Figure 6-21.Rabbet-and-groove-jointed treads and risers.
Treads and risers should be nailed to stringers with
6d, 8d, or 10d finish nails, depending on the thickness
of the stock,
LEARNING OBJECTIVE: Upon completing
this section, you should be able to describe the
procedures for laying out and installing
interior dooframes, doors, and the hardware
Rough openings for interior doors are usually
framed to be 3 inches higher than the door height and
2 1/2 inches wider than the door width. This provides
for the frame and its plumbing and leveling in the
opening. Interior doorframes are made up of two side
jambs, a head jamb, and the stop moldings upon which
the door closes. The most common of these jambs is the
one-piece type (shown in fig. 6-23, view A). Jambs can
be obtained in standard 5 1/4 inch widths for plaster
walls and 4 5/8 inch widths for walls with 1/2-inch
drywall finish. The two- and three-piece adjustable
jambs (views B and C) are also standard types. Their
principal advantage is in being adaptable to a variety of
Some manufacturers produce interior doorframes
with the doors fitted and prehung, ready for installing.
Installation of the casing completes the job. When used
with two- or three-piece jambs, casings can even be
installed at the factory.
Figure 6-22.Joining a baluster to the tread.
finish stringers (see fig. 6-20). Treads and risers are
often rabbet-jointed as in figure 6-21.
Vertical members that support a stairway handrail
are called balusters. Figure 6-22 shows a method of
joining balusters to treads. Here, dowels, shaped on the
lower ends of the balusters, are glued into holes bored
in the treads.
Stringers should be toenailed to stairwell double
headers with 10d nails, three to each side of the stringer.
Those which face against trimmer joists should each be
nailed to the joists with at least three 16d nails. At the
bottom, a stringer should be toenailed with 10d nails,
four to each side, driven into the subflooring and, if
possible, into a joist below.
Figure 6-23.Interior door framing parts.