C-39 ROOFING TRADE TEST 5 NEWEST 2026 ACTUAL COMPLETE 100 REAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+.

C-39 ROOFING TRADE TEST 5 NEWEST 2026
ACTUAL COMPLETE 100 REAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A+.




Roofing insulation and membranes must be protected
from latent moisture in concrete decks. In northern
climates, this is usually
accomplished with:


ANSWERS: A


vapor retarder or


A venting sheet

Steel decks should be at least _ or heavier.


ANSWERS: 22g

,Insulation applied to steel roof decks before the roof
membrane is installed should be applied:


ANSWERS: In two separate layers where insulation thickness
permits

The top flanges of a steel roof deck should be installed:


ANSWERS: Perpendicular to the roof slope


The maximum deflection allowed for a steel deck is:


ANSWERS: 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.


ANSWERS: 1/2 inches ... 12 inches

If thermosetting insulation is used over structural decks, the
density should be:


ANSWERS: 18 to 22 pounds per cubic foot

, The correct density for thermosetting insulation is accomplished
by:


ANSWERS: Compacting

Thermosetting insulation is compacted in two layers if the total
thickness is greater than:


ANSWERS: 6 inches



Thermosetting insulative fills must be protected from latent
moisture in roof decks. Which of the following procedures is
recommended?

ANSWERS:
Install base-ply vapor barrier and


Install wood nailers at all perimeters


and Install wood nailers at all roof


projections