A Florida bid drawing shows 18,500 sf of low-slope roof membrane. The estimator carries 9% waste for laps and cuts. How many square feet should be included?
Correct Answer
A) 20,165 sf
Waste is applied to the measured membrane area.
Why This Is the Correct Answer
Waste is applied to the measured membrane area.
Why the Other Options Are Wrong
Option B: 18,500 sf
18,500 sf is below the supported result for roof membrane takeoff; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 19,665 sf
19,665 sf is below the supported result for roof membrane takeoff; it likely omits allowance, conversion, coverage, or final round-up.
Option D: 21,350 sf
21,350 sf is above the supported result for roof membrane takeoff; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Roof Membrane Takeoff cart for Pricing Low-Slope: waste first, applied second, whole sf last.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 11th Edition, 2024 to Estimating and quantity takeoff; roofing membrane waste factor; match the project role and timing before choosing.
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