During the field-takeoff reconciliation at the laboratory exhaust chase, a isolated mat footing is 60 ft by 26 ft by 4 in. Including 7% waste, how many cubic yards of concrete are needed?
Correct Answer
B) 20.6 CY
Convert slab thickness from inches to feet, divide by 27 cubic feet per cubic yard, then add waste.
Why This Is the Correct Answer
Convert slab thickness from inches to feet, divide by 27 cubic feet per cubic yard, then add waste.
Why the Other Options Are Wrong
Option A: 19.3 CY
19.3 CY is below the supported result for canopy column mat; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 231.1 CY
231.1 CY is above the supported result for canopy column mat; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 23.1 CY
23.1 CY is above the supported result for canopy column mat; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Canopy Column Mat cart for Superintendent Validates: convert first, slab second, whole cy last.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Concrete foundations; mat footing quantity; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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