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17 questions from the roofing contractor practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
A symmetrical gable roof has a 6:12 slope. Expressed as a pitch (rise divided by span), the roof is:
A. 1/4 pitch
Pitch is total rise over total span. With 6 in. of rise per 12 in. of run, the span is twice the run, so pitch is 6/24 = 1/4. Using run instead of span gives 1/2, which is the common error.
Reference: Roof framing math: pitch = rise / span
A roof with two different slopes on each of two sides, the lower slope steeper than the upper, is a:
B. gambrel roof
A gambrel (the classic barn roof) has a double slope on two sides with gable ends. A mansard also has a double slope but on all four sides, which is the usual confusion.
Reference: Roofing terminology (NRCA Roofing Manual glossary)
The part of a shingle that is left uncovered by the course above and is open to the weather is the:
A. exposure
Exposure is the visible, weather-facing part of each course. Headlap is the hidden overlap that gives double or triple coverage, and selvage is the unsurfaced part of roll roofing meant to be covered.
Reference: Roofing terminology (NRCA Roofing Manual glossary)