ASTM C931/C931M-02

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.

General Information

• Status: Historical
• Publication Date: 09-Nov-2002
• 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-01 - Standard Specification for Exterior Gypsum Soffit Board
• Effective Date: 10-Nov-2002
• Replaced By: ASTM C931/C931M-03 - Standard Specification for Exterior Gypsum Soffit Board
• Effective Date: 10-Jun-2003

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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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 – 02
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 * with this specification that provides not less than 1-h fire-
5 3
resistance for boards ⁄8-in. (15.9-mm) thick or ⁄4-h fire-
1.1 This specification covers exterior gypsum soffit board,
1
resistance for boards ⁄2-in. (12.7-mm) thick, applied parallel
designed to be used for exterior soffits and carport ceilings that
with and on each side of load bearing 2 by 4 wood studs spaced
are completely protected from contact with liquid water.
7
16 in. (406 mm) on center with 6d coated nails, 1 ⁄8-in.
NOTE 1—Specification C 840 contains application procedures for exte-
1
(48-mm) long, 0.0915-in. (2.3-mm) diameter shank, ⁄4-in.
rior gypsum soffit board.
(6.4-mm) diameter heads, spaced 7 in. (178 mm) on center
1.2 The values stated in either inch-pound units or SI
with exterior gypsum soffit board joints staggered 16 in. (406
(metric) are to be regarded separately as the standard. Within
mm) on each side of the partition and tested in accordance with
the text, the SI units are shown in brackets. The values stated
Test Methods E 119.
in each system shall be used independently of the other. Values
NOTE 2—Consult producers for independent test data on assembly
from the two systems shall not be combined.
details and fire-resistance classifications for other types of construction.
See test reports or listings from recognized fire testing laboratories for
2. Referenced Documents
assembly particulars, materials, and classifications.
2.1 ASTM Standards:
3.3 Gypsum soffit board shall have a maximum flame-
C 473 Test Methods for Physical Testing of Gypsum Panel
spread classification of 25 when tested in accordance with the
2
Products
requirements of Test Method E 84.
C 645 Specification for Nonstructural Steel Framing Mem-
2
bers
4. Physical Properties
C 840 Specification for Application and Finishing of Gyp-
4.1 Flexural Strength:
2
sum Board
4.1.1 Specimens shall be tested in accordance with Test
C 1264 Specification for Sampling, Inspection, Rejection,
Methods C 473. When tested face up and when tested face
Certification, Packaging, Marking, Shipping, Handling,
down the specimens shall have an average breaking load of not
2
and Storage of Gypsum Board
less than the following:
E 84 Test Method for Surface Burning Characteristics of
Method A Method B
3
Building Materials
Thickness, Load, lbf (N) Load, lbf (N)
E 119 Test Methods for Fire Tests of Building Construction
in. (mm) Load, lbf (N) Bearing Edges Load, lbf (N) Bearing Edges
3
Bearing Edges Parallel to Bearing Edges Parallel to
and Materials
Across Fiber Fiber of Across Fiber Fiber of
of Surfacing Surfacing of Surfacing Surfacing
3. Materials and Manufacture
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⁄2 (12.7) 110 (489) 40 (178) 107 (476) 36 (160)
3.1 Gypsum soffit board shall consist of a noncombustible
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⁄8 (15.9) 150 (668) 50 (222) 147 (654) 46 (205)
core, essentially gypsum, surfaced with paper bonded to the
4.2 Humidified Deflection:
core.
4.2.1 When tested in accordance with Test Methods C 473,
3.2 Exterior gypsum soffit board, type X (special fire-
specimens taken from the gypsum soffit board shall have an
resistant) designates exterior gypsum soffit board complying
average deflection of no more than the following:
Humidified Deflection,
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This specification is under the jurisdiction of ASTM Committee C11 on
Thickness, in. (mm) Eighths of an in. (mm)
Gypsum and Related Building Materials and Systems and is the direct responsibility
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of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products. ⁄2 (12.7) 7 (22)
5
⁄8 (15.9) 4 (13)
Current edition approved Nov. 10, 2002. Published November 2002. Originally
published as C 931 – 80. Last previous edition C 931/C 931M – 01.
2 4.3 Core, End, and Edge Hardness:
Annual Book of ASTM Standards, Vol 04.01.
3
Annual Book of ASTM Standards, Vol 04.07. 4.3.1 When tested in accordance with Test Methods C 473,
*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 – 02
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specimens taken from the gypsum soffit b
...