IRC PLUMBING COMPREHENSIVE
ASSESSMENT 2026 TEST BANK QUESTIONS
AND SOLUTIONS GRADED A+
●● A water heater pan drain must extend full-size and terminate over a
suitably located indirect waste receptor or must extend to the exterior of
the building and terminate not less than _____ inches and not more than
_____ inches above the adjacent ground surface.
Answer: 6, 24
P2801.6.2
●● A laundry tray waste line is permitted to connect into a standpipe for
automatic clothes washer drain. The standpipe must extend not less than
_____ above the trap weir and must extend above the flood level rim of
the laundry tray.
Answer: 30 inches (762 mm)
P2706.1.2.1
●● Clothes closets, linen closets and pantries not exceeding _____ in
area, with the smallest dimension not greater than 3 feet (915 mm) and
having wall and ceiling surfaces of gypsum board will not require fire
sprinklers.
,Answer: 24 square feet (2.2 m2)
P2904.1.1
●● If a water closet can be removed to provide cleanout access, does
that fulfill the cleanout requirement of the code?
Answer: No
P3005.2.3
●● Appliances and equipment used for heating water or storing hot
water have to be protected by _____.
Answer: pressure-relief valve and temperature-relief valve or a
combination pressure and temperature-relief valve.
P2804.1
●● Where the fixture drains connect at different levels, the common vent
must connect as a _____ extension of the _____ drain.
Answer: vertical, vertical
P3107.3
,●● The minimum air gap distance in inches for lavatories and other
fixtures with effective opening not greater than 1/2 inch in diameter that
are close to a wall is:
Answer: 1.5
Table P2902.3.1
●● In areas prone to flooding as established by the code, water supply
systems must be designed and constructed to prevent _____ of
floodwaters.
Answer: infiltration
P2602.2
●● When either a public water-supply or sewer system, or both, are not
available, _____, an individual water-supply or individual sewage-
disposal system, or both, must be provided.
Answer: or connection thereto is not feasible
P2602.1
●● _____ installed in a bathroom are not required to be installed within
an enclosure.
Answer: direct-vent water heaters
, M2005.2
●● For water supply systems used predominantly for flush tanks having
a water supply fixture unit load of 12, what is the comparable demand in
gallons per minute.
Answer: 16.0
Table P2903.6(1)
●● Test equipment, materials and labor must be furnished by the ______
Answer: permittee
P2503.3
●● The minimum size in inches of a combination waste and vent pipe
connecting to a building drain or building sub drain and serving 31 d.f.u.
is _____.
Answer: 3
Table 3111.3
ASSESSMENT 2026 TEST BANK QUESTIONS
AND SOLUTIONS GRADED A+
●● A water heater pan drain must extend full-size and terminate over a
suitably located indirect waste receptor or must extend to the exterior of
the building and terminate not less than _____ inches and not more than
_____ inches above the adjacent ground surface.
Answer: 6, 24
P2801.6.2
●● A laundry tray waste line is permitted to connect into a standpipe for
automatic clothes washer drain. The standpipe must extend not less than
_____ above the trap weir and must extend above the flood level rim of
the laundry tray.
Answer: 30 inches (762 mm)
P2706.1.2.1
●● Clothes closets, linen closets and pantries not exceeding _____ in
area, with the smallest dimension not greater than 3 feet (915 mm) and
having wall and ceiling surfaces of gypsum board will not require fire
sprinklers.
,Answer: 24 square feet (2.2 m2)
P2904.1.1
●● If a water closet can be removed to provide cleanout access, does
that fulfill the cleanout requirement of the code?
Answer: No
P3005.2.3
●● Appliances and equipment used for heating water or storing hot
water have to be protected by _____.
Answer: pressure-relief valve and temperature-relief valve or a
combination pressure and temperature-relief valve.
P2804.1
●● Where the fixture drains connect at different levels, the common vent
must connect as a _____ extension of the _____ drain.
Answer: vertical, vertical
P3107.3
,●● The minimum air gap distance in inches for lavatories and other
fixtures with effective opening not greater than 1/2 inch in diameter that
are close to a wall is:
Answer: 1.5
Table P2902.3.1
●● In areas prone to flooding as established by the code, water supply
systems must be designed and constructed to prevent _____ of
floodwaters.
Answer: infiltration
P2602.2
●● When either a public water-supply or sewer system, or both, are not
available, _____, an individual water-supply or individual sewage-
disposal system, or both, must be provided.
Answer: or connection thereto is not feasible
P2602.1
●● _____ installed in a bathroom are not required to be installed within
an enclosure.
Answer: direct-vent water heaters
, M2005.2
●● For water supply systems used predominantly for flush tanks having
a water supply fixture unit load of 12, what is the comparable demand in
gallons per minute.
Answer: 16.0
Table P2903.6(1)
●● Test equipment, materials and labor must be furnished by the ______
Answer: permittee
P2503.3
●● The minimum size in inches of a combination waste and vent pipe
connecting to a building drain or building sub drain and serving 31 d.f.u.
is _____.
Answer: 3
Table 3111.3
