ASTM C933-04
(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 SI units are to be regarded as the standard. The values given in parentheses are for information only.
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Designation: C 933 – 04
Standard Specification for
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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* absorptive or water resistant.The backing shall have a bursting
strength of not less than that required to maintain integrity
1.1 This specification covers welded wire lath, flat or
under normal hand- 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 SI units are to be regarded as the
and backing-to-backing of not less than one mesh at ends and
standard. The values given in parentheses are for information
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edges and shall permit full embedment, in not less than ⁄8 in.
only.
(3.2 mm) of plaster, of not less than one-half of the total length
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,
A 641 Specification for Zinc-Coated (Galvanized) Carbon
exclusive of furring, to the backing or surface of the substrate.
Steel Wire
C 11 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)
Lath shall be stiffened continuously and parallel to the long
3. Terminology
dimension of the lath at intervals of not more than 6 in. (152
mm)withwirenotlessthan0.0720in.(1.829mm)indiameter.
3.1 Definitions of terms used in this standard shall be in
5.1.2 Self-furring crimps on self-furring lath shall project
accordance with Terminology C 11.
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not less than ⁄4 in. (6.4 mm) from the plane of the back of the
4. Materials and Manufacture
lath.
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5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2
4.1 Welded wire lath shall be fabricated from not less than
mm), exclusive of self-furring crimps, with a permissible
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
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variation of 6 ⁄32 in. (0.8 mm).
conforming to Specification A 641.
5.3 Width—The nominal width shall be 28 in. (710 mm) or
4.1.1 The wire shall be zinc-coated (galvanized) in accor-
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38 in. (965 mm), with a permissible variation of 6 ⁄4 in. (19
dance with Specification A 641.
mm).
4.1.2 The backing shall be paper or felt, conforming to
5.4 Length—The nominal length shall be 96 in. (2440 mm)
Federal Specification UU-B-790. The backing shall be either
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or 104 in. (2640 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
5.5 Weight—The nominal weight, exclusive of backing,
Gypsum and Related Building Materials and Systems and is the direct responsibility
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shall be from 1.14 to 1.83 lb/yd (0.618 to 0.993 kg/m ).
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Related Products. Permissiblevariationinpercentageoverandunderthenominal
Current edition approved May 1, 2004. Published May 2004. Originally
weights shall be in accordance with mill tolerances.
approved in 1980. Last previous edition approved in 2001 as C 933 – 96a(2001).
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6. Sampling
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
6.1 When specified by the purchase agreement, samples of
the ASTM website.
welded wire lath shall be taken at the place of manufacture or
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AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
at the place of destination. If samples are taken at the
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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C933–04
destination, such samples shall be taken within 24 h of the 9. Packaging and Package Marking
receipt of the material.
9.1 Nominal 96 in. (2440 mm) lengths shall be packaged
6.2 At least
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