Core TradesQuestion 173 of 700
A concrete foundation wall is 8 ft tall, 40 ft long, and 8 inches thick. Approximately how many cubic yards of concrete are needed (no waste allowance)?
a.4.7 cubic yards
b.6.3 cubic yards
c.7.9 cubic yards
d.9.5 cubic yards
Explanation
Volume = 8 x 40 x (8/12) = 213.3 cubic feet; 213.3 / 27 = about 7.9 cubic yards. The lower answers understate wall thickness or length, and 9.5 overstates the thickness.
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