At the retail demising-wall phase, during the material-order review, the parapet return face measures 4062 SF before a 7% waste allowance. Each sheathing sheet covers 40 SF. How many sheets should be ordered?
Correct Answer
D) 109 sheets
Order quantity equals area times waste factor divided by 40 SF coverage, rounded up.
Why This Is the Correct Answer
Order quantity equals area times waste factor divided by 40 SF coverage, rounded up.
Why the Other Options Are Wrong
Option A: 102 sheets
102 sheets is below the supported result for exterior gypsum sheathing; it likely omits allowance, conversion, coverage, or final round-up.
Option B: 114 sheets
114 sheets is above the supported result for exterior gypsum sheathing; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option C: 112 sheets
112 sheets is above the supported result for exterior gypsum sheathing; 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 Exterior wall assemblies; sheathing quantity takeoff; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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