ASTM C931/C931M-03

Standard Specification for Exterior Gypsum Soffit Board

SCOPE
1.1 This specification covers exterior gypsum soffit board, designed to be used for exterior soffits and carport ceilings that are completely protected from contact with liquid water.
Note 1—Specification C 840 contains application procedures for exterior gypsum soffit board.
1.2 The values stated in either inch-pound units or SI (metric) are to be regarded separately as the 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.

General Information

• Status: Historical
• Publication Date: 09-Jun-2003
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.01 - Specifications and Test Methods for Gypsum Products

Relations

• Replaces: ASTM C931/C931M-02 - Standard Specification for Exterior Gypsum Soffit Board
• Effective Date: 10-Jun-2003
• Replaced By: ASTM C931/C931M-04 - Standard Specification for Exterior Gypsum Soffit Board
• Effective Date: 01-Jan-2004

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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 931/C 931M – 03
Standard Specification for
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Exterior Gypsum Soffit Board
This standard is issued under the fixed designation C 931/C 931M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* E 119 Test Methods for Fire Tests of Building Construction
3
and Materials
1.1 This specification covers exterior gypsum soffit board,
designed to be used for exterior soffits and carport ceilings that
3. Terminology
are completely protected from contact with liquid water.
3.1 Definitions of terms shall be in accordance with Termi-
NOTE 1—Specification C 840 contains application procedures for exte-
nology C 11.
rior gypsum soffit board.
4. Materials and Manufacture
1.2 The values stated in either inch-pound units or SI
(metric) are to be regarded separately as the standard. Within
4.1 Gypsum soffit board shall consist of a noncombustible
the text, the SI units are shown in brackets. The values stated core, essentially gypsum, surfaced with paper bonded to the
in each system shall be used independently of the other. Values
core.
from the two systems shall not be combined. 4.2 Exterior gypsum soffit board, type X (special fire-
1.3 The text of this standard references notes and footnotes
resistant) designates exterior gypsum soffit board complying
that provide explanatory material. These notes and footnotes with this specification that provides not less than 1-h fire-
5 3
(excluding those in tables and figures) shall not be considered
resistance for boards ⁄8-in. (15.9-mm) thick or ⁄4-h fire-
1
as requirements of the standard. resistance for boards ⁄2-in. (12.7-mm) thick, applied parallel
with and on each side of load bearing 2 by 4 wood studs spaced
2. Referenced Documents
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16 in. (406 mm) on center with 6d coated nails, 1 ⁄8-in.
1
2.1 ASTM Standards:
(48-mm) long, 0.0915-in. (2.3-mm) diameter shank, ⁄4-in.
C 11 Terminology Relating to Gypsum and Related Build-
(6.4-mm) diameter heads, spaced 7 in. (178 mm) on center
2
ing Materials and Systems
with exterior gypsum soffit board joints staggered 16 in. (406
C 473 Test Methods for Physical Testing of Gypsum Panel
mm) on each side of the partition and tested in accordance with
2
Products
Test Methods E 119.
C 645 Specification for Nonstructural Steel Framing Mem-
NOTE 2—Consult producers for independent test data on assembly
2
bers
details and fire-resistance classifications for other types of construction.
C 840 Specification for Application and Finishing of Gyp-
See test reports or listings from recognized fire testing laboratories for
2
sum Board
assembly particulars, materials, and classifications.
C 1264 Specification for Sampling, Inspection, Rejection,
4.3 Gypsum soffit board shall have a flame spread index of
Certification, Packaging, Marking, Shipping, Handling,
not more than 25 when tested in accordance with the require-
2
and Storage of Gypsum Board
ments of Test Method E 84.
E 84 Test Method for Surface Burning Characteristics of
3
Building Materials
5. Physical Properties
5.1 Specimens shall be taken from samples obtained in
accordance with Specification C 1264.
1 5.2 Specimens shall be test in accordance with Test Methods
This specification is under the jurisdiction of ASTM Committee C11 on
C 473.
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
5.2.1 Flexural Strength:
Current edition approved June 10, 2003. Published August 2003. Originally
5.2.1.1 The specimens shall be tested face up and face
approved in 1980. Last previous edition approved in 2002 as C 931/C 931M – 02.
2
down. The average breaking load shall be not less than the
Annual Book of ASTM Standards, Vol 04.01.
3
Annual Book of ASTM Standards, Vol 04.07. following:
*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 931/C 931M – 03
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6.2.1 Thickness—The nominal thickness shall be ⁄2 or ⁄8 in.
Method A Method B
Thickness, Load, lbf (N) Load, lbf (N)
(12.7 or 15.9 mm) with tolerances in the nominal thickness of
in. (mm) Load, lbf (N) Bearing Edges Load, lbf (N) Bearing Edges
1 1
6 ⁄64 in. (0.4 mm) with local variations of 6 ⁄32 in.
...