampling, Inspection, Rejection,
in. [6.4 mm] diameter heads, spaced 7 in. [178 mm] on center
Certification, Packaging, Marking, Shipping, Handling,
with glass mat gypsum panel joints staggered 16 in. [406 mm]
and Storage of Gypsum Panel Products
on each side of the partition and tested in accordance with Test
E119 Test Methods for Fire Tests of Building Construction
MethodsE119.
and Materials
NOTE 1—Consult manufacturers for independent test data on assembly
3. Terminology
details and fire resistance ratings for other types of construction. See fire
3.1 Definitions shall be in accordance with Terminology test reports or listings from recognized fire testing laboratories for
assembly particulars, materials, and ratings.
C11.
5. Physical Properties
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This specification is under the jurisdiction of ASTM Committee C11 on
5.1 Specimens shall be taken from the samples obtained in
Gypsum and Related Building Materials and Systems and is the direct responsibility
accordance with Specification C 1264.
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
5.2 Specimens shall be tested in accordance with Test
Current edition approved Nov. 1, 2006. Published December 2006. Originally
approved in 1991. Last previous edition approved in 2004 as C 1178/C 1178M –
Methods C 473.
e1
04 .
5.2.1 Flexural Strength—The specimens shall be tested face
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
up and face down. The average breaking load shall not be less
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
than the following:
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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C 1178/C 1178M – 06
6.2 Thickness, width, and length shall be determined in
Method B
Load, lbf [N]
accordance with Test Methods C 473.
1 1 5
6.2.1 Thickness—The thickness shall be ⁄4 in., ⁄2 in. or ⁄8
Thickness, Bearing edges perpendicular
...