ASTM C1177/C1177M-24

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1177/C1177M − 24
Standard Specification for
1
Glass Mat Gypsum Substrate for Use as Sheathing
This standard is issued under the fixed designation C1177/C1177M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* and Storage of Gypsum Panel Products
D3273 Test Method for Resistance to Growth of Mold on the
1.1 This specification covers glass mat gypsum substrate,
Surface of Interior Coatings in an Environmental Cham-
which is designed to be used as an exterior substrate for a
ber
weather barrier.
E119 Test Methods for Fire Tests of Building Construction
1.2 The values stated in either SI units or inch-pound units
and Materials
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
3. Terminology
system may not be exact equivalents; therefore, each system
3.1 Definitions shall be in accordance with Terminology
shall be used independently of the other. Combining values
C11.
from the two systems may result in non-conformance with the
3.2 Definitions of Terms Specific to This Standard:
standard.
3.2.1 weather barrier, n—a material that prevents the pas-
1.3 The text of this standard references notes and footnotes
sage of rain, sleet and snow.
that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered
4. Materials and Manufacture
as requirements of the standard.
4.1 Glass Mat Gypsum Substrate shall consist of a noncom-
1.4 This international standard was developed in accor-
bustible water-resistant core, essentially gypsum complying
dance with internationally recognized principles on standard-
with Specification C22, surfaced with glass mat partially, or
ization established in the Decision on Principles for the
completely embedded in the core.
Development of International Standards, Guides and Recom-
4.2 Glass Mat Gypsum Substrate, type X (special fire-
mendations issued by the World Trade Organization Technical
resistant) designates glass mat gypsum substrate complying
Barriers to Trade (TBT) Committee.
with this specification that provide not less than 1-h fire
5 3
resistance rating for substrate ⁄8 in. [15.9 mm] thick or ⁄4-h
2. Referenced Documents
1
fire resistance rating for substrate ⁄2 in. [12.7 mm] thick,
2
2.1 ASTM Standards:
applied parallel with and on each side of load bearing 2 by 4
C11 Terminology Relating to Gypsum and Related Building
wood studs spaced 16 in. [406 mm] on center with 6d coated
Materials and Systems
7
nails, 1 ⁄8 in. [48 mm] long, 0.0915 in. [2.3 mm] diameter
C22 Specification for Gypsum
1
shank, ⁄4 in. [6.4 mm] diameter heads, spaced 7 in. [178 mm]
C473 Test Methods for Physical Testing of Gypsum Panel
on center with glass mat gypsum substrate joints staggered
Products
16 in. [406 mm] on each side of the partition and tested in
C645 Specification for Nonstructural Steel Framing Mem-
accordance with Test Methods E119.
bers
NOTE 1—Consult manufacturers for independent test data on assembly
C1264 Specification for Sampling, Inspection, Rejection,
details and fire resistance ratings for other types of construction. See fire
Certification, Packaging, Marking, Shipping, Handling,
test reports or listings from recognized fire testing laboratories for
assembly particulars, materials, and ratings.
1
4.3 Glass mat gypsum substrate, mold resistant, designates
This specification is under the jurisdiction of ASTM Committee C11 on
Gypsum and Related Building Materials and Systems and is the direct responsibility
gypsum panels having not more than 20 % mold growth, based
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
on surface area coverage, when tested in accordance with Test
Current edition approved April 1, 2024. Published April 2024. Originally
Method D3273.
approved in 1991. Last previous edition approved in 2017 as C1177/C1177M – 17.
DOI: 10.1520/C1177_C1177M-24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5. Physical Properties
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 Specimens shall be taken from the samples obtained in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. accordance with Specification C1264.
*A Summary of Changes section appears at the end of this standard
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