ASTM C933-05

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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2005
• ICS: 77.140.65 - Steel wire, wire ropes and link chains
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.02 - Specifications and Test Methods for Accessories and Related Products

Relations

• Replaced By: ASTM C933-07 - Standard Specification for Welded Wire Lath
• Effective Date: 01-Jul-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 933 – 05
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 (ε) indicates an editorial change since the last revision or reapproval.
1. Scope* 4.1.1 The wire shall be zinc-coated (galvanized) in accor-
dance with Specification A 641.
1.1 This specification covers welded wire lath, flat or
4.1.2 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 SI units are to be regarded as the
machine-application pressures.
standard. The values given in parentheses are for information
4.1.3 The backing shall be attached to the lath to prevent
only.
accidental removal during shipping, handling or installation.
2. Referenced Documents Attachment of the backing shall allow lapping of wire-to-wire
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and backing-to-backing of not less than one mesh at ends and
2.1 ASTM Standards:
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edges and shall permit full embedment, in not less than ⁄8 in.
A 641 Specification for Zinc-Coated (Galvanized) Carbon
(3.2 mm) of plaster, of not less than one-half of the total length
Steel Wire
and width of the wire.
C11 Terminology Relating to Gypsum and Related Build-
4.1.4 Thethicknessoftheembedmentofthelathandplaster
ing Materials and Systems
shall be measured from the back plane of the back wire,
2.2 Federal Specifications:
exclusive of furring, to the backing or surface of the substrate.
UU-B-790 Building Paper, Vegetable Fiber: (Kraft, Water-
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proofed, Water Repellent and Fire Resistant)
5. Dimensions and Permissible Variations
3. Terminology
5.1 Openings and Stiffening:
5.1.1 Lath shall be welded at all intersections of wire to
3.1 Definitions of terms used in this standard shall be in
form openings not more than 2 in. (51 mm) by 2 in. (51 mm).
accordance with TerminologyC11.
5.1.2 Heavy-duty lath shall be stiffened continuously and
4. Materials and Manufacture
parallel to the long dimension of the lath at intervals of not
more than 6 in. (152 mm).Wire stiffeners used for this purpose
4.1 Welded wire lath shall be fabricated from not less than
shall range from 15-gauge (0.072 in.) to 11-gauge (0.1205 in.).
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
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Theweightpersquareyardshallrangefrom1.14lb/yd to1.83
conforming to Specification A 641.
2
lb/yd for the heavy-duty lath.
5.1.3 Self-furring crimps on self-furring lath shall project
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This specification is under the jurisdiction of ASTM Committee C11 on
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not less than ⁄4 in. (6.4 mm) from the plane of the back of the
Gypsum and Related Building Materials and Systems and is the direct responsibility
lath.
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
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5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2
Related Products.
Current edition approved Oct. 1, 2005. Published October 2005. Originally
mm), exclusive of self-furring crimps, with a permissible
approved in 1980. Last previous edition approved in 2004 as C 933 – 04.
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variation of6 ⁄32 in. (0.8 mm).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 Width—The nominal width shall be 28 in. (710 mm) or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on 38 in. (965 mm), with a permissible variation of6 ⁄4 in. (19
the ASTM website.
mm).
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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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C933–05
5.4 Length—The nominal length shall be 96 in. (2440 mm) 8. Rejection
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or 104 in. (2640 mm) with a permissible variation of6 ⁄4 in.
8.1 Rejectionofweldedwirelaththatfailstoconformtothe
(19 mm).
requirements of the specification shall be reported to the
5.5 Weight—The nominal weight, exclusive of backing, producer or supplier promptly and in writing. The notice of
2 2
shall be from 1.14 to 1.83 lb/yd (0.618 to 0.993 kg/m ). rejection shall contain a statement documenting how the
welded wire lath has failed to conform to the requirements of
Permissiblevariationinpercentageoverandundertheno
...