CHAPTER 1
LIGHT FLOOR AND WALL FRAMING
In the normal sequence of construction events, the
floor and wall activities follow the completed
foundation work. In this chapter, we’ll examine
established methods of frame construction and discuss
in general how floor and wall framing members are
assembled. An explanation of subflooring installation,
exterior sheathing, interior partitions, and rough
openings for doors and windows is also given.
WOOD SILL FRAMING
LEARNING OBJECTIVE: Upon completing
this section, you should be able to describe sill
layout and installation.
Framing of the structure begins after completion of
the foundation. The lowest member of the frame
structure resting on the foundation is the sill plate, often
called the mud sill. This sill provides a roiling base for
joists or studs resting directly over the foundation. Work
in this area is critical as it is the real point of departure
for actual building activities.
LAYOUT
The box sill is usually used in platform construction.
It consists of a sill plate and header joist anchored to the
foundation wall. Floor joists are supported and held in
position by the box sill (fig. 1-1). Insulation material and
metal termite shields are placed under the sill if desired
or when specified. Sills are usually single, but double
sills are sometimes used.
Following construction of the foundation wall, the
sill is normally the first member laid out. The edge of
the sill is setback from the outside face of the foundation
a distance equal to the thickness of the exterior
sheathing. When laying out sills, remember the comers
should be halved together, but are often butted or
mitered. If splicing is necessary to obtain required
Figure 1-1.—Box-sill assembly.
1-1
