ASTM C847-12
(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 −12
StandardSpecification 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.
3
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
5
shall be ⁄16 in. (7.9 mm).
1
lath, diamond mesh, flat and self-furring, and rib metal lath, ⁄8
3
and ⁄8 in. (3.2 and 9.6 mm), all with or without backing and
4.2 Width—Theminimumwidthofmetallathshallbe27in.
designed to be used as a base for gypsum or portland cement (686 mm).
plaster.
4.3 Length—The minimum length of metal lath shall be 97
1.2 The values stated in inch-pound units are to be regarded in. (2464 mm).
as standard. The values given in parentheses are mathematical
4.4 Weight—The weight of metal lath shall be as follows:
conversions to SI units that are provided for information only
4.4.1 U.S. Weights:
and are not considered standard.
2 2
Type: Weight, lb/yd (kg/m )
2. Referenced Documents
Diamond mesh 2.5 (1.4); 3.4 (1.8)
2 Flat rib 1.8 (1.0); 2.75 (1.5); 3.4 (1.8)
2.1 ASTM Standards:
3
⁄8-in. rib 3.4 (1.8); 4.0 (2.1)
A653/A653MSpecification for Steel Sheet, Zinc-Coated
4.4.2 Canadian Weights:
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
2 2
Type: Weight, lb/yd (kg/m )
by the Hot-Dip Process
Diamond mesh 2.5 (1.4); 3.0 (1.6); 3.4 (1.8)
3. Material
Flat rib 1.8 (1.0); 2.5 (1.4); 3.0 (1.6)
3
⁄8-in. rib 3.0 (1.6); 3.5 (1.9); 4.0 (2.1)
3.1 Metal lath shall be fabricated from cold-rolled carbon
4.5 Permissible Variations—The permissible variations
steel sheet of commercial quality conforming to Specification
shall be as follows:
A653/A653M. Galvanized metal lath shall have a G60 coating
1
4.5.1 Thickness, 6 ⁄64 in. (0.4 mm).
in accordance with Specification A653/A653M.
3
4.5.2 Width, 6 ⁄8 in. (9.5 mm).
3.2 Backing shall be attached to the lath sufficiently enough
1
4.5.3 Length, −0 in.,+1 ⁄2 in. (38.1 mm).
to prevent accidental removal during shipping, handling, or
4.5.4 Weight,±10%.
installation.Attachment of backing shall also allow lapping of
metal to metal and backing to backing, 1 in. (25.4 mm) on the
5. Finish
1
ends and ⁄2 in. (12.7 mm) on the sides.
5.1 Metal lath shall be fabricated from hot-dipped galva-
4. Dimensions, Mass, and Permissible Variations nized steel.
4.1 Thickness—The nominal thickness of diamond mesh
1 6. Weight Test
and flat rib metal lath shall be ⁄8 in. (3.2 mm). The nominal
6.1 Significance and Use—This test method provides a
procedure for measuring the weight of a single sheet of metal
1
This specification is under the jurisdiction of ASTM Committee C11 on
lath. It shall be used to determine compliance with this
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
specification. The degree of performance of this test method
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Related Products.
with service performance has not been determined.
Current edition approved April 1, 2012. Published May 2012. Originally
6.2 Apparatus:
approved in 1977. Last previous edition approved in 2010 as C847–10a. DOI:
10.1520/C0847-12.
6.2.1 Scale, capable of weighing in increments of 0.1 lb
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
(0.05 kg) or 1 oz (28 g).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.2.2 Tape Measure, capable of measuring in increments of
Standards volume information, refer to the standard’s Document Summary page on
1
the ASTM website. ⁄16 in (1.6 mm).
*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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C847 − 12
6.3 Materials shall satisfy the following: 6.8 Report—Report shall indicate the total number of speci-
6.3.1 Metal Lath—Specification C847. mens tested and the number of specimens meeting the require-
ments of this specification.
6.4 Sampling—Onesheetshallbeselectedfromeachbundle
or package, but not more than five sheets from any one 6.9 Precision and Bias—No statement is made about either
shipment for testing. the precision or bias of this test method since the result merely
states whether or not there is conformance to the criteria for
6.5 Specimen Preparation:
success specified in the procedure.
6.5.1 Measure and record the width and len
...
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:C847–10a Designation: C847 – 12
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.
1.2 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
1
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 minimum width of metal lath shall be 27 in. (686 mm).
4.3 Length—The minimum length of metal lath shall be 97 in. (2464 mm).
4.4 Weight—The nominal weight of metal lath shall be as follows:
4.4.1 U.S. Nominal WeightsU.S. 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)
3
⁄8-in. rib 3.4 (1.8); 4.0 (2.1)
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)
Flat rib 1.8 (1.0); 2.5 (1.4); 3.0 (1.6)
3
⁄8-in. rib 3.0 (1.6); 3.5 (1.9); 4.0 (2.1)
4.5 Permissible Variations—The permissible variations shall be as follows:
1
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.
CurrenteditionapprovedOct.April1,2010.2012.PublishedNovember2010.May2012.Originallyapprovedin1977.Lastpreviouseditionapprovedin2010asC847–10a.
DOI: 10.1520/C0847-10a. 10.1520/C0847-12.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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.
1
---------------------- Page: 1 ----------------------
C847 – 12
1
4.5.1 Thickness, 6 ⁄64 in. (0.4 mm).
3
4.5.2 Width, 6 ⁄8 in. (9.5 mm).
1
4.5.3 Length,−0in.,+1 ⁄2 in. (38.1 mm).
4.5.4 Weight, 6 10%.
5. Finish
5.1 Metal lath shall be fabricated from hot-dipped galvanized steel.
6. Weight Test
6.1 Significance and Use—This test method provides a procedure for measuring the weight of a single sheet of metal lath. It
shall be used to determine compliance with this specification. The degree of performance of this test method with service
performance has not been determined.
6.2 Apparatus:
6.2.1 Scale, capable of weighing in increments of 0.1 lb (0.05 kg) or 1 oz (28 g).
1
6.2.2 Tape Measure, capable of measuring in increments of ⁄16 in (1.6 mm).
6.3 Materials shall satisfy the following:
6.3.1 Metal Lath—Specification C847.
6.4 Sampling—One sheet shall be selected from each bundle or package, but not more than five sheets from any one shipment
for testing.
6.5 Specimen Preparation:
6.5.1 Measure and record the width a
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