ASTM C79/C79M-03

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 C 1280 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-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 C79/C79M-01 - Standard Specification for Treated Core and Nontreated Core Gypsum Sheathing Board
• Effective Date: 10-Jun-2003
• Replaced By: ASTM C79/C79M-04 - Standard Specification for Treated Core and Nontreated Core Gypsum Sheathing Board
• Effective Date: 01-Jan-2004
• Referred By: ASTM C1535-05(2023) - Standard Practice for Application of Exterior Insulation and Finish Systems Class PI
• 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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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 79/C 79M – 03
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. Materials and Manufacture
1.1 This specification covers treated core and nontreated 4.1 Gypsum sheathing shall consist of a noncombustible
core gypsum sheathing, which is designed to be used as a core, essentially gypsum, surfaced on both the face and the
sheathing on buildings. back with water-repellent paper bonded to the core.
4.1.1 Treated core gypsum sheathing shall have a water-
NOTE 1—Specification C 1280 contains application procedures for
resistant material incorporated into the core.
gypsum sheathing board.
4.1.2 Nontreated core gypsum sheathing shall not be re-
1.2 The values stated in either inch-pound or SI (metric)
quired to have a water-resistant material incorporated in the
units are to be regarded separately as the standard. Within the
core.
text, the SI units are shown in brackets. The values stated in
4.2 Gypsum Sheathing, Type X (Special Fire-Resistant),
each system shall be used independently of the other. Values
designates gypsum sheathing complying with this specification
from the two systems shall not be combined.
5
that provides not less than 1-h fire-resistance for boards ⁄8 in.
3 1
[15.9 mm] thick or ⁄4-h fire-resistance for boards ⁄2 in. [12.7
2. Referenced Documents
mm] thick, applied parallel with and on each side of load
2.1 ASTM Standards:
bearing 2 by 4 wood studs spaced 16 in. [406 mm] on centers
C 11 Terminology Relating to Gypsum and Related Build-
7
with 6d coated nails, 1 ⁄8 in. [48 mm] long, 0.0915-in.
2
ing Materials and Systems
1
[2.3-mm] diameter shank, ⁄4-in. [6.4-mm] diameter heads,
C 473 Test Methods for Physical Testing of Gypsum Panel
spaced 7 in. [178 mm] on center with gypsum sheathing joints
2
Products
staggered 16 in. [406 mm] on each side of the partition and
C 645 Specification for Nonstructural Steel Framing Mem-
tested in accordance with Test Methods E 119.
2
bers
NOTE 2—Consult producers for independent test data on assembly
C 1264 Specification for Sampling, Inspection, Rejection,
details and fire resistance classifications for other types of construction.
Certification, Packaging, Marking, Shipping, Handling,
See fire test reports, or listings from recognized fire testing laboratories,
2
and Storage of Gypsum Board
for assembly particulars, materials, and classifications.
2
C 1280 Specification for Application of Gypsum Sheathing
E 119 Test Methods for Fire Tests of Building Construction
5. Physical Properties
3
and Materials
5.1 Specimens shall be taken from the samples obtained in
accordance with 8.1.
3. Terminology
5.1.1 Specimens shall be tested in accordance with Test
3.1 Definitions used in this specification shall be in accor-
Methods C 473.
dance with Terminology C 11.
5.1.2 Flexural Strength—The specimens shall be tested face
up and face down. The average breaking load shall be not less
1 than the following:
This specification is under the jurisdiction of ASTM Committee C11 on
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved June 10, 2003. Published August 2003. Originally
approved in 1930. Last previous edition approved in 2001 as C 79/C 79M – 01.
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 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 79/C 79M – 03
6. Dimensions and Tolerances
Method A Method A Method B Method B
Bearing Edges Bearing Edges Bearing Edges Bearing Edges
6.1 Specimens shall be taken from the samples obtained in
Perp to Panel Par to Panel Perp to Panel Par to Panel
accordance with 8.1.
Thickness Length Length Length Length
in. [mm] lbf [N] lbf [N] lbf [N] lbf [N]
6.2 Thickness, width, length, and end squareness shall be
determined in accordance with Test Methods C 473.
3
⁄8 [9.5] 80 [356] 30 [133] 77 [343] 26 [116]
3 4
4
6.2.1 Thickness—The nominal thickness shall be ⁄8 , ⁄10 ,
...