CSLB B COMPREHENSIVE TEST SCRIPT
2026 QUESTIONS WITH SOLUTIONS 100%
CORRECT.
◉ C) Flashing
(Leaks are most common when two surfaces meet or around
fenestration. Leaks are most prominent in valley flashing and improperly
installed window flashing.). Answer- What is the most common location
to find a roof leak?
A) Attic
B) Shingles
C) Flashing
D) Collar tie
◉ C) Pipe supports come into contact with metal piping
(Mainly due to water hammer.). Answer- What is the most common
reason for noise in piping when a water fixture is turned on or off?
,A) Hot water was used
B) Cold water was used
C) Pipe supports come into contact with metal piping
D) The walls are not up to code causing pipe failure
◉ C) Brass type. Answer- If you send your employee to purchase a 2-
inch water supply valve and they return with a 1.5-inch supply valve,
then what is the proper composition of the valve?
A) The casing must be made of plastic
B) The employee must return and purchase a wrought iron valve
C) Brass type
D) The connection must be silver and body made of iron
◉ 10. Answer- When penetrating a roof with an exhaust, the exhaust
must be no closer than _____ feet to any air intake or openable window.
◉ A) Class A. Answer- Which roof assembly has the best fire rating?
A) Class A
B) Class B
C) Class I
D) Class III
,◉ D) Use of materials that are compatible with the type of pipe and
fitting materials. Answer- What does material compatibility refer to
when installing alternate water sources in existing plumbing systems?
A) Plumbing fixtures have to come from the same manufacturer
B) Only the couplings must be made of metal
C) All plumbing connections must be soldered or brazed
D) Use of materials that are compatible with the type of pipe and fitting
materials
◉ C) Weather seal, weather strip, and apply caulking. Answer- When
you have a gap in the building envelope, what do you do to prevent air
leakage?
A) Stuff insulation into gaps
B) Put caulking in and around the gaps
C) Weather seal, weather strip, and apply caulking
D) Nothing, all buildings require air leakage
◉ 18 inches. Answer- In order to protect a water heater from damage,
what is the minimum height it should be from the floor of a garage?
◉4
, (According to the California Plumbing Code, the vertical piping between
two consecutive inlet levels shall be considered a wet-vented section.
Each wet-vented section shall be not less than one pipe size exceeding
the required minimum waste pipe size of the upper fixture or shall be
one pipe size exceeding the required minimum pipe size for the sum of
the fixture units served by such wet-vented section, whichever is larger,
but no case less than 2 inches.). Answer- How many plumbing fixtures
can be vented by a single vertical wet-vent?
◉ D) Inspect the tank and pump for mechanical problems. Answer-
After the construction of a new home you turn on the faucet in the
kitchen and the water pressure is extremely low, how should you
proceed to test the problem?
A) Call the inspector
B) Hire a plumbing contractor
C) Turn on the light switch
D) Inspect the tank and pump for mechanical problems
◉ 5/8". Answer- When drilling a 2 x 4 the minimum distance from the
edge to the hole should be:
◉ 0.75 inches. Answer- What is the minimum size a water supply pipe
to a building?
2026 QUESTIONS WITH SOLUTIONS 100%
CORRECT.
◉ C) Flashing
(Leaks are most common when two surfaces meet or around
fenestration. Leaks are most prominent in valley flashing and improperly
installed window flashing.). Answer- What is the most common location
to find a roof leak?
A) Attic
B) Shingles
C) Flashing
D) Collar tie
◉ C) Pipe supports come into contact with metal piping
(Mainly due to water hammer.). Answer- What is the most common
reason for noise in piping when a water fixture is turned on or off?
,A) Hot water was used
B) Cold water was used
C) Pipe supports come into contact with metal piping
D) The walls are not up to code causing pipe failure
◉ C) Brass type. Answer- If you send your employee to purchase a 2-
inch water supply valve and they return with a 1.5-inch supply valve,
then what is the proper composition of the valve?
A) The casing must be made of plastic
B) The employee must return and purchase a wrought iron valve
C) Brass type
D) The connection must be silver and body made of iron
◉ 10. Answer- When penetrating a roof with an exhaust, the exhaust
must be no closer than _____ feet to any air intake or openable window.
◉ A) Class A. Answer- Which roof assembly has the best fire rating?
A) Class A
B) Class B
C) Class I
D) Class III
,◉ D) Use of materials that are compatible with the type of pipe and
fitting materials. Answer- What does material compatibility refer to
when installing alternate water sources in existing plumbing systems?
A) Plumbing fixtures have to come from the same manufacturer
B) Only the couplings must be made of metal
C) All plumbing connections must be soldered or brazed
D) Use of materials that are compatible with the type of pipe and fitting
materials
◉ C) Weather seal, weather strip, and apply caulking. Answer- When
you have a gap in the building envelope, what do you do to prevent air
leakage?
A) Stuff insulation into gaps
B) Put caulking in and around the gaps
C) Weather seal, weather strip, and apply caulking
D) Nothing, all buildings require air leakage
◉ 18 inches. Answer- In order to protect a water heater from damage,
what is the minimum height it should be from the floor of a garage?
◉4
, (According to the California Plumbing Code, the vertical piping between
two consecutive inlet levels shall be considered a wet-vented section.
Each wet-vented section shall be not less than one pipe size exceeding
the required minimum waste pipe size of the upper fixture or shall be
one pipe size exceeding the required minimum pipe size for the sum of
the fixture units served by such wet-vented section, whichever is larger,
but no case less than 2 inches.). Answer- How many plumbing fixtures
can be vented by a single vertical wet-vent?
◉ D) Inspect the tank and pump for mechanical problems. Answer-
After the construction of a new home you turn on the faucet in the
kitchen and the water pressure is extremely low, how should you
proceed to test the problem?
A) Call the inspector
B) Hire a plumbing contractor
C) Turn on the light switch
D) Inspect the tank and pump for mechanical problems
◉ 5/8". Answer- When drilling a 2 x 4 the minimum distance from the
edge to the hole should be:
◉ 0.75 inches. Answer- What is the minimum size a water supply pipe
to a building?
