ASTM C1177/C1177M-99

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: C 1177/C 1177M – 99
Standard Specification for
Glass Mat Gypsum Substrate for Use as Sheathing
This standard is issued under the fixed designation C 1177/C 1177M; 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 gypsum substrate, 4.1 Glass Mat Gypsum Substrate shall consist of a noncom-
which is designed to be used as an exterior substrate for a bustible water-resistant core, essentially gypsum, surfaced with
weather barrier. glass mat partially, or completely embedded in the core.
1.2 The values stated in either inch-pound units or SI 4.2 Glass Mat Gypsum Substrate, type X (special fire-
(metric) are to be regarded separately as standard. Within the resistant) designates glass mat gypsum substrate complying
text, the SI units are shown in brackets. The values stated in with this specification that provide not less than1hfire
5 3
each system shall be used independently of the other. Values resistance for substrate ⁄8 in. [15.9 mm] thick or ⁄4 h fire
from the two systems shall not be combined. resistance for substrate ⁄2 in. [12.7 mm] thick, applied parallel
1.3 The text of this standard references notes and footnotes with and on each side of load bearing 2 by 4 wood studs spaced
that provide explanatory material. These notes and footnotes 16 in. [406 mm] on center with 6d coated nails, 1 ⁄8 in. [48
(excluding those in tables and figures) shall not be considered mm] long, 0.0915 in. [2.3 mm] diameter shank, ⁄4 in. [6.4 mm]
as requirements of the standard. diameter heads, spaced 7 in. [178 mm] on center with glass mat
gypsum substrate joints staggered 16 in. [406 mm] on each side
2. Referenced Documents
of the partition and tested in accordance with Test Methods
2.1 ASTM Standards: E 119.
C 11 Terminology Relating to Gypsum and Related Build-
NOTE 1—Consult manufacturers for independent test data on assembly
ing Materials and Systems
details and fire resistance classifications for other types of construction.
C 473 Test Methods for Physical Testing of Gypsum Board
See official fire test reports for assembly particulars, materials, and
Panel Products
classifications.
C 645 Specification for Nonstructural Steel Framing Mem-
5. Physical Properties
bers
C 1264 Specification for Sampling, Inspection, Rejection, 5.1 Specimens shall be taken from the samples obtained in
Certification, Packaging, Marking, Shipping, Handling, accordance with Specification C 1264.
and Storage of Gypsum Board. 5.2 Specimens shall be tested in accordance with Methods
E 119 Test Methods for Fire Tests of Building Construction C 473.
and Materials 5.2.1 Flexural Strength—The specimens shall be tested face
up and face down. The average breaking load shall not be less
3. Terminology
than the following:
3.1 Definitions shall be in accordance with Terminology
Method B
C11.
Load, lbf [N] Bearing Load, lbf [N] Bearing edges
3.2 Definitions of Terms Specific to This Standard:
Thickness, edges perpendicular to parallel to the substrate
3.2.1 glass mat, n—a mat of glass fibers with or without a
in. [mm] the substrate edge edge
binder.
⁄4 [6.4] 50 [222] 40 [178]
3.2.2 edge, n—the bound edge as manufactured.
⁄2 [12.7] 100 [445] 80 [356]
3.2.3 weather barrier, n—a material that prevents the pas-
⁄8 [15.9] 140 [623] 100 [445]
sage of rain, sleet and snow.
5.2.2 Humidified Deflection—Specimens shall have an av-
erage deflection of not more than the following:
Thickness, Humidified deflection,
This specification is under the jurisdiction of ASTM Committee C-11 on
in. [mm] eighths of an in. [mm]
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
⁄4 [6.4] not applicable
Current edition approved Oct. 10, 1999. Published December 1999. Originally
⁄2 [12.7] 2 [6]
published as C 1177 – 91. Last previous edition C 1177 – 96. ⁄8 [15.9] 1 [3]
Annual Book of ASTM Standards, Vol 04.01.
5.2.3 Core, End and Edge Hardness—Specimens shall have
Annual Book of ASTM Standards, Vol 04.07.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C 1177/C 1177M
an average hardness of not less than 15 lbf [67 N] when tested
Thickness, Length Variation
in. [mm] ft [mm] in. [mm]
in accordance with Method B:
5.2.4 Nail-Pull Resistance—Specimens shall have an aver-
1 1
⁄4 [6.4] 4 to 8 [1220 to 2440] + ⁄4[6]
1 1
age nail-pull resistance of not less than the following when
⁄2 [12.7] 6 to 12 [1840 to 3660] 6 ⁄4 [6]
5 1
⁄8 [15.9] 6 to 12 [1840 to 3660] 6 ⁄4 [6]
tested in accordance with Method B:
Thickness, Nail pull resistance,
6.2.4 End Squareness—Corners shall be square with a
in. [mm] lbf [N]
tolerance of 61.8 in. [63 mm] in the full width of the
substrate.
⁄4 [6.4] 40 [178]
⁄2 [12.7] 80 [356]
6.2.5 Edges and Ends—The edges and ends shall be straight
⁄8 [15.9] 90 [400]
and either square, recessed, beveled, featured, tapered, or
...