Planning & EstimatingQuestion 532 of 700
A room is 12 ft by 20 ft with 8 ft ceilings. You will hang 4 ft by 8 ft gypsum board on all four walls and the ceiling, ignoring openings and waste. What is the MINIMUM number of full sheets needed?
a.16 sheets
b.20 sheets
c.24 sheets
d.30 sheets
Explanation
Each sheet covers 4 x 8 = 32 sq ft. Wall perimeter = (12 + 20) x 2 = 64 ft; wall area = 64 x 8 = 512 sq ft. Ceiling = 12 x 20 = 240 sq ft. Total = 752 sq ft. 752 / 32 = 23.5, round up to 24. Option a counts only the walls (512 / 32 = 16). Option b and d miscount. Include ceiling area and round partial sheets up.
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