Figure 3-9.Expanded or diamond mesh steel reinforcement.
fabric, referred to as WWF within the NCF, has
various uses in reinforced concrete construction. In
building construction, it is most often used for floor
slabs on well-compacted ground. Heavier fabric,
supplied mainly in flat sheets, is often used in walls
and for the primary reinforcement in structural floor
slabs. Additional examples of its use include road and
runway pavements, box culverts, and small canal
Four numbers are used to designate the style of
wire mesh; for example, 6 by 6- 8 by 8 (sometimes
written 6 x 6 x 8 x 8 or 6 x 6 - W 2.1 x W 2.1). The
first number (in this case, 6) indicates the lengthwise
spacing of the wire in inches; the second number (in
this case, 6) indicates the crosswise spacing of the wire
in inches; the last two numbers (8 by 8) indicate the
size of the wire on the Washburn and Moen gauge.
More recently the last two numbers are a W number
that indicates the size of the cross-sectional area in the
wire in hundredths of an inch. (See table 3-9.) WWF
is currently available within the Navy stock system
using the four-digit system, 6 by 6 - 8 by 8, as of this
writing, but if procured through civilian sources, the
W system is used.
Light fabric can be supplied in either rolls or flat
sheets. Fabric made of wire heavier than W4 should
always be furnished in flat sheets. Where WWF must
be uniformly flat when placed, fabric furnished in rolls
should not be fabricated of wire heavier than W 2.9.
Fabricators furnish rolled fabric incomplete rolls only.
Stock rolls will contain between 700 to 1,500 square
feet of fabric determined by the fabric and the
producing location. The unit weight of WWF is
Table 3-9.Common Stock Sizes of Welded Wire Fabric