IRC PLUMBING CERTIFICATION
EVALUATION 2026 PRACTICE QUESTIONS
AND ANSWERS FULL SOLUTION VIEW
●● Additions, alterations, renovations and repairs to existing plumbing
systems shall conform to that required for a new plumbing system
without requiring the existing plumbing system to comply with the?.
Answer: IRC code
●● In concealed locations, where piping, other than cast-iron or
galvanized steel, is installed through holes or notches in studs, joists,
rafters or similar members less than 1 1/4 inches from the nearest edge
of the member, the pipe shall be protected by?.
Answer: Steel shield plates
●● Steel shield plates used to protect plumbing shall have a thickness of
not less than .0575 inch (No. 16 Gage). Such plates shall cover the area
of the pipe where the member is notched or bored, and shall extend not
less than ________ above sole plates and below top plates..
Answer: 2 inches
●● Metallic piping shall not be placed in direct contact with what type
of soil?.
Answer: Corrosive soil
, ●● Metallic pipping, except for cast iron, ductile iron and galvanized
steel, shall not be placed in direct contact with what types of materials?.
Answer: Steel framing members, concrete or masonry
●● The relieving arch or sleeve in a foundation wall shall be ________
greater than the pipe passing through the wall..
Answer: Two pipe sizes
●● Water service pipe shall be installed not less than _______ and not
less than 6 inches below the frost line.
Answer: 12 inches deep
●● How many hangers would be required for an installation of 6-inches
deep cast iron pipe using 5' lengths, that is 78 feet long?.
Answer: 15
●● Fixture tail pieces shall be not less than _______ in diameter for
sinks, dishwashers, laundry tubs, bathtubs and similar fixtures, and not
less than _______ in diameter for bidets, lavatories and similar fixtures..
Answer: 1 1/2 inches, 1 1/4 inches
●● Fixtures with concealed slip-joint connections shall be provided with
an access panel or utility space not less than _________ in its smallest
EVALUATION 2026 PRACTICE QUESTIONS
AND ANSWERS FULL SOLUTION VIEW
●● Additions, alterations, renovations and repairs to existing plumbing
systems shall conform to that required for a new plumbing system
without requiring the existing plumbing system to comply with the?.
Answer: IRC code
●● In concealed locations, where piping, other than cast-iron or
galvanized steel, is installed through holes or notches in studs, joists,
rafters or similar members less than 1 1/4 inches from the nearest edge
of the member, the pipe shall be protected by?.
Answer: Steel shield plates
●● Steel shield plates used to protect plumbing shall have a thickness of
not less than .0575 inch (No. 16 Gage). Such plates shall cover the area
of the pipe where the member is notched or bored, and shall extend not
less than ________ above sole plates and below top plates..
Answer: 2 inches
●● Metallic piping shall not be placed in direct contact with what type
of soil?.
Answer: Corrosive soil
, ●● Metallic pipping, except for cast iron, ductile iron and galvanized
steel, shall not be placed in direct contact with what types of materials?.
Answer: Steel framing members, concrete or masonry
●● The relieving arch or sleeve in a foundation wall shall be ________
greater than the pipe passing through the wall..
Answer: Two pipe sizes
●● Water service pipe shall be installed not less than _______ and not
less than 6 inches below the frost line.
Answer: 12 inches deep
●● How many hangers would be required for an installation of 6-inches
deep cast iron pipe using 5' lengths, that is 78 feet long?.
Answer: 15
●● Fixture tail pieces shall be not less than _______ in diameter for
sinks, dishwashers, laundry tubs, bathtubs and similar fixtures, and not
less than _______ in diameter for bidets, lavatories and similar fixtures..
Answer: 1 1/2 inches, 1 1/4 inches
●● Fixtures with concealed slip-joint connections shall be provided with
an access panel or utility space not less than _________ in its smallest
