ASTM C933-07a
(Specification)Standard Specification for Welded Wire Lath
Standard Specification for Welded Wire Lath
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.
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Designation: C 933 – 07a
Standard Specification for
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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.The backing shall have a bursting strength of not less
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 The values stated in inch-pound units are to be regarded
and backing-to-backing of not less than one mesh at ends and
asthestandard.TheSI(metric)valuesgiveninparenthesesare
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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.
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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-
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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
shall range from 15-gauge (0.072 in.) to 11-gauge (0.1205 in.).
accordance with TerminologyC11.
The weight per square yard shall range from 1.14 to 1.95
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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
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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.
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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.
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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
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54 in. (1370 mm), with a permissible variation of 6 ⁄4 in. (19
mm).
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This specification is under the jurisdiction of ASTM Committee C11 on
5.4 Length—The nominal length shall be 96 in. (2440 mm)
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
or 104 in. (2640 mm) for sheets or a maximum of 150 ft
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
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(45.720m)forrollswithapermissiblevariationof 6 ⁄4in.(19
Related Products.
Current edition approved Aug. 1, 2007. Published August 2007. Originally mm).
approved in 1980. Last previous edition approved in 2007 as C933–07.
5.5 Weight—The nominal weight, exclusive of backing,
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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
Permissiblevariationinpercentageoverandunderthenominal
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
weights shall be in accordance with mill tolerances.
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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.
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C 933 – 07a
6. Sampling rejection shall contain a statement documenting how the
welded wire lath has failed to conform to the requirements of
6.1 When specified by the purchase agreement, samples
...
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