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C-39 ROOFING TRADE TEST 1 AND TEST 2 | ALL
QUESTIONS AND CORRECT ANSWERS |
GRADED A+ | VERIFIED ANSWERS | LATEST
VERSIONS 2025
1. Composition flashing (base flashing) should be fastened with:
ANSWER: One-inch solid cap-head nails or nails driven
through tin disks
2. Pitch pockets or pitch boxes:
ANSWER: 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?
ANSWER: 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:
ANSWER: A vapor retarder or a venting sheet
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- Steel decks should be at least _______ or heavier.
ANSWER: 22g
- Insulation applied to steel roof decks before the roof
membrane is installed should be applied:
ANSWER: In two separate layers where insulation thickness
permits
7. The top flanges of a steel roof deck should be installed:
ANSWER: Perpendicular to the roof slope
8. The maximum deflection allowed for a steel deck is:
ANSWER: 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.
ANSWER: 1/2 inches ... 12 inches
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- If thermosetting insulation is used over structural decks, the
density should be:
ANSWER: 18 to 22 pounds per cubic foot
- The correct density for thermosetting insulation is
accomplished by:
ANSWER: Compacting
- Thermosetting insulation is compacted in two layers if the
total thickness is greater than:
ANSWER: 6 inches
- Thermosetting insulative fills must be protected from latent
moisture in roof decks. Which of the following procedures is recommended?
ANSWER: 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?
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ANSWER: Aggregate
- A span rating of _______ means that a plywood panel may
be used for roof decking over supports spaced 32 inches o.c. or for subflooring over supports spaced 16 inches o.c.
ANSWER: 32/16
- On plywood decks not covered with insulation, a base ply
should be _______ to serve as the base ply of the roof membrane.
ANSWER: Attached with annular-threaded nails
- The choice of membrane type for a roof is frequently
determined by:
ANSWER: Geographical location and climate
- Technical information useful in the selection of roof