ASTM C933-11
(Specification)Standard Specification for Welded Wire Lath
Standard Specification for Welded Wire Lath
ABSTRACT
This specification covers welded wire lath, flat or self-furring, with or without backing, designed for use as a base to receive Portland cement-based interior plaster and exterior stucco. Welded wire lath shall be fabricated from cold-drawn, galvanized steel wire, conforming to the referenced specification. The wire shall be zinc-coated and the backling shall be attached to the lath to prevent accidental removal during shipping, handling, or installation. The thickness of the embedment of the lath and plaster shall be measured from the back plane of the back wire, exclusive for furring, to the backing or surface of the substrate.
SCOPE
1.1 This specification covers welded wire lath, flat or self-furring, with or without backing, designed for use as a base to receive portland cement-based interior plaster and exterior stucco.
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:C933 −11
StandardSpecification for
1
Welded Wire Lath
This standard is issued under the fixed designation C933; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 4.1.2 The wire shall be zinc-coated (galvanized) in accor-
dance with Specification A641/A641M.
1.1 This specification covers welded wire lath, flat or
4.1.3 The backing shall conform to Federal Specification
self-furring,withorwithoutbacking,designedforuseasabase
UU-B-790. The backing shall be either absorptive or water
to receive portland cement-based interior plaster and exterior
resistant. The backing shall have a bursting strength of not less
stucco.
than that required to maintain integrity under normal hand- or
1.2 The values stated in inch-pound units are to be regarded
machine-application pressures.
as standard. The values given in parentheses are mathematical
4.1.4 The backing shall be attached to the lath to prevent
conversions to SI units that are provided for information only
accidental removal during shipping, handling or installation.
and are not considered standard.
Attachment of the backing shall allow lapping of wire-to-wire
and backing-to-backing of not less than one mesh at ends and
2. Referenced Documents
1
edges and shall permit full embedment, in not less than ⁄4 in.
2
2.1 ASTM Standards:
(6 mm) of plaster, of not less than one-half of the total length
A641/A641M Specification for Zinc–Coated (Galvanized)
and width of the wire.
Carbon Steel Wire
4.1.5 Thethicknessoftheembedmentofthelathandplaster
C11 Terminology Relating to Gypsum and Related Building
shall be measured from the back plane of the back wire,
Materials and Systems
exclusive of furring, to the backing or surface of the substrate.
2.2 Federal Specifications:
UU-B-790 Building Paper, Vegetable Fiber: (Kraft, 5. Dimensions and Permissible Variations
3
Waterproofed, Water Repellent and Fire Resistant)
5.1 Openings and Stiffening:
5.1.1 Lath shall be welded at all intersections of wire to
3. Terminology
form openings not more than 2 in. (51 mm) by 2 in. (51 mm).
3.1 Definitions of terms used in this standard shall be in
5.1.2 Heavy-duty lath shall be stiffened continuously and
accordance with Terminology C11.
parallel to the long dimension of the lath at intervals of not
more than 6 in. (152 mm).Wire stiffeners used for this purpose
4. Materials and Manufacture
shall range from 15-gauge (0.072 in.) to 11-gauge (0.1205 in.).
The weight per square yard shall range from 1.14 to 1.95
4.1 Welded wire lath shall be fabricated from not less than
2 2
lb/yd (0.618 to 1.058 kg/m ) for the heavy-duty lath.
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
5.1.3 Self-furring crimps on self-furring lath shall project
conforming to Specification A641/A641M.
1
not less than ⁄4 in. (6.4 mm) from the plane of the back of the
4.1.1 Diameter tolerance for galvanized wire shall be in
lath.
accordance with Specification A641/A641M.
1
5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2
mm), exclusive of self-furring crimps, with a permissible
1
This specification is under the jurisdiction of ASTM Committee C11 on 1
variation of 6 ⁄32 in. (0.8 mm).
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
5.3 Width—The nominal width shall be 28 in. (710 mm) to
Related Products.
