At the community-pool bathhouse, during the crew-release check, the slab-on-grade footprint for vapor retarder covers 14050 SF, with 12% added for laps and cuts. Each roll covers 1000 SF. How many rolls are needed?
Correct Answer
C) 16 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: 14 rolls
14 rolls is below the supported result for vapor retarder; it likely omits allowance, conversion, coverage, or final round-up.
Option B: 17 rolls
17 rolls is above the supported result for vapor retarder; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 15 rolls
15 rolls is below the supported result for vapor retarder; 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 Moisture protection; roll coverage estimating; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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