CSLB B LICENSE GENERAL CONTRACTOR
COMPREHENSIVE STUDY GUIDE 2026
FULL ANSWERS GRADED A+
⩥ The most important consideration in preparing a building site is?
Answer: Drainage is the most important consideration in preparing a
building site.
⩥ What is the minimum size lumber to use in constructing horse
scaffolding 5 ft in height?
Answer: A horse scaffolding legs must be made of 2" x 4" lumber and a
ledger made of 2" x 6" lumber.
⩥ How long should tile set on an organic adhesive bed in order to cure?
Answer: Tile should set on an organic adhesive bed for 24 hours to cure.
⩥ What is the maximum height in feet that you can build a retaining
wall without consulting a structural engineer?
Answer: 3' is the highest you can build a retaining wall without
consulting a structural engineer.
⩥ What is the maximum height of a threshold for a door designed for
disabled access?
,Answer: 1/2" is the maximum height of a threshold for a door designed
for disabled access.
⩥ Of the following, concrete would be poured against:
A. Any wood siding
B. Cedar or redwood siding only
C. metal flashing
D. Metal form material
Answer: Metal form material
⩥ The function of a Waler is?
Answer: A Waler is a horizontal member used to align and brace
concrete forms or piles.
⩥ If the width of a door that swings TOWARDS a landing on a ramp is
36", what minimum length landing is required?
Answer: A 78" landing is required for a 36" door that swings
TOWARDS a landing.
⩥ What are "as built" plants?
Answer: As built plans are plans showing all changes and repairs.
,⩥ Which is the proper order of construction for the following building
trades?
A. framing, plumbing, electrical, insulation
B. Plumbing, electrical, insulation, framing
C. Electrical, insulation, framing, plumbing
D. Insulation, framing, plumbing, electrical
Answer: Framing, plumbing, electrical, insulation.
⩥ According to the UBC, what is the proper height of a handrail for a
stairway?
Answer: A handrail for a stairway must be at least 34" high and no more
than 38".
⩥ Dividing volts by amps gives:
Answer: Dividing volts by amps gives you ohms.
⩥ Why would you install a vapor barrier under a concrete slab?
Answer: A vapor barrier is installed under a concrete slab to control the
rise of water vapor.
⩥ When must the stamped grade mark be visible on lumber?
Answer: A stamped grade mark must be visible on all framing members.
, ⩥ For a custom cut roof structure, how much greater than the cut end of
a rafter does the ridge width need to be?
Answer: The ridge does not need to be thicker than the end cut of a
rafter.
⩥ What is the correct space (gap) between a finished floor and bottom of
an interior door with no threshold.
Answer: 1/2" is the correct gap between finished floor and the bottom of
an interior door with no threshold.
⩥ What is the tolerance on longitudinal placement of rebar when the bar
is bent at one end?
Answer: The tolerance on longitudinal placement of rebar when the bar
is bent on one end is + or - 0" on the straight end, and 1/2" on the bent
end.
⩥ Which of the following is a measure of power load?
A. Voltage
B. Amperage
C. Watts
D. Ohms
Answer: Watts is the measure of power load.
COMPREHENSIVE STUDY GUIDE 2026
FULL ANSWERS GRADED A+
⩥ The most important consideration in preparing a building site is?
Answer: Drainage is the most important consideration in preparing a
building site.
⩥ What is the minimum size lumber to use in constructing horse
scaffolding 5 ft in height?
Answer: A horse scaffolding legs must be made of 2" x 4" lumber and a
ledger made of 2" x 6" lumber.
⩥ How long should tile set on an organic adhesive bed in order to cure?
Answer: Tile should set on an organic adhesive bed for 24 hours to cure.
⩥ What is the maximum height in feet that you can build a retaining
wall without consulting a structural engineer?
Answer: 3' is the highest you can build a retaining wall without
consulting a structural engineer.
⩥ What is the maximum height of a threshold for a door designed for
disabled access?
,Answer: 1/2" is the maximum height of a threshold for a door designed
for disabled access.
⩥ Of the following, concrete would be poured against:
A. Any wood siding
B. Cedar or redwood siding only
C. metal flashing
D. Metal form material
Answer: Metal form material
⩥ The function of a Waler is?
Answer: A Waler is a horizontal member used to align and brace
concrete forms or piles.
⩥ If the width of a door that swings TOWARDS a landing on a ramp is
36", what minimum length landing is required?
Answer: A 78" landing is required for a 36" door that swings
TOWARDS a landing.
⩥ What are "as built" plants?
Answer: As built plans are plans showing all changes and repairs.
,⩥ Which is the proper order of construction for the following building
trades?
A. framing, plumbing, electrical, insulation
B. Plumbing, electrical, insulation, framing
C. Electrical, insulation, framing, plumbing
D. Insulation, framing, plumbing, electrical
Answer: Framing, plumbing, electrical, insulation.
⩥ According to the UBC, what is the proper height of a handrail for a
stairway?
Answer: A handrail for a stairway must be at least 34" high and no more
than 38".
⩥ Dividing volts by amps gives:
Answer: Dividing volts by amps gives you ohms.
⩥ Why would you install a vapor barrier under a concrete slab?
Answer: A vapor barrier is installed under a concrete slab to control the
rise of water vapor.
⩥ When must the stamped grade mark be visible on lumber?
Answer: A stamped grade mark must be visible on all framing members.
, ⩥ For a custom cut roof structure, how much greater than the cut end of
a rafter does the ridge width need to be?
Answer: The ridge does not need to be thicker than the end cut of a
rafter.
⩥ What is the correct space (gap) between a finished floor and bottom of
an interior door with no threshold.
Answer: 1/2" is the correct gap between finished floor and the bottom of
an interior door with no threshold.
⩥ What is the tolerance on longitudinal placement of rebar when the bar
is bent at one end?
Answer: The tolerance on longitudinal placement of rebar when the bar
is bent on one end is + or - 0" on the straight end, and 1/2" on the bent
end.
⩥ Which of the following is a measure of power load?
A. Voltage
B. Amperage
C. Watts
D. Ohms
Answer: Watts is the measure of power load.
