Roofing
C-39 Roofing Trade Practice Test 2 Study
Guide Questions and Answers Graded A+
2025
An asphalt-modified roof is: -Correct Answer ✔Torch-applied
A roof has a 7' run and 8" per unit rise. What is the total rise at the ridge? -Correct
Answer ✔56"
Which of the following is NOT used as a weathering surface in single-ply roofing? -
Correct Answer ✔Mica
If you know the lengths of two sides of a right angle, can you figure the length of the
third side? -Correct Answer ✔Yes, the third side squared = a2 + b2
The maximum heating temperature for steep asphalt is: -Correct Answer ✔525*F
What is the flash point of a coal-tar pitch kettle? -Correct Answer ✔240-280*F
What is the name of the thick, black, gummy plastic used for making temporary repairs
to damp roof surfaces? -Correct Answer ✔Wetpatch
Where are sump drains usually installed? -Correct Answer ✔Wood decks
Which would be used to strengthen the eaves of a gable roof? -Correct Answer ✔Fascia
For spans less than 10ft, what is the minimum size lumber that may be used with a
roofing jack? -Correct Answer ✔2" x 6"
Cal/OSHA may impose _______ concerning machinery. -Correct Answer ✔Fines and/or
restraining orders
Trusses should be spaced _______ apart for tile roofs. -Correct Answer ✔2'-6"
Which of the following does not influence the exposure of wood shingles? -Correct
Answer ✔Type of sheathing
Which of the following is least hazardous to your health? -Correct Answer ✔Hypalon
What is NOT a requirement when you reroof over a built-up roof? -Correct Answer
✔The deck must be torn up
Roofing
, Roofing
Which of the following is not a correct statement about PVC sheet-laying adhesives? -
Correct Answer ✔The overlap should be 10"
The main purpose of a base sheet is to provide: -Correct Answer ✔A welding process
Why must kerosene kettles NOT burn at a low flame for a long time? -Correct Answer
✔Carbon will build up in the coils
What is the best protector of metal? -Correct Answer ✔Red lead primer
What is a common requirement of asbestos, asphalt shingle, and slate roofs? -Correct
Answer ✔Underlayment
What are rubber sheet, one-sided latex base, and Kraft paper used for? -Correct
Answer ✔Vapor barrier
When setting up a ladder, how many feet per rung away from the wall should you set
the base of the ladder? -Correct Answer ✔1 foot per 4 rungs
When installing a shake roof over a comp roof, what must NOT be done? -Correct
Answer ✔Remove valleys with flashing
Corners on felt are folded and cemented: -Correct Answer ✔To prevent leaks
A raised delamination of roofing material usually caused by expansion of trapped water
vapor or other gases is called? -Correct Answer ✔A blister
In a 6" star pattern, how many chalk lines are needed? -Correct Answer ✔1
What is considered medium pitch for cold-process roofing? -Correct Answer ✔1/2" per
foot
To correctly prepare a single-ply roof over concrete, what is needed first? -Correct
Answer ✔Solvent
For corrugated steel and aluminum roofing, what is the minimum headlap? -Correct
Answer ✔6"
A gable (pitched) roof has a ridge 30ft long. It is 12 ft from the eave to the ridge. What is
the total square footage for the entire roof? -Correct Answer ✔720 sq ft
A gable (pitched) roof has a ridge 28ft long. It is 13 ft from the eave to ridge what is the
total square footage for the entire roof? -Correct Answer ✔728 sq ft
Roofing
C-39 Roofing Trade Practice Test 2 Study
Guide Questions and Answers Graded A+
2025
An asphalt-modified roof is: -Correct Answer ✔Torch-applied
A roof has a 7' run and 8" per unit rise. What is the total rise at the ridge? -Correct
Answer ✔56"
Which of the following is NOT used as a weathering surface in single-ply roofing? -
Correct Answer ✔Mica
If you know the lengths of two sides of a right angle, can you figure the length of the
third side? -Correct Answer ✔Yes, the third side squared = a2 + b2
The maximum heating temperature for steep asphalt is: -Correct Answer ✔525*F
What is the flash point of a coal-tar pitch kettle? -Correct Answer ✔240-280*F
What is the name of the thick, black, gummy plastic used for making temporary repairs
to damp roof surfaces? -Correct Answer ✔Wetpatch
Where are sump drains usually installed? -Correct Answer ✔Wood decks
Which would be used to strengthen the eaves of a gable roof? -Correct Answer ✔Fascia
For spans less than 10ft, what is the minimum size lumber that may be used with a
roofing jack? -Correct Answer ✔2" x 6"
Cal/OSHA may impose _______ concerning machinery. -Correct Answer ✔Fines and/or
restraining orders
Trusses should be spaced _______ apart for tile roofs. -Correct Answer ✔2'-6"
Which of the following does not influence the exposure of wood shingles? -Correct
Answer ✔Type of sheathing
Which of the following is least hazardous to your health? -Correct Answer ✔Hypalon
What is NOT a requirement when you reroof over a built-up roof? -Correct Answer
✔The deck must be torn up
Roofing
, Roofing
Which of the following is not a correct statement about PVC sheet-laying adhesives? -
Correct Answer ✔The overlap should be 10"
The main purpose of a base sheet is to provide: -Correct Answer ✔A welding process
Why must kerosene kettles NOT burn at a low flame for a long time? -Correct Answer
✔Carbon will build up in the coils
What is the best protector of metal? -Correct Answer ✔Red lead primer
What is a common requirement of asbestos, asphalt shingle, and slate roofs? -Correct
Answer ✔Underlayment
What are rubber sheet, one-sided latex base, and Kraft paper used for? -Correct
Answer ✔Vapor barrier
When setting up a ladder, how many feet per rung away from the wall should you set
the base of the ladder? -Correct Answer ✔1 foot per 4 rungs
When installing a shake roof over a comp roof, what must NOT be done? -Correct
Answer ✔Remove valleys with flashing
Corners on felt are folded and cemented: -Correct Answer ✔To prevent leaks
A raised delamination of roofing material usually caused by expansion of trapped water
vapor or other gases is called? -Correct Answer ✔A blister
In a 6" star pattern, how many chalk lines are needed? -Correct Answer ✔1
What is considered medium pitch for cold-process roofing? -Correct Answer ✔1/2" per
foot
To correctly prepare a single-ply roof over concrete, what is needed first? -Correct
Answer ✔Solvent
For corrugated steel and aluminum roofing, what is the minimum headlap? -Correct
Answer ✔6"
A gable (pitched) roof has a ridge 30ft long. It is 12 ft from the eave to the ridge. What is
the total square footage for the entire roof? -Correct Answer ✔720 sq ft
A gable (pitched) roof has a ridge 28ft long. It is 13 ft from the eave to ridge what is the
total square footage for the entire roof? -Correct Answer ✔728 sq ft
Roofing
