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30 questions from the contractor business and law practice test.
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10 questions, graded as you go, with the reason for every answer. No sign-up.
How many cubic yards of concrete are needed for a slab 40 ft long, 30 ft wide and 6 in. thick? Do not add waste.
Answer in cubic yards.
22.22 cubic yards
Thickness = 6 in. = 0.5 ft. Volume = 40 x 30 x 0.5 = 600 cu ft. 600 / 27 = 22.22 cu yd.
Reference: Estimating principles: volume takeoff, 27 cu ft per cu yd
A continuous footing is 2 ft wide, 1 ft deep and 180 ft long. With a 5% waste allowance, how many cubic yards of concrete should be ordered?
Answer in cubic yards.
14 cubic yards
Volume = 2 x 1 x 180 = 360 cu ft. 360 / 27 = 13.33 cu yd. With waste: 13.33 x 1.05 = 14.0 cu yd.
Reference: Estimating principles: volume takeoff with waste factor
A room is 20 ft by 15 ft with 8 ft walls. Ignoring openings, how many 4 ft x 8 ft drywall sheets are needed for the walls only, allowing 10% waste? Round up to a whole sheet.
Answer in sheets.
20 sheets
Perimeter = 2 x (20 + 15) = 70 ft. Wall area = 70 x 8 = 560 sq ft. Sheet = 4 x 8 = 32 sq ft. 560 / 32 = 17.5 sheets. With waste: 17.5 x 1.10 = 19.25, round up to 20 sheets.
Reference: Estimating principles: wall area takeoff and waste