During the next-week procurement cycle at the warehouse fire-pump room, the subgrade stabilization area for geotextile fabric covers 31300 SF, with 5% added for laps and cuts. Each roll covers 1350 SF. How many rolls are needed?
Correct Answer
C) 25 rolls
Roll count equals adjusted area divided by roll coverage, rounded up.
Why This Is the Correct Answer
Roll count equals adjusted area divided by roll coverage, rounded up.
Why the Other Options Are Wrong
Option A: 23 rolls
23 rolls is below the supported result for geotextile fabric; it likely omits allowance, conversion, coverage, or final round-up.
Option B: 26 rolls
26 rolls is above the supported result for geotextile fabric; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 24 rolls
24 rolls is below the supported result for geotextile fabric; it likely omits allowance, conversion, coverage, or final round-up.
Memory Technique
Measure to roll, adjust for count, then let Estimator Checks set the finish line.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Earthwork; geotextile roll coverage; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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