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33 questions from the roofing contractor practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
A gable roof has two identical rectangular planes. Each plane is 40 ft long at the eave and measures 16 ft from eave to ridge along the slope. What is the total roof area in squares?
Answer in squares.
12.8 squares
Area of one plane = 40 x 16 = 640 sq ft. Two planes = 1,280 sq ft. 1,280 / 100 = 12.8 squares.
Reference: Roofing estimating: area of rectangular roof planes
A gable roof covers a plan (footprint) area of 30 ft by 50 ft, overhangs included. The slope is 6:12 (slope factor 1.118). What is the actual roof surface area?
Answer in sq ft.
1677 sq ft
Plan area = 30 x 50 = 1,500 sq ft. Roof area = 1,500 x 1.118 = 1,677 sq ft.
Reference: Roof area estimating: plan area x slope factor
A house is 28 ft by 44 ft with a 1 ft overhang on all four sides. The gable roof has an 8:12 slope (slope factor 1.202). How many squares is the roof?
Answer in squares.
16.59 squares
Plan dimensions with overhang = (28 + 2) x (44 + 2) = 30 x 46 = 1,380 sq ft. Roof area = 1,380 x 1.202 = 1,658.8 sq ft. 1,658.8 / 100 = 16.59 squares.
Reference: Roof area estimating: plan area x slope factor