ASTM C933-14
(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 −14
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* 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
to receive portland cement-based interior plaster and exterior UU-B-790. The backing shall be either absorptive or water
stucco. resistant. The backing shall have a bursting strength of not less
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
2. Referenced Documents
and backing-to-backing of not less than one mesh at ends and
1
2
edges and shall permit full embedment, in not less than ⁄4 in.
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
C11 Terminology Relating to Gypsum and Related Building 4.1.5 Thethicknessoftheembedmentofthelathandplaster
Materials and Systems shall be measured from the back plane of the back wire,
exclusive of furring, to the backing or surface of the substrate.
2.2 Federal Specifications:
UU-B-790 Building Paper, Vegetable Fiber: (Kraft,
3
5. Dimensions and Permissible Variations
Waterproofed, Water Repellent and Fire Resistant)
5.1 Openings and Stiffening:
3. Terminology
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 Terminology C11.
5.1.2 Reinforced lath shall be permitted to be reinforced
continuously and parallel to the long dimension of the lath at
4. Materials and Manufacture
intervals of not more than 6 in. (150 mm). Wires used for this
4.1 Welded wire lath shall be fabricated from not less than
purpose shall range from 0.072 in. (1.9 mm) to 0.1205 in.
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
(3.1 mm). Reduction of the size of the openings to less than
conforming to Specification A641/A641M.
2 in. (51 mm) by 2 in. (51 mm) shall also be permitted.
4.1.1 Diameter tolerance for galvanized wire shall be in
5.1.3 Self-furring crimps on self-furring lath shall project
accordance with Specification A641/A641M.
1
not less than ⁄4 in. (6 mm) from the plane of the back of the
lath.
1
1
This specification is under the jurisdiction of ASTM Committee C11 on
5.2 Thickness—The nominal thickness shall be ⁄8 in.
Gypsum and Related Building Materials and Systems and is the direct responsibility
(3.2 mm), exclusive of self-furring crimps, with a permissible
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
1
variation of 6 ⁄32 in. (0.8 mm).
Related Products.
Current edition approved Aug. 15, 2014. Published October 2014. Originally
5.3 Width—The nominal width shall be 28 in. (700 mm) to
approved in 1980. Last previous edition approved in 2013 as C933 – 13. DOI:
3
10.1520/C0933-14.
54 in. (1370 mm), with a permissible variation of 6 ⁄4 in.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
(19 mm).
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
5.4 Length—Theminimumlengthshallbe48in.(1200mm)
the ASTM website.
3 for sheets or a maximum of 150 ft (45.720 m) for rolls with a
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
3
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. permissible variation of 6 ⁄4 in. (19 mm) for sheets or rolls.
*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
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C933−14
5.5 Weight—The weight, exclusive of backing, shall be a 9. Packaging and Package Marking
2 2
minimum of 1.14 lb/yd (0.618 kg/m ). The weight of rein-
9.1 Packaging—Wel
...
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 − 13 C933 − 14
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 Zinc–Coated (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.
4.1.1 Diameter tolerance for galvanized wire shall be in accordance with Specification A641/A641M.
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.
4.1.4 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.
4.1.5 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. 2 in. (51 mm) by 2 in. (51 mm).
5.1.2 Reinforced lath shall be permitted to be reinforced continuously and parallel to the long dimension of the lath at intervals
of not more than 6 in. (150 mm). Wires used for this purpose shall range from 0.072 in. (1.9 mm) to 0.1205 in. (3.1 mm). (3.1 mm).
Reduction of the size of the openings to less than 2 in. 2 in. (51 mm) by 2 in. 2 in. (51 mm) shall also be permitted.
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 May 1, 2013Aug. 15, 2014. Published June 2013October 2014. Originally approved in 1980. Last previous edition approved in 20112013 as
C933 – 11.C933 – 13. DOI: 10.1520/C0933-13.10.1520/C0933-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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 the ASTM website.
3
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*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
---------------------- Page: 1 ----------------------
C933 − 14
1
5.1.3 Self-furring crimps on self-furring lath shall project not less than ⁄4 in. (6 mm) from the plane of the back of the lath.
1
5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2 mm), (3.2 mm), exclusive of self-furring crimps, with a permissible
1
variation of 6 ⁄32 in. (0.8 mm).
3
5.3 Width—The nominal width shall be 28 in. (700 mm) to 54 in. (137
...
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