ASTM C931/C931M-01

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 C840 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-May-2001
• 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-98 - Standard Specification for Exterior Gypsum Soffit Board
• Effective Date: 10-May-2001
• Replaced By: ASTM C931/C931M-02 - Standard Specification for Exterior Gypsum Soffit Board
• Effective Date: 10-Nov-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 931/C 931M – 01
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.
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1. Scope * 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
1.1 This specification covers exterior gypsum soffit board,
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16 in. (406 mm) on center with 6d coated nails, 1 ⁄8-in.
designed to be used for exterior soffits and carport ceilings that
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(48-mm) long, 0.0915-in. (2.3-mm) diameter shank, ⁄4-in.
are completely protected from contact with liquid water.
(6.4-mm) diameter heads, spaced 7 in. (178 mm) on center
NOTE 1—Specification C 840 contains application procedures for exte-
with exterior gypsum soffit board joints staggered 16 in. (406
rior gypsum soffit board.
mm) on each side of the partition and tested in accordance with
1.2 The values stated in either inch-pound units or SI
Test Methods E 119.
(metric) are to be regarded separately as the standard. Within
NOTE 2—Consult producers for independent test data on assembly
the text, the SI units are shown in brackets. The values stated
details and fire-resistance classifications for other types of construction.
in each system shall be used independently of the other. Values
See test reports or listings from recognized fire testing laboratories for
from the two systems shall not be combined.
assembly particulars, materials, and classifications.
3.3 Gypsum soffit board shall have a maximum flame-
2. Referenced Documents
spread classification of 25 when tested in accordance with the
2.1 ASTM Standards:
requirements of Test Method E 84.
C 473 Test Methods for Physical Testing of Gypsum Panel
2
Products
4. Physical Properties
C 645 Specification for Nonstructural Steel Framing Mem-
4.1 Flexural Strength:
2
bers
4.1.1 Specimens shall be tested in accordance with Test
C 840 Specification for Application and Finishing of Gyp-
Methods C 473. When tested face up and when tested face
2
sum Board
down the specimens shall have an average breaking load of not
C 1264 Specification for Sampling, Inspection, Rejection,
less than the following:
Certification, Packaging, Marking, Shipping, Handling,
Method A Method B
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and Storage of Gypsum Board
Thickness, Load, lbf (N) Load, lbf (N)
E 84 Test Method for Surface Burning Characteristics of
in. (mm) Load, lbf (N) Bearing Edges Load, lbf (N) Bearing Edges
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Bearing Edges Parallel to Bearing Edges Parallel to
Building Materials
Across Fiber Fiber of Across Fiber Fiber of
E 119 Test Methods for Fire Tests of Building Construction
of Surfacing Surfacing of Surfacing Surfacing
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and Materials
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⁄2 (12.7) 110 (489) 40 (178) 107 (476) 36 (160)
5
⁄8 (15.9) 150 (668) 50 (222) 147 (654) 46 (205)
3. Materials and Manufacture
4.2 Humidified Deflection:
3.1 Gypsum soffit board shall consist of a noncombustible
4.2.1 When tested in accordance with Test Methods C 473,
core, essentially gypsum, surfaced with paper bonded to the
specimens taken from the gypsum soffit board shall have an
core.
average deflection of no more than the following:
3.2 Exterior gypsum soffit board, type X (special fire-
resistant) designates exterior gypsum soffit board complying Humidified Deflection,
Thickness, in. (mm) Eighths of an in. (mm)
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-
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⁄2 (12.7) 7 (22)
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⁄8 (15.9) 4 (13)
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4.3 Core, End, and Edge Hardness:
This specification is under the jurisdiction of ASTM Committee C11 on
Gypsum and Related Building Materials and Systems and is the direct responsibility
4.3.1 When tested in accordance with Test Methods C 473,
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
specimens taken from the gypsum soffit board shall have an
Current edition approved May 10, 2001. Published July 2001. Originally
average hardness of not less than 15 lbf (67 N) when tested by
published as C 931 – 80. Last previous edition C 931/C 931M – 98.
2
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, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) f
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