A foundation plan is a plane view of a structure.
That is, it looks as if it were projected onto a
horizontal plane and passed through the structure. In
the case of the foundation plan, the plane is slightly
below the level of the top of the foundation wall. The
plan in figure 2-10 shows that the main foundation
consists of 12-inch and 8-inch concrete masonry unit
(CMU) walls measuring 28 feet lengthwise and 22
feet crosswise. The lower portion of each lengthwise
section of wall is to be 12 inches thick to provide a
concrete ledge 4 inches wide.
A girder running through the center of the
building will be supported at the ends by two
4-by- 12-inch concrete pilasters butting against the
end foundation walls. Intermediate support for the
girder will be provided by two 12-by-12-inch
concrete piers, each supported on 18-by- 18-inch
spread footings, which are 10 inches deep. The dotted
lines around the foundation walls indicate that these
walls will also rest on spread footings.
Figure 2-11 shows the way a floor plan is
developed: from elevation, to cutting plane, to floor
plan. An architectural or structural floor plan shows
the structural characteristics of the building at the
level of the plane of projection. A mechanical floor
plan shows the plumbing and heating systems and any
other mechanical components other than those that
An electrical floor plan shows the
lighting system and any other electrical systems.
Figure 2-12 is a floor plan showing the lengths,
thicknesses, and character of the outside walls and
Figure 2-10.Foundation plan.