CSLB Class B General Contractor's License -
Building's Exam: Core Trades ACTUAL EXAM 2026
WITH CORRRECT ANSWERS!!
3 inches - ANSWER☑️⭐-What is the minimum drain pipe size for the toilet in a residential home?
B) Fire protection contractor - ANSWER☑️⭐-Who is licensed to install residential fire sprinkler systems?
A) Plumbing contractor
B) Fire protection contractor
C) General Building contractor
D) Pipeline contractor
C) Clean the surface using a power tool - ANSWER☑️⭐-When brazing or soldering gas pipes during the
installation of water heaters, what is the best way to prepare the pipe?
A) Clean it with water
B) Blow into the pipe using your lungs
C) Clean the surface using a power tool
D) Use a pressurized air canister
D) Endless rope lift - ANSWER☑️⭐-Which personal lift is not acceptable?
A) Scissor
B) Boom
C) Manual
,D) Endless rope lift
B) To soften PVC pipe before applying PVC cement - ANSWER☑️⭐-What is the purpose of PVC primer?
A) To glue PVC pipes to other materials
B) To soften PVC pipe before applying PVC cement
C) To prevent electrical shock
D) To help solder conduit or piping
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?
Building's Exam: Core Trades ACTUAL EXAM 2026
WITH CORRRECT ANSWERS!!
3 inches - ANSWER☑️⭐-What is the minimum drain pipe size for the toilet in a residential home?
B) Fire protection contractor - ANSWER☑️⭐-Who is licensed to install residential fire sprinkler systems?
A) Plumbing contractor
B) Fire protection contractor
C) General Building contractor
D) Pipeline contractor
C) Clean the surface using a power tool - ANSWER☑️⭐-When brazing or soldering gas pipes during the
installation of water heaters, what is the best way to prepare the pipe?
A) Clean it with water
B) Blow into the pipe using your lungs
C) Clean the surface using a power tool
D) Use a pressurized air canister
D) Endless rope lift - ANSWER☑️⭐-Which personal lift is not acceptable?
A) Scissor
B) Boom
C) Manual
,D) Endless rope lift
B) To soften PVC pipe before applying PVC cement - ANSWER☑️⭐-What is the purpose of PVC primer?
A) To glue PVC pipes to other materials
B) To soften PVC pipe before applying PVC cement
C) To prevent electrical shock
D) To help solder conduit or piping
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?
