C-39 Roofing Trade Exam Version 1 Newest 2025/2026 Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+||Brand New Version!!
Composition flashing (base flashing) should be fastened with: - (ANSWER)One- inch solid cap-head nails
or
Nails driven theough tin disks
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
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
The top flanges of a steel roof deck should be installed: - (ANSWER)Perpendicular to the roof slope
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
If thermosetting insulation is used over structural decks, the density should be: - (ANSWER)18 to 22
pounds per cubic foot
, C-39 Roofing Trade Exam Version 1 Newest 2025/2026 Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+||Brand New Version!!
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 - (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 sub flooring 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 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 membranes is provided by the: - (ANSWER)National
Bureau of Standards
On low-sloped roofs, felt should be laid _______ the flow of water, beginning at _______ points in the
deck. - (ANSWER)Perpendicular ... low
Answers (Verified Answers) |Already Graded A+||Brand New Version!!
Composition flashing (base flashing) should be fastened with: - (ANSWER)One- inch solid cap-head nails
or
Nails driven theough tin disks
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
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
The top flanges of a steel roof deck should be installed: - (ANSWER)Perpendicular to the roof slope
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
If thermosetting insulation is used over structural decks, the density should be: - (ANSWER)18 to 22
pounds per cubic foot
, C-39 Roofing Trade Exam Version 1 Newest 2025/2026 Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+||Brand New Version!!
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 - (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 sub flooring 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 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 membranes is provided by the: - (ANSWER)National
Bureau of Standards
On low-sloped roofs, felt should be laid _______ the flow of water, beginning at _______ points in the
deck. - (ANSWER)Perpendicular ... low
