During the material-order review at the maintenance-shop wash bay, the cricket infill zone measures 6669 SF before a 9% waste allowance. Each insulation board covers 32 SF. How many boards should be ordered?
Correct Answer
A) 228 boards
Order quantity equals area times waste factor divided by 32 SF coverage, rounded up.
Why This Is the Correct Answer
Order quantity equals area times waste factor divided by 32 SF coverage, rounded up.
Why the Other Options Are Wrong
Option B: 208 boards
208 boards is below the supported result for roof tapered insulation boards; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 238 boards
238 boards is above the supported result for roof tapered insulation boards; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 229 boards
229 boards is above the supported result for roof tapered insulation boards; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Measure to area, adjust for times, then let Estimator Checks set the finish line.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Roofing systems; board coverage and waste allowance; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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