ASTM C37/C37M-99

Standard Specification for Gypsum Lath

SCOPE
1.1 This specification covers plain and foil-backed types of gypsum lath which is designed to be used as a base for application of gypsum plaster (see Specification C28).
Note 1--Specification C841 contains application procedures for interior lathing and furring, and Specification C842 contains application procedures for interior gypsum plaster.
1.2 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system shall be used independent 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-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

• Replaced By: ASTM C37/C37M-01 - Standard Specification for Gypsum Lath
• Effective Date: 10-May-2001
• Referred By: ASTM C11-23 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 10-May-2001
• Referred By: ASTM D1779-98(2017) - Standard Specification for Adhesive for Acoustical Materials
• Effective Date: 10-May-2001

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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.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 37/C 37M – 99
Standard Specification for
1
Gypsum Lath
This standard is issued under the fixed designation C 37/C 37M; 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 * core, essentially gypsum, surfaced with paper bonded to the
core.
1.1 This specification covers plain and foil-backed types of
4.2 Foil-backed gypsum lath shall consist of plain gypsum
gypsum lath which is designed to be used as a base for
lath with a layer of aluminum foil laminated to the back
application of gypsum plaster (see Specification C 28).
surface.
1.2 The values stated in either inch-pound or SI (metric)
units are to be regarded separately as standard. Within the text,
NOTE 1—Foil-backed gypsum lath shall be installed with the foil
the SI units are shown in brackets. The values stated in each surface against the framing members. The foil surface is not adapted to
receive or retain plaster.
system shall be used independent of the other. Values from the
two systems shall not be combined.
4.3 Gypsum lath, type X (special fire-resistant) designates
1.3 The text of this standard references notes and footnotes
gypsum lath complying with this specification that provides not
that provide explanatory material. These notes and footnotes 3
less than 1 h fire-resistance for lath ⁄8 in. [9.5 mm] thick,
(excluding those in tables and figures) shall not be considered
applied perpendicular with and on each side of load bearing 2
as requirements of the standard.
3 4 wood studs spaced 16 in. [406 mm] o.c. with blue lath
1
nails, 1 ⁄8 in. [29 mm] long, 0.092 in. [2.3 mm] diameter
2. Referenced Documents
19
shank, ⁄64 in. [7.5 mm] diameter heads, spaced 5 in. [127 mm]
2.1 ASTM Standards:
o.c. with lath joints staggered 16 in. [406 mm] on each side of
C 11 Terminology Relating to Gypsum and Related Build-
1
the partition, over which is applied ⁄2 in. [12.7 mm] of 1:2
2
ing Materials and Systems
gypsum sand plaster, and tested in accordance with the
2
C 28 Specification for Gypsum Plasters
requirements of Test Method E 119.
C 473 Test Methods for Physical Testing of Gypsum Panel
2
NOTE 2—Consult producers for independent test data on assembly
Products
details and fire resistance classifications for other types of construction.
C 1264 Specification for Sampling, Inspection, Rejection,
See official fire test reports for assembly particulars, materials, and
Certification, Packaging, Marking, Shipping, Handling,
classifications.
2
and Storage of Gypsum Board
NOTE 3—The definition of type X as given in 4.3 is intended only as a
E 96 Test Methods for Water Vapor Transmission of Mate-
test to define the gypsum lath as meeting the requirements of type X. This
3
test does not indicate a preferred application nor does it limit the use of the
rials
product in other fire rated assemblies.
E 119 Test Methods for Fire Tests of Building Construction
4
and Materials
5. Physical Properties
3. Terminology 5.1 Specimens shall be taken from the samples obtained in
accordance with Specification C 1264.
3.1 Definitions of terms shall be in accordance with Termi-
5.2 Specimens shall be tested in accordance with Test
nology C 11.
Methods C 473.
4. Materials and Manufacture
5.2.1 Flexural Strength—The specimens shall be tested face
up and face down. The average breaking load shall be not less
4.1 Plain gypsum lath shall consist of a noncombustible
than the following:
Method A Method B
1
Load, lbf [N] Load, lbf [N]
This specification is under the jurisdiction of ASTM Committee C-11 on
Load, lbf [N] Bearing Edges Load, lbf [N] Bearing Edges
Gypsum and Related Building Materials and Systems and is the direct responsibility
Bearing Edges Parallel to Bearing Edges Parallel to
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Thickness, Across Fiber Fiber of Across Fiber Fiber of
Current edition approved Oct. 10, 1999. Published January 2000. Originally
in. [mm] of Surfacing Surfacing of Surfacing Surfacing
published as C 37 – 21 T. Last previous edition C 37 – 95.
2
Annual Book of ASTM Standards, Vol 04.01.
3
⁄8 [9.5] 60 [267] 25 [111] 56 [249] 21 [93]
3
Annual Book of ASTM Standards, Vol 04.06.
1
⁄2 [12.7] 100 [445] 35 [156] 97 [431] 31 [138]
4
Annual Book of ASTM Standards, Vol 04.07.
*A Summary of Changes section appears at the end of this standard.
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C 37/C 37M
5.2.2 Humidified Deflection—The specimens shall
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