Parapet coping is needed around a rectangular roof that is 180 ft by 96 ft. Two 12 ft equipment-screen gaps are excluded. What coping length is required before waste?
Correct Answer
B) 528 ft
The full perimeter is 2 x (180 + 96) = 552 ft. Two excluded 12 ft gaps remove 24 ft, leaving 552 - 24 = 528 ft. Other choices ignore the gaps, add them, or subtract too much.
Why This Is the Correct Answer
The full perimeter is 2 x (180 + 96) = 552 ft. Two excluded 12 ft gaps remove 24 ft, leaving 552 - 24 = 528 ft. Other choices ignore the gaps, add them, or subtract too much.
Why the Other Options Are Wrong
Option A: 552 ft
flashing length, choice a: the answer choice lifts 552 ft from the working line.
Option C: 576 ft
flashing length, choice b: 576 ft backs into 1.04 when divided by 552; the accepted setup gives 0.96 on that same base.
Option D: 504 ft
flashing length, choice c: 504 ft backs into 252 when divided by 2; the accepted setup gives 264 on that same base.
Memory Technique
Remember flashing length as "base, adjustment, final unit"; the last unit should read 528 ft.
Reference Hint
Open Roofing Construction and Estimating, Atcheson, 1995/2022 reprint; use the index entry or section for "Parapet coping and flashing length takeoff" to confirm that The full perimeter is 2 x (180 + 96) = 552 ft.
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