Page 1 of 105
ICC P3 Plumbing Plans Examiner Exam COMPLETE
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR-JUST RELEASED
Summarized Exam Coverage – ICC P3 Plumbing Plans Examiner
The ICC P3 Plumbing Plans Examiner exam tests the ability to review plumbing construction documents
for compliance with the International Plumbing Code (IPC) and related standards. The exam
is open-book, 60 questions, 2.5 hours. Key topics include:
• Permits and Installation: Permit requirements, plan approval, inspections, testing of systems,
and installation standards.
• Fixtures & Appliances: Minimum fixture requirements for various occupancies, fixture
clearances, water closets, urinals, lavatories, bathtubs, showers, sinks, and drinking fountains.
Also includes accessibility requirements for plumbing fixtures.
• Water Heaters: Installation, safety devices (temperature and pressure relief valves), combustion
air, venting, and sizing of water heating equipment.
• Water Supply Distribution: Pipe sizing (based on fixture units, pressure, and friction loss),
materials, backflow prevention, cross-connection control, and water service sizing.
• Sanitary Drainage: Drain pipe sizing (fixture units), building drain and sewer sizing, grade,
cleanouts, materials, and indirect waste piping.
• Vents: Vent pipe sizing (circuit vents, loop vents, wet vents, combination waste and vent
systems), vent terminals, and venting methods for various fixtures.
• Traps, Interceptors, Separators, Special Piping, and Storage Systems: Trap seal protection, trap
sizing, grease interceptors, oil separators, sand interceptors, and storage tanks.
• Storm Drainage: Roof drain sizing, leader sizing, storm sewer sizing, and storm water disposal
methods.
• Health Care Plumbing: Medical gas and vacuum systems, non-flammable medical oxygen piping,
and plumbing requirements for health care facilities.
• Plans Examination Procedures: Reviewing documents for completeness, verifying code
compliance, checking load calculations (drainage fixture units, water supply fixture units, vent
sizing), and understanding of related codes (International Fuel Gas Code for gas piping).
– ICC P3 Plumbing Plans Examiner Exam
1. A commercial building has a 4-inch building drain that is 120 feet long. The required slope for a 4-inch
building drain under the IPC is:
A) 1/8 inch per foot
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B) 1/4 inch per foot
C) 1/2 inch per foot
D) Not specified; determined by design
*Answer: B — IPC Chapter 7 requires a minimum slope of 1/4 inch per foot for building drains (except
8-inch and larger may be 1/8 inch per foot).*
2. An architect submits plans for a restaurant with 80 seats. How many water closets are minimally
required for the public (based on IPC Table 403.1)?
A) 1
B) 2
C) 3
D) 4
Answer: B — For a restaurant, the ratio is 1 water closet per 40 males and 1 per 40 females. 80 seats
would require 2 water closets (assuming even split).
3. The plans examiner is reviewing a water heater installation in a garage. The water heater is gas-fired.
Which of the following is a code violation?
A) Installation on a 4-inch raised concrete platform
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B) Combustion air supplied by louvered door to adjacent room
C) Temperature and pressure relief valve discharge pipe terminating 12 inches above the floor
D) The water heater is in a closet with a solid door and no additional combustion air opening
Answer: D — Gas water heaters in confined spaces require combustion air openings (two openings, one
high and one low).
4. Under IPC Table 403.1, a daycare center with 30 children requires how many water closets for the
children?
A) 1
B) 2
C) 3
D) 4
*Answer: A — Daycare requires 1 water closet per 25 children. 30 children require 2 water closets?
Wait: 30 ÷ 25 = 1.2 → rounded up to 2. So B 2.*
5. A floor drain is located in a commercial kitchen and is connected to the sanitary drainage system.
What device must be installed to protect the floor drain trap seal?
A) A backwater valve
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B) A trap seal primer
C) A cleanout
D) A grease interceptor
Answer: B — Floor drains that may not receive frequent use require a trap seal primer to prevent trap
evaporation and sewer gas entry.
6. The plans show a 12-story office building with a roof drain. The roof drain is connected to a vertical
leader that discharges to a storm sewer. According to IPC Chapter 11, what is the minimum number of
roof drains required for a roof area of 15,000 square feet? (Assume moderate rainfall rate)
A) 1
B) 2
C) 3
D) 4
Answer: B — IPC requires at least two roof drains for any roof area, unless the roof is sloped to one drain.
