ASTM C1178/C1178M-01

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 1178/C 1178M – 01
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 * 3.2.3 face, n—the coated surface.
1.1 This specification covers glass mat water-resistant gyp-
4. Materials and Manufacture
sum backing panel designed for use on ceilings and walls in
4.1 Glass mat water-resistant gypsum backing panel shall
bath and shower areas as a base for the application of ceramic
consist of a noncombustible water-resistant core, essentially
or plastic tile.
gypsum, surfaced with glass mat, partially or completely
1.2 The values stated in either inch-pound units or SI
embedded in the core, and with a water resistant coating on one
(metric) are to be regarded separately as standard. Within the
surface.
text, the SI units are shown in brackets. The values stated in
4.2 Glass mat water-resistant gypsum panels, type X (spe-
each system shall be used independently of the other. Values
cial fire-resistant) designates glass mat gypsum panels comply-
from the two systems shall not be combined.
ing with this specification that provide not less than 1-h
1.3 The text of this standard references notes and footnotes
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fire-resistance for boards ⁄8 in. [15.9 mm] thick or ⁄4-h fire-
that provide explanatory material. These notes and footnotes
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resistance for panels ⁄2 in. [12.7 mm] thick, applied parallel
(excluding those in tables and figures) shall not be considered
with and on each side of load bearing 2 by 4 wood studs spaced
as requirements of the standard.
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16 in. [406 mm] on center with 6d coated nails, 1 ⁄8 in.
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2. Referenced Documents [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
2.1 ASTM Standards:
glass mat gypsum panel joints staggered 16 in. [406 mm] on
C 11 Terminology Relating to Gypsum and Related Build-
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each side of the partition and tested in accordance with Test
ing Materials and Systems
Methods E 119.
C 473 Test Methods for Physical Testing of Gypsum Panel
2
Products
NOTE 1—Consult manufacturers for independent test data on assembly
C 645 Specification for Nonstructural Steel Framing Mem-
details and fire resistance classifications for other types of construction.
2
See fire test reports or listings from recognized fire testing laboratories for
bers
assembly particulars, materials, and classifications.
C 1264 Specification for Sampling, Inspection, Rejection,
Certification, Packaging, Marking, Shipping, Handling,
5. Physical Properties
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and Storage of Gypsum Board
5.1 Specimens shall be taken from the samples obtained in
E 119 Test Methods for Fire Tests of Building Construction
3 accordance with Specification C 1264.
and Materials
5.2 Specimens shall be tested in accordance with Test
3. Terminology Methods C 473.
5.2.1 Flexural Strength—The specimens shall be tested face
3.1 Definitions shall be in accordance with Terminology
up and face down. The average breaking load shall not be less
C11.
than the following:
3.2 Definitions of Terms Specific to This Standard:
Method B
3.2.1 glass mat, n—a mat of glass fibers with or without a
Load, lbf [N]
binder.
3.2.2 edge, n—the bound edge as manufactured. Thickness, Bearing edges perpendicular Bearing edges parallel
in. [mm] to the board edge to the board edge
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⁄4 [6.4] 50 [222] 40 [178]
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This specification is under the jurisdiction of ASTM Committee C11 on
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⁄2 [12.7] 100 [445] 80 [356]
Gypsum and Related Building Materials and Systems and is the direct responsibility
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⁄8 [15.9] 140 [623] 100 [445]
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved May 10, 2001. Published August 2001. Originally
5.2.2 Humidified Deflection—Specimens shall have an av-
published as C 1178 – 91. Last previous edition C 1178/C 1178M – 99.
erage deflection of not more than the following:
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Annual Book of ASTM Standards, Vol 04.01.
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Annual Book of ASTM Standards, Vol 04.07.
*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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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C 1178/C 1178M
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 a
...