At the school band-room storage, during the next-week procurement cycle, the upper-floor unit area for sound-control mat covers 21800 SF, with 5% added for laps and cuts. Each roll covers 600 SF. How many rolls are needed?
Correct Answer
B) 39 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: 36 rolls
36 rolls is below the supported result for sound-control mat; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 40 rolls
40 rolls is above the supported result for sound-control mat; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 38 rolls
38 rolls is below the supported result for sound-control mat; it likely omits allowance, conversion, coverage, or final round-up.
Memory Technique
Estimator Checks takeoff: count the condition before counting the package Tie the cue to Sound-Control Mat Estimator Checks.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Acoustical underlayment; roll coverage; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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