ASTM C933-96a(2001)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C 933 – 96a (Reapproved 2001)
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 * 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, with or without backing, designed for use as a base
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
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.
4.1.4 The thickness of the embedment of the lath and plaster
2.1 ASTM Standards:
shall be measured from the back plane of the back wire,
A 390 Specification for Zinc-Coated (Galvanized) Steel
exclusive of furring, to the backing or surface of the substrate.
Poultry Fence Fabric (Hexagonal and Straight Line)
A 641 Specification for Zinc-Coated (Galvanized) Carbon
5. Dimensions and Permissible Variations
Steel Wire
5.1 Openings and Stiffening:
C 11 Terminology Relating to Gypsum and Related Build-
5.1.1 Lath shall be welded at all intersections of wire to
ing Materials and Systems
form openings not more than 2 in. (51 mm) by 2 in. (51 mm).
2.2 Federal Specifications:
Lath shall be stiffened continuously and parallel to the long
UU-B-790 Building Paper, Vegetable Fiber: (Kraft, Water-
dimension of the lath at intervals of not more than 6 in. (152
proofed, Water Repellent and Fire Resistant)
mm) with wire not less than 0.0720 in. (1.829 mm) in diameter.
3. Terminology 5.1.2 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
3.1 Definitions of terms used in this standard shall be in
lath.
accordance with Terminology C 11.
5.2 Thickness—The nominal thickness shall be ⁄8 in. (3.2
4. Materials and Manufacture
mm), exclusive of self-furring crimps, with a permissible
variation of 6 ⁄32 in. (0.8 mm).
4.1 Welded wire lath shall be fabricated from not less than
5.3 Width—The nominal width shall be 28 in. (710 mm) or
0.0625 in. (1.588 mm), cold-drawn, galvanized steel wire,
38 in. (965 mm), with a permissible variation of 6 ⁄4 in. (19
conforming to Specification A 641.
mm).
4.1.1 The wire shall be zinc-coated (galvanized) in accor-
5.4 Length—The nominal length shall be 96 in. (2440 mm)
dance with Specification A 390, Class 1.
or 104 in. (2640 mm) with a permissible variation of 6 ⁄4 in.
4.1.2 The backing shall be paper or felt, conforming to
(19 mm).
Federal Specification UU-B-790. The backing shall be either
5.5 Weight—The nominal weight, exclusive of backing,
2 2
shall be from 1.14 to 1.83 lb/yd (0.618 to 0.993 kg/m ).
This specification is under the jurisdiction of ASTM Committee C11 on
Permissible variation in percentage over and under the nominal
Gypsum and Related Building Materials and Systems and is the direct responsibility
weights shall be in accordance with mill tolerances.
of Subcommittee C11.02 on Specifications and Test Methods for Accessories
...