The actual grade is NOT given, NOR is the species
group. The index numbers 48/24 and 32/ 16 give
the maximum spacing in inches of supports. The
number to the left of the slash is the maximum
O.C. (on-center) spacing of supports for roof
decking. The number to the right of the slash is
the maximum O.C. spacing of supports for
subfloors. A number 0 on the right of the slash
indicates that the panel should NOT be used for
subflooring. No reference to the index number is
needed when the panel is to be used for wall
sheathing.
Detailed information on specific types and
grades and their uses can be found in commercial
standards for the manufacture of plywoods
established by the U.S. Department of Commerce.
General plywood characteristics and architectural
information can be found in the following
publications: American Plywood Association,
National Lumber Manufacturing Association, or
the Architectural Graphic Standards. The latter
book can be found in your unit’s technical library.
SPECIAL-PURPOSE PLYWOOD
Other types of plywood are manufactured for
specific purposes. Among these types are the
structural, sheathing, overlaid panels, decorative
panels, and concrete form panels. Table 6-3 lists
some of the various types of plywood with their
suggested uses.
Structural plywood is recommended for
heavy-load application where strength properties
are of great importance. Likewise, for box beams,
gusset plates, and stressed-skin panels, unsanded
grades of C-D plywood are recommended.
Standard plywood sheathing is used
subfloors, roof decks, and wall sheathing.
Table 6-3.-Uses of Plywood
for
It is
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