7. A wet vent is used to serve a bathroom group consisting of a water closet, lavatory, and tub. The wet
vent must be sized based on the drainage fixture unit (DFU) load of the water closet plus the largest
other fixture. The water closet is rated at 4 DFUs. The total wet vent DFU load is:
ICC P3 Plumbing Plans Examiner Exam COMPLETE
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR-JUST RELEASED
Summarized Exam Coverage – ICC P3 Plumbing Plans Examiner
The ICC P3 Plumbing Plans Examiner exam tests the ability to review plumbing construction documents
for compliance with the International Plumbing Code (IPC) and related standards. The exam
is open-book, 60 questions, 2.5 hours. Key topics include:
• Permits and Installation: Permit requirements, plan approval, inspections, testing of systems,
and installation standards.
• Fixtures & Appliances: Minimum fixture requirements for various occupancies, fixture
clearances, water closets, urinals, lavatories, bathtubs, showers, sinks, and drinking fountains.
Also includes accessibility requirements for plumbing fixtures.
• Water Heaters: Installation, safety devices (temperature and pressure relief valves), combustion
air, venting, and sizing of water heating equipment.
• Water Supply Distribution: Pipe sizing (based on fixture units, pressure, and friction loss),
materials, backflow prevention, cross-connection control, and water service sizing.
• Sanitary Drainage: Drain pipe sizing (fixture units), building drain and sewer sizing, grade,
cleanouts, materials, and indirect waste piping.
• Vents: Vent pipe sizing (circuit vents, loop vents, wet vents, combination waste and vent
systems), vent terminals, and venting methods for various fixtures.
• Traps, Interceptors, Separators, Special Piping, and Storage Systems: Trap seal protection, trap
sizing, grease interceptors, oil separators, sand interceptors, and storage tanks.
• Storm Drainage: Roof drain sizing, leader sizing, storm sewer sizing, and storm water disposal
methods.
• Health Care Plumbing: Medical gas and vacuum systems, non-flammable medical oxygen piping,
and plumbing requirements for health care facilities.
• Plans Examination Procedures: Reviewing documents for completeness, verifying code
compliance, checking load calculations (drainage fixture units, water supply fixture units, vent
sizing), and understanding of related codes (International Fuel Gas Code for gas piping).
– ICC P3 Plumbing Plans Examiner Exam
1. A commercial building has a 4-inch building drain that is 120 feet long. The required slope for a 4-inch
building drain under the IPC is:
A) 1/8 inch per foot
, Page 2 of 105
B) 1/4 inch per foot
C) 1/2 inch per foot
D) Not specified; determined by design
*Answer: B — IPC Chapter 7 requires a minimum slope of 1/4 inch per foot for building drains (except
8-inch and larger may be 1/8 inch per foot).*
2. An architect submits plans for a restaurant with 80 seats. How many water closets are minimally
required for the public (based on IPC Table 403.1)?
A) 1
B) 2
C) 3
D) 4
Answer: B — For a restaurant, the ratio is 1 water closet per 40 males and 1 per 40 females. 80 seats
would require 2 water closets (assuming even split).
3. The plans examiner is reviewing a water heater installation in a garage. The water heater is gas-fired.
Which of the following is a code violation?
A) Installation on a 4-inch raised concrete platform
, Page 3 of 105
B) Combustion air supplied by louvered door to adjacent room
C) Temperature and pressure relief valve discharge pipe terminating 12 inches above the floor
D) The water heater is in a closet with a solid door and no additional combustion air opening
Answer: D — Gas water heaters in confined spaces require combustion air openings (two openings, one
high and one low).
4. Under IPC Table 403.1, a daycare center with 30 children requires how many water closets for the
children?
A) 1
B) 2
C) 3
D) 4
*Answer: A — Daycare requires 1 water closet per 25 children. 30 children require 2 water closets?
Wait: 30 ÷ 25 = 1.2 → rounded up to 2. So B 2.*
5. A floor drain is located in a commercial kitchen and is connected to the sanitary drainage system.
What device must be installed to protect the floor drain trap seal?
A) A backwater valve
, Page 4 of 105
B) A trap seal primer
C) A cleanout
D) A grease interceptor
Answer: B — Floor drains that may not receive frequent use require a trap seal primer to prevent trap
evaporation and sewer gas entry.
6. The plans show a 12-story office building with a roof drain. The roof drain is connected to a vertical
leader that discharges to a storm sewer. According to IPC Chapter 11, what is the minimum number of
roof drains required for a roof area of 15,000 square feet? (Assume moderate rainfall rate)
A) 1
B) 2
C) 3
D) 4
Answer: B — IPC requires at least two roof drains for any roof area, unless the roof is sloped to one drain.
7. A wet vent is used to serve a bathroom group consisting of a water closet, lavatory, and tub. The wet
vent must be sized based on the drainage fixture unit (DFU) load of the water closet plus the largest
other fixture. The water closet is rated at 4 DFUs. The total wet vent DFU load is:
