Figure 3-34.-Scarf joints.
Figure 3-35.-Laminated beam.
There are two basic types of plywood: exterior
and interior. Exterior plywood is bonded with
waterproof glues. It can be used for siding, concrete
forms, and other constructions where it will be
exposed to the weather or excessive moisture.
Interior plywood is bonded with glues that are not
waterproof. It is used for cabinets and other inside
construction where the moisture content of the panels
will not exceed 20 percent.
Figure 3-36.-Grain direction in a sheet of plywood.
Plywood is made in thicknesses of 1/8 inch to
more than 1 inch, with the common sizes being 1/4,
3/8, 1/2, 5/8, and 3/4 inch. A standard panel size is
4-feet wide by 8-feet long. Smaller size panels are
available in the hardwoods.