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ASTM C933-96a

(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.

General Information

Status
Historical
Publication Date
09-Nov-1996
Technical Committee
C11 - Gypsum and Related Building Materials and Systems
Drafting Committee
C11.02 - Specifications and Test Methods for Accessories and Related Products
Current Stage
Ref Project

Relations

Replaced By
ASTM C933-96a(2001) - Standard Specification for Welded Wire Lath
Effective Date
10-Nov-1996
Referred By
ASTM C841-23 - Standard Specification for Installation of Interior Lathing and Furring
Effective Date
10-Nov-1996
Referred By
ASTM C1780-23a - Standard Practice for Installation Methods for Cement-based Adhered Masonry Veneer
Effective Date
10-Nov-1996
Referred By
ASTM C1063-23 - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
Effective Date
10-Nov-1996

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ASTM C933-96a - Standard Specification for Welded Wire LathASTM C933-96a - Standard Specification for Welded Wire Lath
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ASTM C933-96a - Standard Specification for Welded Wire Lath
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 933 – 96a
Standard Specification for
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 * under normal hand- or machine-application pressures.
4.1.3 The backing shall be attached to the lath to prevent
1.1 This specification covers welded wire lath, flat or
accidental removal during shipping, handling or installation.
self-furring, with or without backing, designed for use as a base
Attachment of the backing shall allow lapping of wire-to-wire
to receive portland cement-based interior plaster and exterior
and backing-to-backing of not less than one mesh at ends and
stucco.
edges and shall permit full embedment, in not less than ⁄8 in.
1.2 The values stated in SI units are to be regarded as the
(3.2 mm) of plaster, of not less than one-half of the total length
standard. The values given in parentheses are for information
and width of the wire.
only.
4.1.4 The thickness of the embedment of the lath and plaster
2. Referenced Documents shall be measured from the back plane of the back wire,
exclusive of furring, to the backing or surface of the substrate.
2.1 ASTM Standards:
A 390 Specification for Zinc-Coated (Galvanized) Steel
5. Dimensions and Permissible Variations
Poultry Netting (Hexagonal and Straight Line) and Woven
5.1 Openings and Stiffening:
Steel Poultry Fencing
5.1.1 Lath shall be welded at all intersections of wire to
A 641 Specification for Zinc-Coated (Galvanized) Carbon
form openings not more than 2 in. (51 mm) by 2 in. (51 mm).
Steel Wire
Lath shall be stiffened continuously and parallel to the long
C 11 Terminology Relating to Gypsum and Related Build-
dimension of the lath at intervals of not more than 6 in. (152
ing Materials and Systems
3 mm) with wire not less than 0.0720 in. (1.829 mm) in diameter.
2.2 Federal Specifications:
5.1.2 Self-furring crimps on self-furring lath shall project
UU-B-790 Building Paper, Vegetable Fiber: (Kraft, Water-
not less than ⁄4 in. (6.4 mm) from the plane of the back of the
proofed, Water Repellent and Fire Resistant)
lath.
3. Terminology 5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2
mm), exclusive of self-furring crimps, with a permissible
3.1 Definitions of terms used in this standard shall be in
variation of 6 ⁄32 in. (0.8 mm).
accordance with Terminology C 11.
5.3 Width—The nominal width shall be 28 in. (710 mm) or
4. Materials and Manufacture
38 in. (965 mm), with a permissible variation of 6 ⁄4 in. (19
mm).
4.1 Welded wire lath shall be fabricated from not less than
5.4 Length—The nominal length shall be 96 in. (2440 mm)
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
or 104 in. (2640 mm) with a permissible variation of 6 ⁄4 in.
conforming to Specification A 641.
(19 mm).
4.1.1 The wire shall be zinc-coated (galvanized) in accor-
5.5 Weight—The nominal weight, exclusive of backing,
dance with Specification A 390, Class 1.
2 2
shall be from 1.14 to 1.83 lb/yd (0.618 to 0.993 kg/m ).
4.1.2 The backing shall be paper or felt, conforming to
Permissible variation in percentage over and under the nominal
Federal Specification UU-B-790. The backing shall be either
weights shall be in accordance with mill tolerances.
absorptive or water resistant. The backing shall have a bursting
strength of not less than that required to maintain integrity
6. Sampling
6.1 When specified by the purchase agreement, samples of
This specification is under the jurisdiction of ASTM Committee C-11 on
welded wire lath shall be taken at the place of manufact
...

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