California Roofing Contractor License
Exam (C-39) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the minimum slope required for asphalt shingles on a roof
without special underlayment?
A. 1:12
B. 2:12
C. 4:12
D. 6:12
Asphalt shingles require a minimum slope of 4:12 without special
underlayment to ensure proper drainage and avoid water penetration.
2. What type of underlayment is typically required beneath clay tile
roofing?
A. No underlayment
B. One layer of 15-pound felt
C. Two layers of 30-pound felt or an approved synthetic
D. One layer of self-adhered membrane
Tile roofs require double underlayment for added protection against water
infiltration due to the gaps in tiles.
,3. When installing composition shingles, what is the standard minimum
headlap?
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
A 2-inch headlap ensures proper overlap between shingle courses,
preventing water intrusion.
4. Which tool is commonly used to remove old shingles?
A. Circular saw
B. Framing hammer
C. Tin snips
D. Roofing shovel
Roofing shovels are designed to lift and remove old shingles and nails
efficiently.
5. A valley in a roof is:
A. The highest point on a gable roof
B. The inside corner where two roof planes meet
C. The ridge board
D. A type of rafter
Valleys collect water from adjoining roof slopes and must be flashed
properly to prevent leaks.
6. Which of the following is a primary cause of roof failure?
A. Too many vents
B. Improper flashing installation
C. Using plywood instead of OSB
D. Using architectural shingles
Improper flashing causes leaks at vulnerable points like chimneys, valleys,
and walls.
, 7. What is the typical lifespan of a 30-year architectural shingle?
A. 10–15 years
B. 20–25 years
C. 25–30 years
D. 40–50 years
Architectural shingles are designed to last 25 to 30 years under normal
conditions.
8. What is the minimum required overlap for felt underlayment on a
sloped roof?
A. 1 inch
B. 2 inches
C. 3 inches
D. 6 inches
Overlapping felt by at least 2 inches provides continuous coverage and
prevents water infiltration.
9. Which roof covering is most appropriate for very low slope roofs?
A. Asphalt shingles
B. Metal panels
C. Modified bitumen membrane
D. Clay tile
Modified bitumen and similar membranes are designed for low-slope or
flat roofs.
10. Which of the following best defines "cool roofing"?
A. Roofing that retains heat
B. Roofs that are installed in winter
C. Roofing materials that reflect solar energy
D. Roofs with light colors
Cool roofs reduce heat gain by reflecting more sunlight and absorbing less
heat.
Exam (C-39) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the minimum slope required for asphalt shingles on a roof
without special underlayment?
A. 1:12
B. 2:12
C. 4:12
D. 6:12
Asphalt shingles require a minimum slope of 4:12 without special
underlayment to ensure proper drainage and avoid water penetration.
2. What type of underlayment is typically required beneath clay tile
roofing?
A. No underlayment
B. One layer of 15-pound felt
C. Two layers of 30-pound felt or an approved synthetic
D. One layer of self-adhered membrane
Tile roofs require double underlayment for added protection against water
infiltration due to the gaps in tiles.
,3. When installing composition shingles, what is the standard minimum
headlap?
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
A 2-inch headlap ensures proper overlap between shingle courses,
preventing water intrusion.
4. Which tool is commonly used to remove old shingles?
A. Circular saw
B. Framing hammer
C. Tin snips
D. Roofing shovel
Roofing shovels are designed to lift and remove old shingles and nails
efficiently.
5. A valley in a roof is:
A. The highest point on a gable roof
B. The inside corner where two roof planes meet
C. The ridge board
D. A type of rafter
Valleys collect water from adjoining roof slopes and must be flashed
properly to prevent leaks.
6. Which of the following is a primary cause of roof failure?
A. Too many vents
B. Improper flashing installation
C. Using plywood instead of OSB
D. Using architectural shingles
Improper flashing causes leaks at vulnerable points like chimneys, valleys,
and walls.
, 7. What is the typical lifespan of a 30-year architectural shingle?
A. 10–15 years
B. 20–25 years
C. 25–30 years
D. 40–50 years
Architectural shingles are designed to last 25 to 30 years under normal
conditions.
8. What is the minimum required overlap for felt underlayment on a
sloped roof?
A. 1 inch
B. 2 inches
C. 3 inches
D. 6 inches
Overlapping felt by at least 2 inches provides continuous coverage and
prevents water infiltration.
9. Which roof covering is most appropriate for very low slope roofs?
A. Asphalt shingles
B. Metal panels
C. Modified bitumen membrane
D. Clay tile
Modified bitumen and similar membranes are designed for low-slope or
flat roofs.
10. Which of the following best defines "cool roofing"?
A. Roofing that retains heat
B. Roofs that are installed in winter
C. Roofing materials that reflect solar energy
D. Roofs with light colors
Cool roofs reduce heat gain by reflecting more sunlight and absorbing less
heat.
