Using a waste factor of 6 percent, determine the number of cubic yards of concrete needed to pour the foundation walls shown in Figures 11.38 and 11.39.
What will be an ideal response?
The wall lengths are shown in Figure 11-4.
Length of wall (lf) = 28? + 40? + 28? + 40? + 12? + 17? = 165?
Foundation wall concrete (cy) = 165? × 12? × 1? = 1,980 cf / 27 cf per cy = 73.33 cy
Add 6% waste and round off.
Foundation wall concrete (cy) = 73.33 cy × 1.06 = 77.73 cy – Use 77.75 cy
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