C-39 Roofing Trade Practice Test 1, 2 & 3 ALL 400 QUESTIONS AND CORRECT ANSWERS LATEST UPDATE THIS YEAR

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C-39 Roofing Trade Practice Test 1, 2 & 3 ALL 400
QUESTIONS AND CORRECT ANSWERS LATEST UPDATE
THIS YEAR


C-39 Roofing Trade Practice Test 1

QUESTION: A span rating of _______ means that a plywood panel may be used for roof decking
over supports spaced 32 inches o.c. or for sub flooring over supports spaced 16 inches o.c. -
ANSWER-32/16




QUESTION: On plywood decks not covered with insulation, a base ply should be _______ to
serve as as the base ply of the roof membrane. - ANSWER-Attached with annular-threaded nails




QUESTION: The choice of membrane type for a roof is frequently determined by: - ANSWER-
Geographical location and




Climate




QUESTION: Technical information useful in the selection of roof membranes is provided by the:
- ANSWER-National Bureau of Standards




ALL THE BEST CHAMP!!
1

,Page 2 of 47


QUESTION: On low-sloped roofs, felt should be laid _______ the flow of water, beginning at
_______ points in the deck. - ANSWER-Perpendicular ... low




QUESTION: On slopes over 2 inches per foot, felt should be laid: - ANSWER-Parallel to the
slopes




QUESTION: For asphalt roofs, treated wood nailers should be installed perpendicular to the
slope and on 20 - foot centers for slopes up to: - ANSWER-3 inches per foot




QUESTION: A roofing contractor discovers damage done by other trades to a newly installed
roof. What should the roofing contractor do? - ANSWER-Submit a written report to the general
contractor and/or the owner for any visible damage




QUESTION: When layers of felt are joined by hot-mopping, the process is most similar to: -
ANSWER-Welding




Q; Composition flashing (base flashing) should be fastened with: - ANSWER-One- inch solid cap-
head nails or




Nails driven theough tin disks




ALL THE BEST CHAMP!!
2

,Page 3 of 47


QUESTION: Pitch pockets or pitch boxes: - ANSWER-Are not recommended because they
require extensive maintenance




QUESTION: 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




QUESTION: 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




QUESTION: Steel decks should be at least _______ or heavier. - ANSWER-22g




QUESTION: Insulation applied to steel roof decks before the roof membrane is installed should
be applied: - ANSWER-In two separate layers where insulation thickness permits




QUESTION: The top flanges of a steel roof deck should be installed: - ANSWER-Perpendicular to
the roof slope




QUESTION: The maximum deflection allowed for a steel deck is: - ANSWER-1/4" per 100 feet
ALL THE BEST CHAMP!!
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, Page 4 of 47




QUESTION: 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




QUESTION: If thermosetting insulation is used over structural decks, the density should be: -
ANSWER-18 to 22 pounds per cubic foot




QUESTION: The correct density for thermosetting insulation is accomplished by: - ANSWER-
Compacting




QUESTION: Thermosetting insulation is compacted in two layers if the total thickness is greater
than: - ANSWER-6 inches




QUESTION: 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



ALL THE BEST CHAMP!!
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