Estimating in Building Construction

Excavation 79

EXAMPLE 9-10 PERIMETER CALCULATIONS

Perimeter 340 ¿

 15 ¿ 35 ¿ 30 ¿ 10 ¿ 30 ¿ 10 ¿ 40 ¿ 60 ¿

Perimeter 85 ¿ 25 ¿

FIGURE 9.24.Sample Perimeter and Area Calculation. 

EXAMPLE 9-11 BUILDING AREA

Find the area of the building shown in Figure 9.24. The area of the
building will be calculated by finding the area of the 100 60 rec-
tangle and by subtracting the recesses.

Basic area 100 60  6,000 sf
Bottom recess 10 30  300 sf
Top recess 15 25  375 sf

Net building area 5,325 sf 

9–8 Topsoil Removal

The removal of topsoil to a designated area where it is to
be stockpiled for finished grading and future use is
included in many specifications. Thus, the estimator must

EXAMPLE 9-12 TOPSOIL REMOVAL

Find the perimeter of the building shown in Figure 9.24, which is

excerpted from Appendix A. Starting in the upper left corner of the

building and proceeding clockwise,

determine the depth of the topsoil, where it will be stock-

piled, and what equipment should be used to strip the

topsoil and move it to the stockpile area. Topsoil is gener-

ally removed from all building, walk, roadway, and

parking areas. The volume of topsoil is figured in cubic

yards. A clearance around the entire basic plan must

also be left to allow for the slope required for the general

excavation; usually about 5 feet is allowed on each side

of a building and 1 to 2 feet for walks, roadways, and

parking areas.

In Figure 9.25, the “footprint” of the building has been enlarged by

5 feet to compensate for accuracy and slope. Assuming that the

topsoil to be removed is 9 inches thick, determine the quantity of

topsoil to be removed and stockpiled. 5,775 bcf> 27 cf per cy 214 bcy

Quantity of topsoil to be removed (bcy)

 110 ¿ 70 ¿0.75¿5,775 bcf

Quantity of topsoil to be removed (bcf)