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C-39 ROOFING TRADE EXAM VERSION 3 NEWEST 2025/2026
ACTUAL EXAM WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR VERIFIED||
The maximum allowable deck deflection for a 6-ft span under a
concentrated load of 300 lb is: - ANSWER-0.30 inches
Roof deflection is important for proper roof drainage. It should be
limited to no more than ________ of the roof span. - ANSWER-
1/240
A deck span of 50 ft should deflect no more than: - ANSWER-3"
A deck span of 75 ft should deflect no more than: - ANSWER-3-
3/4"
Drains on roof surfaces should be located: - ANSWER-At points
of maximum deflection (e.g ., at midspan)
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Expansion joints are required and should always be provided: -
ANSWER-Where steel framing, structural steel, or decking
changes direction and
Where the type of decking changes and
Where additions are connected to existing building
Maintaining a roughly level line between a drain above a rigid roof
support (e.g. a column) and a 2-1/2" midspan deflection requires
raising the other roof support: - ANSWER-5"
Area dividers for attached membrane systems are generally
required at intervals of: - ANSWER-150-200 ft
Composition base flashing should extend at least _______
(nominal) above the roof line. - ANSWER-8"
Good practice requires that _______ be placed around all roof
penetrations. - ANSWER-Curbs
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The upper layer of roof insulation should be installed with
_______ dimension of the insulation boards placed in a
continuous line and the end joints _______. - ANSWER-The long
... staggered
When installing preformed roof insulation over steel decks, the
second layer should be attached with: - ANSWER-Hot asphalt
Which of the following statement is correct regarding preformed
roof insulation? - ANSWER-The upper layer should have a
greater insulation value
A bituminous-membrane vapor retarder is typically installed as: -
ANSWER-A two-ply installation with three moppings of Steep
asphalt
Bituminous-membrane vapor-retarder systems are typically rated
at _______ of permeability. - ANSWER-Less than 0.005 perm
C-39 ROOFING TRADE EXAM VERSION 3 NEWEST 2025/2026
ACTUAL EXAM WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR VERIFIED||
The maximum allowable deck deflection for a 6-ft span under a
concentrated load of 300 lb is: - ANSWER-0.30 inches
Roof deflection is important for proper roof drainage. It should be
limited to no more than ________ of the roof span. - ANSWER-
1/240
A deck span of 50 ft should deflect no more than: - ANSWER-3"
A deck span of 75 ft should deflect no more than: - ANSWER-3-
3/4"
Drains on roof surfaces should be located: - ANSWER-At points
of maximum deflection (e.g ., at midspan)
,2|Page
Expansion joints are required and should always be provided: -
ANSWER-Where steel framing, structural steel, or decking
changes direction and
Where the type of decking changes and
Where additions are connected to existing building
Maintaining a roughly level line between a drain above a rigid roof
support (e.g. a column) and a 2-1/2" midspan deflection requires
raising the other roof support: - ANSWER-5"
Area dividers for attached membrane systems are generally
required at intervals of: - ANSWER-150-200 ft
Composition base flashing should extend at least _______
(nominal) above the roof line. - ANSWER-8"
Good practice requires that _______ be placed around all roof
penetrations. - ANSWER-Curbs
, 3|Page
The upper layer of roof insulation should be installed with
_______ dimension of the insulation boards placed in a
continuous line and the end joints _______. - ANSWER-The long
... staggered
When installing preformed roof insulation over steel decks, the
second layer should be attached with: - ANSWER-Hot asphalt
Which of the following statement is correct regarding preformed
roof insulation? - ANSWER-The upper layer should have a
greater insulation value
A bituminous-membrane vapor retarder is typically installed as: -
ANSWER-A two-ply installation with three moppings of Steep
asphalt
Bituminous-membrane vapor-retarder systems are typically rated
at _______ of permeability. - ANSWER-Less than 0.005 perm
