C-39 Roofing Trade Practice Test 1 Final Exam
2024- 2025 Questions And
Answers correctly Arranged And Graded
A+
Roofing insulation and membranes must be protected
from latent moisture in concrete decks. In northern
climates, this is usually accomplished with: -
✔ANASWER✔-A vapor retarder or
A venting sheet
Steel decks should be at least _______ or heavier. -
✔ANASWER✔-22g
,Insulation applied to steel roof decks before the roof
membrane is installed should be applied: -
✔ANASWER✔-In two separate layers where insulation
thickness permits
The top flanges of a steel roof deck should be installed: -
✔ANASWER✔-Perpendicular to the roof slope
The maximum deflection allowed for a steel deck is: -
✔ANASWER✔-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. - ✔ANASWER✔-1/2
inches ... 12 inches
If thermosetting insulation is used over structural decks,
the density should be: - ✔ANASWER✔-18 to 22 pounds
per cubic foot
The correct density for thermosetting insulation is
accomplished by: - ✔ANASWER✔-Compacting
, Thermosetting insulation is compacted in two layers if the
total thickness is greater than: - ✔ANASWER✔-6 inches
Thermosetting insulative fills must be protected from latent
moisture in roof decks. Which of the following procedures
is recommended? - ✔ANASWER✔-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 - ✔ANASWER✔-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. - ✔ANASWER✔-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. - ✔ANASWER✔-Attached with annular-
threaded nails
2024- 2025 Questions And
Answers correctly Arranged And Graded
A+
Roofing insulation and membranes must be protected
from latent moisture in concrete decks. In northern
climates, this is usually accomplished with: -
✔ANASWER✔-A vapor retarder or
A venting sheet
Steel decks should be at least _______ or heavier. -
✔ANASWER✔-22g
,Insulation applied to steel roof decks before the roof
membrane is installed should be applied: -
✔ANASWER✔-In two separate layers where insulation
thickness permits
The top flanges of a steel roof deck should be installed: -
✔ANASWER✔-Perpendicular to the roof slope
The maximum deflection allowed for a steel deck is: -
✔ANASWER✔-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. - ✔ANASWER✔-1/2
inches ... 12 inches
If thermosetting insulation is used over structural decks,
the density should be: - ✔ANASWER✔-18 to 22 pounds
per cubic foot
The correct density for thermosetting insulation is
accomplished by: - ✔ANASWER✔-Compacting
, Thermosetting insulation is compacted in two layers if the
total thickness is greater than: - ✔ANASWER✔-6 inches
Thermosetting insulative fills must be protected from latent
moisture in roof decks. Which of the following procedures
is recommended? - ✔ANASWER✔-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 - ✔ANASWER✔-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. - ✔ANASWER✔-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. - ✔ANASWER✔-Attached with annular-
threaded nails
