CSLB C-39 Roofing (Trade Exam) Practice Test
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| Administering body | Contractors State License Board (CSLB), California Department of Consumer Affairs — exam delivered by PSI Services LLC |
|---|---|
| Questions | Not published by CSLB What we read and found nothing in: CSLB — Step 7: Studying for the Examination |
| Time limit | 210 minutes |
| Passing score | Not published by CSLB What we read and found nothing in: CSLB — Step 7: Studying for the Examination |
| Fees |
Source: CSLB — List of All CSLB Fees |
| Languages offered | English · Spanish |
Frequently asked questions
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Sample practice questions
A few real questions from this free bank, with full explanations. Use the practice tool above for the whole set.
- 1. Planning and Estimating
Which material is named in CSLB's definition of the C-39 Roofing classification?
- a.Structural steel
- b.Urethane foam
- c.Gypsum drywall
- d.Ceramic floor tile
Answer: b
Explanation: CSLB's C-39 definition lists roofing materials including urethane foam, metal roofing systems, shakes, shingles, tile and slate. Structural steel, drywall and floor tile belong to other classifications.
Source: Cal. Code Regs. tit. 16 §832.39 (C-39 classification)
- 2. Planning and Estimating
Under the Energy Code, how is a roof with a slope of 1-1/2:12 classified?
- a.Steep-sloped
- b.Low-sloped
- c.Flat roof exempt from rules
- d.Mansard
Answer: b
Explanation: The Energy Code defines a low-sloped roof as one with a rise-to-run ratio less than 2:12 and a steep-sloped roof as 2:12 or greater.
Source: 2025 Energy Code 100.1 definitions
- 3. Planning and Estimating
A four-person crew installs 10 squares per 8-hour day. How many labor hours does a 35-square job take?
- a.28 hours
- b.112 hours
- c.140 hours
- d.80 hours
Answer: b
Explanation: The job takes 35 / 10 = 3.5 days, and 4 workers x 8 hours x 3.5 days = 112 labor hours. Twenty-eight hours counts days but not workers.
Source: Roofing math
- 4. Job Site Preparation
An existing ice barrier membrane is well adhered to a sound, dry deck. During replacement, what may the roofer do with it?
- a.Cover it with more ice barrier, if permitted
- b.Leave it exposed as the finished roof
- c.Cover it with wood shakes directly
- d.Always grind it off the deck
Answer: a
Explanation: Where an adhered ice barrier is on sheathing that is not water soaked or deteriorated, it may remain and be covered with an additional ice barrier layer where the roof covering and ice barrier manufacturers permit.
Source: 2025 CRC R908.3 exception
- 5. Low-Slope Roof Projects
Which ASTM standard does the CBC list for PVC single-ply membrane?
- a.ASTM D4434
- b.ASTM D4637
- c.ASTM D6878
- d.ASTM D6754
Answer: a
Explanation: PVC or PVC/KEE membranes are listed under ASTM D4434. D4637 is EPDM, D6878 TPO and D6754 KEE.
Source: 2025 CBC Table 1507.12.2
- 6. Low-Slope Roof Projects
Which standard covers coal-tar pitch used in roofing?
- a.ASTM D312
- b.ASTM D41
- c.ASTM D450
- d.ASTM D6083
Answer: c
Explanation: Coal tar used in roofing is listed under ASTM D450, Type I or II. D312 is roofing asphalt, D41 asphalt primer and D6083 acrylic coating.
Source: 2025 CRC Table R905.9.2
- 7. Steep-Slope Roof Projects
When must valley linings be installed on an asphalt shingle roof?
- a.After the shingles, as a cover
- b.Before the shingles
- c.Only on slopes below 4:12
- d.Only when the valley is closed
Answer: b
Explanation: Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles.
Source: 2025 CRC R905.2.8.2
- 8. Steep-Slope Roof Projects
Which nail does the table specify for 24-inch wood shingles?
- a.4d box nails
- b.3d box nails
- c.8d common nails
- d.6d box nails
Answer: a
Explanation: The table specifies 3d box nails for 16- and 18-inch shingles and 4d box nails (1-1/2 in x 0.076) for 24-inch shingles.
Source: 2025 CRC Table R905.7.6(2)
- 9. Safety
What container does Cal/OSHA require for the first-aid kit on a construction project?
- a.A locked cabinet in the office
- b.The foreman's truck glove box
- c.Any cardboard box
- d.A weatherproof container
Answer: d
Explanation: Every employer on a construction project must provide at least one first-aid kit in a weatherproof container, with contents inspected and replaced.
Source: Cal. Code Regs. tit. 8 §1512
- 10. Safety
How far may a worker have to travel on a construction site to reach the nearest general-purpose (2A) fire extinguisher?
- a.No more than 25 feet
- b.No more than 200 feet
- c.No more than 75 feet
- d.Any distance on site
Answer: c
Explanation: A 2A extinguisher is required for each 3,000 sq ft, and travel distance to the nearest one may not exceed 75 feet.
Source: Cal. Code Regs. tit. 8 §1922(a)