C-39 ROOFING TRADE TEST 1 AND TEST 2 ALL QUESTIONS AND ANSWERS VERSIONS 2026

C-39 ROOFING TRADE TEST 1 AND TEST 2 ALL QUESTIONS
AND ANSWERS
VERSIONS 2026


C-39 ROOFING TRADE TEST 1
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. ---------CORRECT 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. ---------
CORRECT ANSWER-----------------Attached with annular-threaded nails



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



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



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

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



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



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



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



If final surfacing is not installed, roofing felts installed should be: ----
-----CORRECT ANSWER-----------------"Glazed" and sealed at the end of
each days work



The bending radius of compositional roofing materials is generally limited
to: ---------CORRECT ANSWER-----------------45 degrees



To allow for the bending radius of compositional roofing materials, all
vertical surfaces must have: ---------CORRECT ANSWER-----------------Can't
strips between the roof and the vertical surface

, Pad-type compositional walk pads should be spaced no closer than: ---------
CORRECT ANSWER-----------------6 inches



For application between membrane plies, bitumen should be applied at a
rate of approximately _______ per 100 sq ft. ---------CORRECT ANSWER--
---------------15 to 35 pounds



What is the lowest slope allowed for a wood shake roof with 2 layers of 15
lb felt? ---------CORRECT ANSWER-----------------3:12



The proper nailing of three-tab asphalt shingles is: ---------CORRECT
ANSWER-----------------1" from the sides and 5/8" above the slots



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

Nails driven theough tin disks



Pitch pockets or pitch boxes: ---------CORRECT 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? ---------CORRECT ANSWER-----------------
Some moisture will remain in concrete decks even after the surface is dry