While preparing the subcontractor quantity check for the urgent-care ambulance canopy, the acoustical underlayment patch measures 4411 SF before a 6% waste allowance. Each underlayment roll covers 150 SF. How many rolls should be ordered?
Correct Answer
B) 32 rolls
Order quantity equals area times waste factor divided by 150 SF coverage, rounded up.
Why This Is the Correct Answer
Order quantity equals area times waste factor divided by 150 SF coverage, rounded up.
Why the Other Options Are Wrong
Option A: 29 rolls
29 rolls is below the supported result for floor sound mat; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 33 rolls
33 rolls is above the supported result for floor sound mat; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 35 rolls
35 rolls is above the supported result for floor sound mat; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Estimator Checks takeoff: count the condition before counting the package Tie the cue to Floor Sound Mat Estimator.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Interior finishes; underlayment coverage and waste; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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