TABLE 1-3. Contents of Lumber (Number of Board Feet in Various Sizes for Lengths Given)
according to use and form. The wire nail is round-
(3) Scaffold or form nails (3, fig. 1-
shafted, straight, pointed, and may vary in size,
14). The scaffold, form, or staging nail (as it is
weight, size and shape of head, type of point, and
sometimes called) is made with what may appear to
finish. All normal requirements of construction and
be two heads. The lower head, or shoulder, is
framing are filled by one of the nail types described
provided so that the nail may be driven securely
below. There are a few general rules to be followed
home to give maximum holding power while the
in the use of nails in carpentry. Nails should be
upper head projects above the surface of the wood to
driven at an angle slightly toward each other and
make its withdrawal simple. The reason for this
should be carefully placed to provide the greatest
design is that the scaffold nail is not meant to be
holding power. Nails driven with the grain do not
permanent.
It is used in the construction of
hold as well as nails driven across the grain. A few
temporary structures such as scaffolding and staging
nails of proper type and size, properly placed and
and is classified for temporary construction.
properly driven, will hold better than a great many
(4) Roofing nails (4, fig. 1-14).
driven close together. Nails can generally be
Roofing nails are round-shafted, diamond-pointed,
considered the cheapest and easiest fasteners to be
galvanized nails of relatively short length and
applied. In terms of holding power alone, nails
comparatively large heads. They are designed for
provide the least, screws of comparable size provide
fastening flexible roofing materials and for resisting
more, and bolts provide the greatest amount.
continuous exposure to weather. Several general
rules apply to the use of roofing nails, especially their
b. Types of nails.
use with asphalt shingles. If shingles or roll roofing
(1) Common wire nails. Common
is being
wire nails and box nails are similar except box nails
are sized smaller than common nail. The common
wire nail (1, fig. 1-14) is used for housing-
construction framing. The common wire nail and the
box nail are generally used for structural carpentry.
(2) Finishing nails (2, fig. 1-14). The
finishing nail is made from finer wire and has a
smaller head than the common nail. It may be set
below the surface of the wood into which it is driven
and will leave only a small hole, easily puttied up. It
Figure 1-14. Types of nails.
is generally used for interior or exterior finishing
work and is used for finished carpentry and cabinet
making.
1-20
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