C-39 Roofing Trade Practice Test Questions with Correct Answers Latest Update 2025

C-39 Roofing Trade Practice Test Questions with Correct Answers Latest Update 2025 A roof is 80' x 64' and one pallet has 6.45 squares of material. How many pallets are needed? - Answers 8 pallets The size of a house with a flat roof is 25' x 28'. It has a garage with a flat roof of 15' x 18'. How much roofing do the both of them need? - Answers 10 squares A roof is 30' x 40'. If you need 1 square for the starter, 1 square for waste, and 1 2/3 square for hip and ridge, how much roofing material will you need? - Answers 16 squares Given that a sloped roof has an area of 1,160 sq ft. How many rolls of 15 pound felt (4 sq/roll) are needed to cover the roof with one layer? - Answers 3 Which statement is most correct? - Answers Tar is distilled from soft coal Given a scale 1/4" = 1' what is 3'-6" - Answers 7/8" Which of the following is the correct order for installing a tile roof? - Answers Lay underlayment; snap chalkline; load tile; install tile What is the purpose of a shake liner? - Answers To waterproof the roof Which of the following are you most likely to use when nailing composition roof shingles on a felted plywood deck? - Answers Coil nail gun Which of the following types of insulation cannot be used in direct contact with BUR? - Answers Polystyrene board How should you walk on a roof with flat concrete tiles? - Answers Step of the headlap of the tiles How would you load tile onto a roof? - Answers Load 6 tiles high and 3 ft from the edge The chalk line for installing tile should be set - Answers Perpendicular to the eave In a moderate climate with a normal slope, how far should back flashing go upside off a chimney? - Answers 18" Why should you not install composition single roofs when the temperature is 40* F or below? - Answers The shingles can crack too easily with handling and nailing What in the best way to prevent a leak behind a 36" wide masonry chimney? - Answers Install a cricket What is the best way to walk on spaced seating? - Answers Step on the 1" x 4" and on the rafters Composition flashing (base flashing) should be fastened with? - Answers One inch solid cap-head nails or nails driven through tin disks Reinforced concrete can be used as a structural deck. Which of the following is a correct statement? - Answers Some moisture will remain in concrete decks even after the surface is dry On plywood decks not covered with insulation, a base ply should be ____________ to serve as the base ply of the roof membrane. - Answers Attached with annular-threaded nails On slopes over 2 inches per foot, felt should be laid: - Answers Parallel to the slope A roofing contractor discovers damage done by other trades to a newly installed roof. What should the roofing contractor do? - Answers Submit a written report to the general contractor and/or owner for any visible damage When installing sheet-laying adhesives, the overlap should be: - Answers 10" When installing composition shingles on a roof with a slope of less than 3:12, a common practice is to: - Answers Use double layers of 15 lb felt for an underlayment