California Roofing Contractor License
(C-39) Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025 Q&A
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 2025 Q&A
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.
