ASTM C933-07b
(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
1.1This 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.
1.2The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are for information only.
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Designation: C 933 – 07b
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope* resistant.Thebackingshallhaveaburstingstrengthofnotless
than that required to maintain integrity under normal hand- or
1.1 This specification covers welded wire lath, flat or
machine-application pressures.
self-furring,withorwithoutbacking,designedforuseasabase
4.1.3 The backing shall be attached to the lath to prevent
to receive portland cement-based interior plaster and exterior
accidental removal during shipping, handling or installation.
stucco.
Attachment of the backing shall allow lapping of wire-to-wire
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
and backing-to-backing of not less than one mesh at ends and
asthestandard.TheSI(metric)valuesgiveninparenthesesare
1
edges and shall permit full embedment, in not less than ⁄8 in.
for information only.
(3.2mm)ofplaster,ofnotlessthanone-halfofthetotallength
2. Referenced Documents and width of the wire.
2
4.1.4 Thethicknessoftheembedmentofthelathandplaster
2.1 ASTM Standards:
shall be measured from the back plane of the back wire,
A641/A641M SpecificationforZinc−Coated(Galvanized)
exclusive of furring, to the backing or surface of the substrate.
Carbon Steel Wire
C11 Terminology Relating to Gypsum and Related Build-
5. Dimensions and Permissible Variations
ing Materials and Systems
5.1 Openings and Stiffening:
2.2 Federal Specifications:
5.1.1 Lath shall be welded at all intersections of wire to
UU-B-790 Building Paper, Vegetable Fiber: (Kraft, Water-
3
form openings not more than 2 in. (51 mm) by 2 in. (51 mm).
proofed, Water Repellent and Fire Resistant)
5.1.2 Heavy-duty lath shall be stiffened continuously and
3. Terminology
parallel to the long dimension of the lath at intervals of not
morethan6in.(152mm).Wirestiffenersusedforthispurpose
3.1 Definitions of terms used in this standard shall be in
shallrangefrom15-gauge(0.072in.)to11-gauge(0.1205in.).
accordance with TerminologyC11.
The weight per square yard shall range from 1.14 to 1.95
2 2
4. Materials and Manufacture
lb/yd (0.618 to 1.058 kg/m ) for the heavy-duty lath.
5.1.3 Self-furring crimps on self-furring lath shall project
4.1 Welded wire lath shall be fabricated from not less than
1
not less than ⁄4 in. (6.4 mm) from the plane of the back of the
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
lath.
conforming to Specification A641/A641M.
1
5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2
4.1.1 The wire shall be zinc-coated (galvanized) in accor-
mm), exclusive of self-furring crimps, with a permissible
dance with Specification A641/A641M.
1
variation of 6 ⁄32 in. (0.8 mm).
4.1.2 The backing shall conform to Federal Specification
5.3 Width—The nominal width shall be 28 in. (710 mm) to
UU-B-790. The backing shall be either absorptive or water
3
54 in. (1370 mm), with a permissible variation of 6 ⁄4 in. (19
mm).
1
This specification is under the jurisdiction of ASTM Committee C11 on
5.4 Length—The minimum length shall be 48 in. (1220
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
mm) for sheets or a maximum of 150 ft (45.720 m) for rolls
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
3
with a permissible variation of 6 ⁄4 in. (19 mm) for sheets or
Related Products.
Current edition approved Nov. 15, 2007. Published December 2007. Originally
rolls.
approved in 1980. Last previous edition approved in 2007 as C933–07a.
5.5 Weight—The nominal weight, exclusive of backing,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
2 2
shall be from 1.14 to 1.95 lb/yd (0.618 to 1.058 kg/m ).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Permissiblevariationinpercentageoverandunderthenominal
the ASTM website.
weights shall be in accordance with mill tolerances.
3
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,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
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C 933 – 07b
6. Sampling producer or supplier promptly and in writing. The notice of
rejection shall contain a statement documenting how the
6.1 When specified by the purchase agreement, samples of
welded wire
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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:C933–07a Designation: C 933 – 07b
Standard Specification for
1
Welded Wire Lath
This standard is issued under the fixed designation C 933; 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.
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 the standard. The SI (metric) values given in parentheses are
for information only.
2. Referenced Documents
2
2.1 ASTM Standards:
A 641/A 641M Specification for ZincCoated (Galvanized) Carbon Steel Wire
C 11 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 C 11.
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 A 641/A 641M.
4.1.1 The wire shall be zinc-coated (galvanized) in accordance with Specification A 641/A 641M.
4.1.2 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.
4.1.3 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 ⁄8 in. (3.2 mm) of plaster, of not less than one-half of the total length and width
of the wire.
4.1.4 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
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 plane of the back of the lath.
1
5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2 mm), exclusive of self-furring crimps, with a permissible variation
1
of 6 ⁄32 in. (0.8 mm).
3
5.3 Width—The nominal width shall be 28 in. (710 mm) to 54 in. (1370 mm), with a permissible variation of 6 ⁄4 in. (19 mm).
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 Aug. 1,Nov. 15, 2007. Published AugustDecember 2007. Originally approved in 1980. Last previous edition approved in 2007 as C 933 – 07a.
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 ----------------------
C 933 – 07b
5.4 Length—The nominalminimum length shall be 9648 in. (2440(1220 mm) or 104 in. (2640 mm) for sheets or a maximum
3
of 150 ft (45.720 m) for rolls with a permissible variation o
...
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