ASTM C933-09
(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 – 09
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 (´) 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 A641/A641M.
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.Thebackingshallhaveaburstingstrengthofnotless
stucco.
than that required to maintain integrity under normal hand- or
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
machine-application pressures.
as standard. The values given in parentheses are mathematical
4.1.3 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
4.1.4 Thethicknessoftheembedmentofthelathandplaster
C11 TerminologyRelatingtoGypsumandRelatedBuilding
shall be measured from the back plane of the back wire,
Materials and Systems
exclusive of furring, to the backing or surface of the substrate.
2.2 Federal Specifications:
UU-B-790 Building Paper, Vegetable Fiber: (Kraft, Water-
5. Dimensions and Permissible Variations
3
proofed, 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
form openings not more than 2 in. (51 mm) by 2 in. (51 mm).
3.1 Definitions of terms used in this standard shall be in
5.1.2 Heavy-duty lath shall be stiffened continuously and
accordance with Terminology C11.
parallel to the long dimension of the lath at intervals of not
4. Materials and Manufacture
morethan6in.(152mm).Wirestiffenersusedforthispurpose
shallrangefrom15-gauge(0.072in.)to11-gauge(0.1205in.).
4.1 Welded wire lath shall be fabricated from not less than
The weight per square yard shall range from 1.14 to 1.95
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
2 2
lb/yd (0.618 to 1.058 kg/m ) for the heavy-duty lath.
conforming to Specification A641/A641M.
5.1.3 Self-furring crimps on self-furring lath shall project
1
not less than ⁄4 in. (6.4 mm) from the plane of the back of the
lath.
1
This specification is under the jurisdiction of ASTM Committee C11 on
1
5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
mm), exclusive of self-furring crimps, with a permissible
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
1
Related Products. variation of 6 ⁄32 in. (0.8 mm).
Current edition approved July 15, 2009. Published August 2009. Originally
5.3 Width—The nominal width shall be 28 in. (710 mm) to
approved in 1980. Last previous edition approved in 2007 as C933–07b. DOI:
3
54 in. (1370 mm), with a permissible variation of 6 ⁄4 in. (19
10.1520/C0933-09.
2
mm).
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
5.4 Length—The minimum length shall be 48 in. (1220
Standards volume information, refer to the standard’s Document Summary page on
mm) for sheets or a maximum of 150 ft (45.720 m) for rolls
the ASTM website.
3
3 with a permissible variation of 6 ⁄4 in. (19 mm) for sheets or
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. rolls.
*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 ----------------------
C933 – 09
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 1.95 lb/yd (0.618 to 1.058 kg/m ). rejection shall contain a statement documenting how the
Permissiblevariationinpercentageoverandunderthenominal
welded wire lath has failed t
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:C933–07b Designation: C 933 – 09
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 (´) 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.
1.2The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are for
information only.
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:
A 641/A 641M Specification for ZincCoated (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 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 ⁄4 in. (3.2(6 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).
5.1.2Heavy-duty5.1.2 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
2 2
in.). The weight 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
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 Nov.July 15, 2007.2009. Published December 2007.August 2009. Originally approved in 1980. Last previous edition approved in 2007 as
C 933 – 07ab.
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 ----------------------
C933–09
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. (13
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:C933–07b Designation: C 933 – 09
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 (´) 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.
1.2The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are for
information only.
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:
A 641/A 641M Specification for ZincCoated (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 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 ⁄4 in. (3.2(6 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).
5.1.2Heavy-duty5.1.2 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
2 2
in.). The weight 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
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 Nov.July 15, 2007.2009. Published December 2007.August 2009. Originally approved in 1980. Last previous edition approved in 2007 as
C 933 – 07ab.
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 ----------------------
C933–09
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. (13
...
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