During the material-order review at the data-room equipment alcove, the slab-on-grade footprint for vapor retarder covers 44300 SF, with 8% added for laps and cuts. Each roll covers 1000 SF. How many rolls are needed?
Correct Answer
A) 48 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: 44 rolls
44 rolls is below the supported result for vapor retarder; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 51 rolls
51 rolls is above the supported result for vapor retarder; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 47 rolls
47 rolls is below the supported result for vapor retarder; it likely omits allowance, conversion, coverage, or final round-up.
Memory Technique
Vapor Retarder cart for Estimator Checks: roll first, count second, whole the controlling choice last.
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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