3
54 in. (1370 mm), with a permissible variation of 6 ⁄4 in. (19
Current edition approved Dec. 1, 2011. Published January 2011. Originally
mm).
approved in 1980. Last previous edition approved in 2009 as C933 – 09. DOI:
10.1520/C0933-11.
5.4 Length—Theminimumlengthshallbe48in.(1220mm)
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
for sheets or a maximum of 150 ft (45.720 m) for rolls with a
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on permissible variation of 6 ⁄4 in. (19 mm) for sheets or rolls.
the ASTM website.
3
5.5 Weight—The nominal weight, exclusive of backing,
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
2 2
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. shall be from 1.14 to 1.95 lb/yd (0.618 to 1.058 kg/m ).
*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
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C933−11
Permissiblevariationinpercentageoverandunderthenominal prod
...
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:C933–09 Designation: C933 – 11
Standard Specification for
1
Welded Wire Lath
This standard is issued under the fixed designation C933; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers welded wire lath, flat or self-furring, with or without backing, designed for use as a base to receive
portland cement-based interior plaster and exterior stucco.
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:
A641/A641M Specification for ZincCoated (Galvanized) Carbon Steel Wire
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
2.2 Federal Specifications:
3
UU-B-790 Building Paper, Vegetable Fiber: (Kraft, Waterproofed, Water Repellent and Fire Resistant)
3. Terminology
3.1 Definitions of terms used in this standard shall be in accordance with Terminology C11.
4. Materials and Manufacture
4.1 Welded wire lath shall be fabricated from not less than 0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
conforming to Specification A641/A641M.
4.1.1The wire shall be zinc-coated (galvanized) in accordance with Specification
4.1.1 Diameter tolerance for galvanized wire shall be in accordance with Specification A641/A641M.
4.1.2The backing shall conform to Federal Specification UU-B-790
4.1.2 The wire shall be zinc-coated (galvanized) in accordance with Specification A641/A641M.
4.1.3 The backing shall conform to Federal Specification UU-B-790. The backing shall be either absorptive or water resistant.
The backing shall have a bursting strength of not less than that required to maintain integrity under normal hand- or
machine-application pressures.
4.1.3The4.1.4 The backing shall be attached to the lath to prevent accidental removal during shipping, handling or installation.
Attachment of the backing shall allow lapping of wire-to-wire and backing-to-backing of not less than one mesh at ends and edges
1
and shall permit full embedment, in not less than ⁄4 in. (6 mm) of plaster, of not less than one-half of the total length and width
of the wire.
4.1.4The4.1.5 The thickness of the embedment of the lath and plaster shall be measured from the back plane of the back wire,
exclusive of furring, to the backing or surface of the substrate.
5. Dimensions and Permissible Variations
5.1 Openings and Stiffening:
5.1.1 Lath shall be welded at all intersections of wire to form openings not more than 2 in. (51 mm) by 2 in. (51 mm).
5.1.2 Heavy-duty lath shall be stiffened continuously and parallel to the long dimension of the lath at intervals of not more than
6 in. (152 mm). Wire stiffeners used for this purpose shall range from 15-gauge (0.072 in.) to 11-gauge (0.1205 in.). The weight
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.
Current edition approved July 15, 2009. Published August 2009. Originally approved in 1980. Last previous edition approved in 2007 as C933–07b. DOI:
10.1520/C0933-09.
Current edition approved Dec. 1, 2011. Published January 2011. Originally approved in 1980. Last previous edition approved in 2009 as C933 – 09. DOI:
10.1520/C0933-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*ASummary 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 ----------------------
C933 – 11
2 2
per square yard shall range from 1.14 to 1.95 lb/yd (0.618 to 1.058 kg/m ) for the heavy-duty lath.
1
5.1.3 Self-furring crimps on self-furring lath shall project not less than ⁄4 in. (6.4 mm) from the pla
...
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