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CSLB C-39 Roofing Contractor practice questions

207 free questions with answers and explanations.

Practice test
  1. 201.A contractor is preparing an estimate for a roof with a flat plan (footprint) area of 3,200 square feet and a slope of 7:12. What is the approximate actual surface area of the roof, considering the slope?Estimating and Planning
  2. 202.A contractor is planning a roofing project for a commercial building with a total roof deck area of 8,500 square feet. The specification calls for a three-ply asphalt and felt built-up roofing system. How many squares of felt underlayment will be needed, assuming no waste factor and standard 36-inch wide rolls?Estimating and Planning
  3. 203.A commercial building has an attic space of 2,000 square feet. According to California Building Code (CBC) Section 1203.2, if no vapor retarder is installed, the ratio of net free ventilation area (NFVA) to attic floor area must be at least 1:150. What is the minimum required total net free ventilation area for this attic?Estimating and Planning
  4. 204.A roofing contractor is estimating materials for a low-slope commercial roof measuring 6,500 square feet. The plan calls for a modified bitumen roof system with a granular cap sheet that comes in rolls covering 100 square feet each, and a 4-inch side lap and 6-inch end lap for each roll. Assuming a 10% waste factor, how many rolls of cap sheet should be ordered?Estimating and Planning
  5. 205.A roofing crew is installing clay tiles on a roof that has a slope length of 28 feet from eave to ridge. The tile manufacturer specifies a 12-inch headlap and an average exposure of 10 inches per tile course. How many tile courses will be required for this slope length?Estimating and Planning
  6. 206.A roofing contractor is performing a reroofing project on a commercial building with a low-slope roof. During the tear-off, they discover that the existing insulation is saturated with water over a significant area. What is the most appropriate action the contractor should take regarding the saturated insulation?Safety and Repair
  7. 207.A roofing contractor is installing a new asphalt shingle roof on a residential property. The roof has a 6:12 slope. According to standard practice, what is the minimum required headlap for these asphalt shingles?Steep-Slope Roofing