While preparing the subcontractor quantity check for the bank drive-through canopy, the upper-floor unit area for sound-control mat covers 37050 SF, with 8% added for laps and cuts. Each roll covers 600 SF. How many rolls are needed?
Correct Answer
B) 67 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: 62 rolls
62 rolls is below the supported result for sound-control mat; it likely uses the wrong base, period, or account bucket.
Option C: 70 rolls
70 rolls is above the supported result for sound-control mat; it likely adds an unsupported amount or compares the wrong financial base.
Option D: 66 rolls
66 rolls is below the supported result for sound-control mat; it likely uses the wrong base, period, or account bucket.
Memory Technique
Roll and count live in different drawers; Estimator Checks tells which opens.
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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