Figure 1-33.—Typical exterior wall.
These markings indicate the allowance spacing of
rafters and floor joists for the various thicknesses when
the plywood is used as roof sheathing or subfloor. For
example, an index mark of 32/16 indicates the plywood
panel is suitable for a maximum spacing of 32 inches
for rafters and 16 inches for floor joists. Thus, no
problem of strength differences between species is
involved, as the correct identification is shown for each
panel.
Plywood should be installed with the grain of the
outer plies at right angles to the joists. Panels should be
staggered so that end joints in adjacent panels break over
different joists. The nailing schedule for most types of
subfloor panels calls for 6d common nails for materials
up to 7/8 inch thick and for 8d nails for heavier panels
up to 1 1/8 inches thick. Deformed-shank nails are
strongly recommended. They are usually spaced 6
inches OC along the edges of the panel and 10 inches
OC over intermediate joists.
For the best performance, do not lay up plywood
with tight joints, whether interior or exterior. Allow for
expansion if moisture should enter the joints.
WALL FRAMING
LEARNING OBJECTIVE: Upon completing
this section, you should be able to identify wall
framing members and explain layout and
installation procedures for these members in
building construction.
Wall construction begins after the subfloor has been
nailed in place, The wall system of a wood-framed
buildlng consists of exterior (outside) and interior
(inside) walls. The typical exterior wall has door and
window openings, as shown in figure 1-33. Interior
walls, usually referred to as “partitions,” divide the
inside area into separate rooms. Some interior walls
have door openings or archways.
Partitions are either bearing or nonbearing. Bearing
partitions support the ends of the floor joists or ceiling
joists. Nonbearing partitions run in the same direction
as the joists and therefore carry little weight from the
floor or ceiling above.
Traditionally, 2-by 4-inch structural lumber is used
for the framed walls of one-story buildings, although the
use of heavier structural lumber is specified at certain
locations for particular projects. Multistory buildings,
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