ASTM C847-09
(Specification)Standard Specification for Metal Lath
Standard Specification for Metal Lath
ABSTRACT
This specification covers sheet lath, expanded metal lath, diamond mesh, flat and self-furring, and rib metal lath, all with or without backing and designed to be used as a base for gypsum or Portland cement plaster. Metal lath shall be fabricated from cold-rolled carbon steel sheet of commercial quality as specified and galvanized metal lath shall have a G60 coating. Physical properties such as thickness, width, length, and weight shall be specified. Metal lath shall be fabricated from hot-dipped galvanized steel.
SCOPE
1.1 This specification covers sheet lath, expanded metal lath, diamond mesh, flat and self-furring, and rib metal lath, 1/8 and 3/8 in. (3.2 and 9.6 mm), all with or without backing and designed to be used as a base for gypsum or portland cement plaster.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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Designation: C847 – 09
Standard Specification for
1
Metal Lath
This standard is issued under the fixed designation C847; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) 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* thickness of other rib metal lath shall be as designated, ⁄8 in.
(9.6mm).Thenominalthicknessofself-furringdiamondmesh
1.1 This specification covers sheet lath, expanded metal
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1 shall be ⁄16 in. (7.9 mm).
lath, diamond mesh, flat and self-furring, and rib metal lath, ⁄8
4.2 Width—The nominal width of metal lath shall be 27 in.
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and ⁄8 in. (3.2 and 9.6 mm), all with or without backing and
(686 mm).
designed to be used as a base for gypsum or portland cement
4.3 Length—The nominal length of metal lath shall be 96
plaster.
in. (2438 mm).
1.2 The values stated in inch-pound units are to be regarded
4.4 Weight—The nominal weight of metal lath shall be as
as standard. The values given in parentheses are mathematical
follows:
conversions to SI units that are provided for information only
4.4.1 U.S. Nominal Weights:
and are not considered standard.
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2. Referenced Documents
Type: Weight, lb/yd (kg/m )
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2.1 ASTM Standards:
Diamond mesh 2.5 (1.4); 3.4 (1.8)
A653/A653M Specification for Steel Sheet, Zinc-Coated
Flat rib 1.8 (1.0); 2.75 (1.5); 3.4 (1.8)
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⁄8-in. rib 3.4 (1.8); 4.0 (2.1)
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
Sheet 4.5 (2.4)
by the Hot-Dip Process
4.4.2 Canadian Nominal Weights:
3. Material
2 2
3.1 Metal lath shall be fabricated from cold-rolled carbon
Type: Weight, lb/yd (kg/m )
steel sheet of commercial quality conforming to Specification
Diamond mesh 2.5 (1.4); 3.0 (1.6); 3.4 (1.8)
A653/A653M. Galvanized metal lath shall have a G60 coating
Flat rib 1.8 (1.0); 2.5 (1.4); 3.0 (1.6)
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in accordance with Specification A653/A653M.
⁄8-in. rib 3.0 (1.6); 3.5 (1.9); 4.0 (2.1)
3.2 Backing shall be attached to the lath sufficiently enough
4.5 Permissible Variations—The permissible variations
to prevent accidental removal during shipping, handling, or
shall be as follows:
installation.Attachment of backing shall also allow lapping of
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4.5.1 Thickness, 6 ⁄64 in. (0.4 mm).
metal to metal and backing to backing, 1 in. (25.4 mm) on the
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4.5.2 Width, 6 ⁄8 in. (9.5 mm).
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ends and ⁄2 in. (12.7 mm) on the sides.
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4.5.3 Length,−0in.,+2 ⁄2 in. (63.5 mm).
4.5.4 Weight, 6 10%.
4. Dimensions, Mass, and Permissible Variations
4.1 Thickness—The nominal thickness of diamond mesh
5. Finish
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and flat rib metal lath shall be ⁄8 in. (3.2 mm). The nominal
5.1 Metal lath shall be fabricated from hot-dipped galva-
nized steel.
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This specification is under the jurisdiction of ASTM Committee C11 on
6. Inspection
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
6.1 Inspection of the material shall be agreed upon between
Related Products.
the purchaser and suppli
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C847–06 Designation: C 847 – 09
Standard Specification for
1
Metal Lath
This standard is issued under the fixed designation C847; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) 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*
1 3
1.1 This specification covers sheet lath, expanded metal lath, diamond mesh, flat and self-furring, and rib metal lath, ⁄8 and ⁄8
in. (3.2 and 9.6 mm), all with or without backing and designed to be used as a base for gypsum or portland cement plaster.
1.2The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A653/A653M Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the
Hot-Dip Process
3. Material
3.1 Metal lath shall be fabricated from cold-rolled carbon steel sheet of commercial quality conforming to Specification
A653/A653M. Galvanized metal lath shall have a G60 coating in accordance with Specification A653/A653M.
3.2 Backing shall be attached to the lath sufficiently enough to prevent accidental removal during shipping, handling, or
installation.Attachment of backing shall also allow lapping of metal to metal and backing to backing, 1 in. (25.4 mm) on the ends
1
and ⁄2 in. (12.7 mm) on the sides.
4. Dimensions, Mass, and Permissible Variations
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4.1 Thickness—The nominal thickness of diamond mesh and flat rib metal lath shall be ⁄8 in. (3.2 mm).The nominal thickness
3 5
of other rib metal lath shall be as designated, ⁄8 in. (9.6 mm). The nominal thickness of self-furring diamond mesh shall be ⁄16
in. (7.9 mm).
4.2 Width—The nominal width of metal lath shall be 27 in. (686 mm).
4.3 Length—The nominal length of metal lath shall be 96 in. (2438 mm).
4.4 Weight—The nominal weight of metal lath shall be as follows:
4.4.1 U.S. Nominal Weights:
2 2
Type: Weight, lb/yd (kg/m )
Diamond mesh 2.5 (1.4); 3.4 (1.8)
Flat rib 1.8 (1.0); 2.75 (1.5); 3.4 (1.8)
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⁄8-in. rib 3.4 (1.8); 4.0 (2.1)
Sheet 4.5 (2.4)
4.4.2 Canadian Nominal Weights:
2 2
Type: Weight, lb/yd (kg/m )
Diamond mesh 2.5 (1.4); 3.0 (1.6); 3.4 (1.8)
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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 C11.02 on Specifications and Test Methods for Accessories and Related Products.
Current edition approved Nov.May 1, 2006.2009. Published November 2006.May 2009. Originally approved in 1977. Last previous edition approved in 20042006 as
C847–046.
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