ASTM C79/C79M-01

Standard Specification for Treated Core and Nontreated Core Gypsum Sheathing Board

SCOPE
1.1 This specification covers treated core and nontreated core gypsum sheathing, which is designed to be used as a sheathing on buildings.
Note 1--Specification C1280 contains application procedures for gypsum sheathing board.
1.2 The values stated in either inch-pound or SI (metric) units 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 C79/C79M-00 - Standard Specification for Treated Core and Nontreated Core Gypsum Sheathing Board
• Effective Date: 10-May-2001
• Replaced By: ASTM C79/C79M-03 - Standard Specification for Treated Core and Nontreated Core Gypsum Sheathing Board
• Effective Date: 10-Jun-2003
• Referred By: ASTM C1535-05(2023) - Standard Practice for Application of Exterior Insulation and Finish Systems Class PI
• Effective Date: 10-May-2001

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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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 79/C 79M – 01
Standard Specification for
Treated Core and Nontreated Core Gypsum Sheathing
1
Board
This standard is issued under the fixed designation C 79/C 79M; 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 * 4.1.1 Treated core gypsum sheathing shall have a water-
resistant material incorporated into the core.
1.1 This specification covers treated core and nontreated
4.1.2 Nontreated core gypsum sheathing shall not be re-
core gypsum sheathing, which is designed to be used as a
quired to have a water-resistant material incorporated in the
sheathing on buildings.
core.
NOTE 1—Specification C 1280 contains application procedures for
4.2 Gypsum Sheathing, Type X (Special Fire-Resistant),
gypsum sheathing board.
designates gypsum sheathing complying with this specification
5
1.2 The values stated in either inch-pound or SI (metric)
that provides not less than 1-h fire-resistance for boards ⁄8 in.
3 1
units are to be regarded separately as the standard. Within the
[15.9 mm] thick or ⁄4-h fire-resistance for boards ⁄2 in. [12.7
text, the SI units are shown in brackets. The values stated in
mm] thick, applied parallel with and on each side of load
each system shall be used independently of the other. Values
bearing 2 by 4 wood studs spaced 16 in. [406 mm] on centers
7
from the two systems shall not be combined.
with 6d coated nails, 1 ⁄8in. [48 mm] long, 0.0915-in. [2.3-mm]
1
diameter shank, ⁄4-in. [6.4-mm] diameter heads, spaced 7 in.
2. Referenced Documents
[178 mm] on center with gypsum sheathing joints staggered 16
2.1 ASTM Standards:
in. [406 mm] on each side of the partition and tested in
C 11 Terminology Relating to Gypsum and Related Build-
accordance with Test Methods E 119.
2
ing Materials and Systems
NOTE 2—Consult producers for independent test data on assembly
C 473 Test Methods for Physical Testing of Gypsum Panel
details and fire resistance classifications for other types of construction.
2
Products
See fire test reports, or listings from recognized fire testing laboratories,
C 645 Specification for Nonstructural Steel Framing Mem-
for assembly particulars, materials, and classifications.
2
bers
5. Physical Properties
C 1264 Specification for Sampling, Inspection, Rejection,
Certification, Packaging, Marking, Shipping, Handling,
5.1 Specimens shall be taken from the samples obtained in
2
and Storage of Gypsum Board
accordance with 8.1.
2
C 1280 Specification for Application of Gypsum Sheathing
5.1.1 Specimens shall be tested in accordance with Test
E 119 Test Methods for Fire Tests of Building Construction
Methods C 473.
3
and Materials
5.1.2 Flexural Strength—The specimens shall be tested face
up and face down. The average breaking load shall be not less
3. Terminology
than the following:
3.1 Definitions used in this specification shall be in accor-
Method A Method A Method B Method B
dance with Terminology C 11. Bearing Edges Bearing Edges Bearing Edges Bearing Edges
Perp to Panel Par to Panel Perp to Panel Par to Panel
Thickness Length Length Length Length
4. Materials and Manufacture
in. [mm] lbf [N] lbf [N] lbf [N] lbf [N]
4.1 Gypsum sheathing shall consist of a noncombustible
3
⁄8 [9.5] 80 [356] 30 [133] 77 [343] 26 [116]
core, essentially gypsum, surfaced on both the face and the
4
⁄10 [10.2] 88 [391] 32 [142] 85 [378] 28 [125]
back with water-repellent paper bonded to the core.
1
⁄2 [12.7] 110 [489] 40 [178] 107 [476] 36 [160]
5
⁄8 [15.9] 150 [667] 50 [222] 147 [654] 46 [205]
1
This specification is under the jurisdiction of ASTM Committee C11 on
5.1.3 Humidified Deflection—The specimens shall have an
Gypsum and Related Building Materials and Systems and is the direct responsibility
average deflection of not more than the following:
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Thickness Deflection
Current edition approved May 10, 2001. Published July 2001. Originally
in. [mm] eighths of an inch [mm]
published as C 79 – 30 T. Last previous edition C 79/C 79M – 00.
2
Annual Book of ASTM Standards, Vol 04.01.
3
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 superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C 79/C 79M
5
3
or ⁄8 in. [9.5,
...