C-39 Roofing Trade Practice Test 1 Practice
questions for the CSLB C-39 Roofing Exam
Questions With Complete Solutions
Composition flashing (base flashing) should be fastened with: ✔✔ One- inch solid cap-head nails or
Nails driven theough tin disks
Pitch pockets or pitch boxes: ✔✔ Are not recommended because they require extensive maintenance
Reinforced concrete can be used as a structural deck. Which of the following is a correct statement? ✔✔ Some moisture will remain in concrete decks even after the surface is dry
Roofing insulation and membranes must be protected from latent moisture in concrete decks. In northern climates, this is usually accomplished with: ✔✔ A vapor retarder or
A venting sheet
Steel decks should be at least _______ or heavier. ✔✔ 22g
Insulation applied to steel roof decks before the roof membrane is installed should be applied: ✔✔ In two separate layers where insulation thickness permits
The top flanges of a steel roof deck should be installed: ✔✔ Perpendicular to the roof slope The maximum deflection allowed for a steel deck is: ✔✔ 1/4" per 100 feet
If the steel decks must be spot-welded to structural steel, puddle welds _______ or larger in diameter are recommended. They should be made on washers and spaced at least _______ on center. ✔✔ 1/2 inches ... 12 inches
If thermosetting insulation is used over structural decks, the density should be: ✔✔ 18 to 22 pounds per cubic foot
The correct density for thermosetting insulation is accomplished by: ✔✔ Compacting
Thermosetting insulation is compacted in two layers if the total thickness is greater than: ✔✔ 6 inches
Thermosetting insulative fills must be protected from latent moisture in roof decks. Which of the following procedures is recommended? ✔✔ Install base-ply vapor barrier and
Install wood nailers at all perimeters and
Install wood nailers at all roof projections
What type of roof is recommended over thermosetting insulative
fills ✔✔ Aggregate
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