During the subcontractor quantity check at the hospital dietary expansion, the wall backup area for air-barrier sheet covers 19300 SF, with 5% added for laps and cuts. Each roll covers 500 SF. How many rolls are needed?
Correct Answer
A) 41 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 B: 39 rolls
39 rolls is below the supported result for air-barrier sheet; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 43 rolls
43 rolls is above the supported result for air-barrier sheet; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 40 rolls
40 rolls is below the supported result for air-barrier sheet; 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 Air barriers; sheet roll coverage; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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