California Roofing Contractor License
(C-39) Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026
1. What is the primary function of underlayment in a roofing system?
| | | | | | | | | |
A. Provide aesthetic appearance | |
B. Provide a moisture barrier | | |
C. Serve as the roof deck
| | | |
D. Reflect UV radiation | |
Underlayment protects the roof deck from moisture infiltration
| | | | | | |
|before the final roofing material is installed.
| | | | | |
2. What type of roof is most commonly used in residential construction
| | | | | | | | | |
|in California?
|
A. Flat roof
|
B. Metal roof |
C. Composition shingle roof | |
D. Built-up roof |
Composition shingles are cost-effective, durable, and popular in
| | | | | | |
|residential roofing. |
,3. What is the minimum slope required for asphalt shingles according to
| | | | | | | | | |
most building codes?
| | |
A. 1:12
B. 2:12
C. 4:12
D. 6:12
Asphalt shingles typically require a slope of at least 4:12 for proper
| | | | | | | | | | |
drainage and durability.
| | |
4. What is the correct method for installing flashing around a chimney?
| | | | | | | | | |
A. Staple it to the shingles| | | |
B. Install step flashing integrated with each shingle course
| | | | | | |
C. Install it on top of the chimney cap
| | | | | | |
D. Nail it under the roof deck
| | | | |
Step flashing is installed in layers with each shingle course to prevent
| | | | | | | | | | |
water infiltration.
| |
5. What is the primary cause of roof failure?
| | | | | | |
A. Insect damage |
B. Poor insulation |
C. Poor installation|
D. Lack of ventilation
| |
Improper installation leads to leaks, material failures, and reduced
| | | | | | | |
|roof lifespan.
|
6. Which tool is used to measure the pitch of a roof?
| | | | | | | | | |
A. Level
B. Plumb bob |
C. Roof pitch gauge | |
D. Framing square |
A roof pitch gauge or inclinometer is designed to measure slope
| | | | | | | | | |
angles accurately.
| |
, 7. What is a cricket in roofing terms?
| | | | | |
A. Insect that damages roofs | | |
B. Small ridge structure to divert water around obstructions
| | | | | | |
C. Type of fastener | |
D. A roof drainage system
| | |
A cricket diverts water away from the back side of roof penetrations
| | | | | | | | | | |
|like chimneys.
|
8. What safety equipment is mandatory for roofing over 6 feet?
| | | | | | | | |
A. Hard hat |
B. Fall protection system
| |
C. Safety glasses |
D. Back brace |
OSHA requires fall protection for work performed at elevations over
| | | | | | | | |
|6 feet.
|
9. Which of the following materials is most commonly used for low-slope
| | | | | | | | | |
|roofing?
A. Asphalt shingles |
B. Metal panels |
C. Modified bitumen |
D. Clay tile |
Modified bitumen is designed for low-slope or flat roofs due to its
| | | | | | | | | | |
|waterproofing ability. |
10. What is a ridge vent used for? | | | | | |
A. Stopping leaks |
B. Ventilating attic space | |
C. Collecting rainwater |
D. Holding roof shingles | |
Ridge vents allow hot, moist air to escape from the attic, improving
| | | | | | | | | | |
| ventilation.
(C-39) Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026
1. What is the primary function of underlayment in a roofing system?
| | | | | | | | | |
A. Provide aesthetic appearance | |
B. Provide a moisture barrier | | |
C. Serve as the roof deck
| | | |
D. Reflect UV radiation | |
Underlayment protects the roof deck from moisture infiltration
| | | | | | |
|before the final roofing material is installed.
| | | | | |
2. What type of roof is most commonly used in residential construction
| | | | | | | | | |
|in California?
|
A. Flat roof
|
B. Metal roof |
C. Composition shingle roof | |
D. Built-up roof |
Composition shingles are cost-effective, durable, and popular in
| | | | | | |
|residential roofing. |
,3. What is the minimum slope required for asphalt shingles according to
| | | | | | | | | |
most building codes?
| | |
A. 1:12
B. 2:12
C. 4:12
D. 6:12
Asphalt shingles typically require a slope of at least 4:12 for proper
| | | | | | | | | | |
drainage and durability.
| | |
4. What is the correct method for installing flashing around a chimney?
| | | | | | | | | |
A. Staple it to the shingles| | | |
B. Install step flashing integrated with each shingle course
| | | | | | |
C. Install it on top of the chimney cap
| | | | | | |
D. Nail it under the roof deck
| | | | |
Step flashing is installed in layers with each shingle course to prevent
| | | | | | | | | | |
water infiltration.
| |
5. What is the primary cause of roof failure?
| | | | | | |
A. Insect damage |
B. Poor insulation |
C. Poor installation|
D. Lack of ventilation
| |
Improper installation leads to leaks, material failures, and reduced
| | | | | | | |
|roof lifespan.
|
6. Which tool is used to measure the pitch of a roof?
| | | | | | | | | |
A. Level
B. Plumb bob |
C. Roof pitch gauge | |
D. Framing square |
A roof pitch gauge or inclinometer is designed to measure slope
| | | | | | | | | |
angles accurately.
| |
, 7. What is a cricket in roofing terms?
| | | | | |
A. Insect that damages roofs | | |
B. Small ridge structure to divert water around obstructions
| | | | | | |
C. Type of fastener | |
D. A roof drainage system
| | |
A cricket diverts water away from the back side of roof penetrations
| | | | | | | | | | |
|like chimneys.
|
8. What safety equipment is mandatory for roofing over 6 feet?
| | | | | | | | |
A. Hard hat |
B. Fall protection system
| |
C. Safety glasses |
D. Back brace |
OSHA requires fall protection for work performed at elevations over
| | | | | | | | |
|6 feet.
|
9. Which of the following materials is most commonly used for low-slope
| | | | | | | | | |
|roofing?
A. Asphalt shingles |
B. Metal panels |
C. Modified bitumen |
D. Clay tile |
Modified bitumen is designed for low-slope or flat roofs due to its
| | | | | | | | | | |
|waterproofing ability. |
10. What is a ridge vent used for? | | | | | |
A. Stopping leaks |
B. Ventilating attic space | |
C. Collecting rainwater |
D. Holding roof shingles | |
Ridge vents allow hot, moist air to escape from the attic, improving
| | | | | | | | | | |
| ventilation.
