CSLB B Exam | Contractors State License Board
(CSLB) B Exam Updated Fall 2025/2026.
1. If unused mortar stiffens due to hydration of cement, what must you do?
- Discard the mortar
2. What minimum time must you wait before caulking or grouting new tiles?
- 24-48 Hours
3. How long should you wait before installing tile on a shower pan?
- 24 Hours
4. Unstable dry rock, angular gravel, sandy loam, and cohesive soils having compressive
strengths greater than 0.5 and less than 1.5 tons/sq ft (tsf), are typical examples of:
- Type-B Soils
5. If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each
light?
- 35V
6. In a series circuit, the total voltage is divided equally.
For safety reasons, the maximum simple slope of an excavation, up to 20 ft deep, in
Type-B soil is:
- 1:1 (45°)
7. A Pittsburgh joint is used in:
- HVAC ductwork
8. The drain for a pressure relief valve on a water heater should be extended to:
- The outside of the building
9. What is the minimum slope toward the drain of a shower pan?
- 1/4" per foot (2%)
10. What is the diameter of #3 rebar?
- 3/8"
11. If a vendor fails to provide an MSDS, you have the right to call:
- Cal/OSHA or DOSH
12. When installing a door jamb, you need shims at:
- Both hinge and strike sides, three on each side.
13. Which of the following is used to adhere vinyl floors?
A. Epoxy cement
B. Asphalt mastic
C. Latex primer
D. White glue
- Epoxy cement
14. When do you need bracing for a drywall wall?
- Diagonal bracing is needed every 25' for any drywall wall.
15. How should you clear the roots from a construction site?
, - Clear roots to 12" below grade.
16. Dividing watts by amps gives you:
- Volts
17. The most frequent on-the-job roofing accidents are:
- Falls
18. Which of the following is NOT a type of wood block flooring?
A. Parquet
B. Wood Mosaic
C. Wood Tile
D. All of the above.
- Wood tile
19. Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings
- Second floor decking
20. The tool used to carry grout needed to patch a small hole is a:
A. Hawk
B. Poling board
C. Spot board
D. Mason's scutch
- Spot Board
21. Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
C. Extra strength vitrified clay
D. Copper
- Copper
22. Where do you need a fire wall?
A. Between a living room and a bedroom
B. Between a bedroom and a bathroom
C. Between a kitchen and a bath
D. A separation wall between a dwelling and an attachment
- A separation wall between a dwelling and an attachment.
23. What is the minimum clearance between rough ground and untreated subfloor joists?
- 18 inches
24. Who may remove asbestos?
, - Contractor with Asbestos Certification on license.
25. Which of the following is NOT likely to be found in significant proportions in granular
soil?
A. Gravel
B. Sand
C. Silt
D. Clay
- Clay
26. Stiles and rails are used on which of the following?
A. Furred walls
B. Roofs
C. Windows
D. Slabs
- Windows.
A stile is the vertical edges of the window and the rails are the bottom and top.
27. What does a high slump test indicate?
- Too much water.
28. Metal concrete forms should be?
A. Oiled
B. Watered
C. Placed against gravel
D. Discarded after each use
- Oiled
29. What does the R mean in a description of insulation?
- Resistance
30. What kind of door would you install for someone with a disability?
A. Automatic with minimum of 3 seconds to close
B. Automatic with maximum of 5 seconds to open
C. Manual with maximum of 8.5 pounds to operate
D. Either A or C
- Either A or C
31. Triple-walled metal chimney installations are regulated by:
- ICC
ICC-IBC-IRC is the international code council. IBC is international building code
commercial. IRC is the international residential code.
32. If you are a general contractor, you should call a specialty contractor when:
- You encounter an unfamiliar trade.
(CSLB) B Exam Updated Fall 2025/2026.
1. If unused mortar stiffens due to hydration of cement, what must you do?
- Discard the mortar
2. What minimum time must you wait before caulking or grouting new tiles?
- 24-48 Hours
3. How long should you wait before installing tile on a shower pan?
- 24 Hours
4. Unstable dry rock, angular gravel, sandy loam, and cohesive soils having compressive
strengths greater than 0.5 and less than 1.5 tons/sq ft (tsf), are typical examples of:
- Type-B Soils
5. If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each
light?
- 35V
6. In a series circuit, the total voltage is divided equally.
For safety reasons, the maximum simple slope of an excavation, up to 20 ft deep, in
Type-B soil is:
- 1:1 (45°)
7. A Pittsburgh joint is used in:
- HVAC ductwork
8. The drain for a pressure relief valve on a water heater should be extended to:
- The outside of the building
9. What is the minimum slope toward the drain of a shower pan?
- 1/4" per foot (2%)
10. What is the diameter of #3 rebar?
- 3/8"
11. If a vendor fails to provide an MSDS, you have the right to call:
- Cal/OSHA or DOSH
12. When installing a door jamb, you need shims at:
- Both hinge and strike sides, three on each side.
13. Which of the following is used to adhere vinyl floors?
A. Epoxy cement
B. Asphalt mastic
C. Latex primer
D. White glue
- Epoxy cement
14. When do you need bracing for a drywall wall?
- Diagonal bracing is needed every 25' for any drywall wall.
15. How should you clear the roots from a construction site?
, - Clear roots to 12" below grade.
16. Dividing watts by amps gives you:
- Volts
17. The most frequent on-the-job roofing accidents are:
- Falls
18. Which of the following is NOT a type of wood block flooring?
A. Parquet
B. Wood Mosaic
C. Wood Tile
D. All of the above.
- Wood tile
19. Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings
- Second floor decking
20. The tool used to carry grout needed to patch a small hole is a:
A. Hawk
B. Poling board
C. Spot board
D. Mason's scutch
- Spot Board
21. Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
C. Extra strength vitrified clay
D. Copper
- Copper
22. Where do you need a fire wall?
A. Between a living room and a bedroom
B. Between a bedroom and a bathroom
C. Between a kitchen and a bath
D. A separation wall between a dwelling and an attachment
- A separation wall between a dwelling and an attachment.
23. What is the minimum clearance between rough ground and untreated subfloor joists?
- 18 inches
24. Who may remove asbestos?
, - Contractor with Asbestos Certification on license.
25. Which of the following is NOT likely to be found in significant proportions in granular
soil?
A. Gravel
B. Sand
C. Silt
D. Clay
- Clay
26. Stiles and rails are used on which of the following?
A. Furred walls
B. Roofs
C. Windows
D. Slabs
- Windows.
A stile is the vertical edges of the window and the rails are the bottom and top.
27. What does a high slump test indicate?
- Too much water.
28. Metal concrete forms should be?
A. Oiled
B. Watered
C. Placed against gravel
D. Discarded after each use
- Oiled
29. What does the R mean in a description of insulation?
- Resistance
30. What kind of door would you install for someone with a disability?
A. Automatic with minimum of 3 seconds to close
B. Automatic with maximum of 5 seconds to open
C. Manual with maximum of 8.5 pounds to operate
D. Either A or C
- Either A or C
31. Triple-walled metal chimney installations are regulated by:
- ICC
ICC-IBC-IRC is the international code council. IBC is international building code
commercial. IRC is the international residential code.
32. If you are a general contractor, you should call a specialty contractor when:
- You encounter an unfamiliar trade.
