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 are electrical. 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.Continue Reading