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General Requirements — ICC P1 Practice Questions

17 questions · 14% of the ICC P1 exam

Worked questions

1. Under 2024 IRC Section P2903.3.2, what is the maximum static water pressure for the domestic water supply system?

  • 80 psi
  • B60 psi
  • C70 psi
  • D50 psi

Where to look it up

https://codes.iccsafe.org/content/IRC2024V2.1/chapter-29-water-supply-and-distribution

Why A is correct

The static pressure may not exceed 80 psi. If the main pressure exceeds 80 psi, the section requires an approved pressure-reducing valve conforming to ASSE 1003 or CSA B356 on the domestic branch main or riser at its service connection. A main pressure of exactly 80 psi does not create the original invented requirement to reduce fixture pressure to 60 psi under this section. This is a static-pressure limit, not a fixture’s minimum pressure while flowing. Source: 2024 IRC, https://codes.iccsafe.org/content/IRC2024V2.1/chapter-29-water-supply-and-distribution

2. A plumber is installing a new water supply line in an existing home. The line must be installed in a concealed location. Which of the following materials is the most suitable for this application?

  • ACopper
  • BPVC
  • PEX
  • DGalvanized steel

Exam tip

PEX is often preferred for concealed installations due to its ease of installation and durability.

Why C is correct

According to Section P2601.1 of the 2024 International Residential Code, PEX (cross-linked polyethylene) is the most suitable material for concealed water supply lines due to its flexibility and resistance to corrosion.

3. Under 2024 IRC P3005.3, what is the minimum uniform slope for a horizontal drainage pipe with a diameter of 2 inches?

  • 1/4 inch per foot
  • B1/2 inch per foot
  • C3/4 inch per foot
  • D1 inch per foot

Where to look it up

https://codes.iccsafe.org/content/IRC2024P2/chapter-30-sanitary-drainage

Why A is correct

Use the diameter condition in P3005.3: a 2-inch pipe is in the 2½-inch-and-smaller group, requiring a minimum ¼ inch of fall per foot. Site elevation does not select this minimum. Source: 2024 IRC P3005.3, https://codes.iccsafe.org/content/IRC2024P2/chapter-30-sanitary-drainage

4. Under 2024 IRC P3005.3, what is the minimum uniform slope for a horizontal drainage pipe with a diameter of 3 inches?

  • 1/8 inch per foot
  • B1/4 inch per foot
  • C3/8 inch per foot
  • D1/2 inch per foot

Where to look it up

https://codes.iccsafe.org/content/IRC2024P2/chapter-30-sanitary-drainage

Why A is correct

P3005.3 places 3-inch and larger horizontal drainage piping in the group requiring at least ⅛ inch of fall per foot. Select the diameter group before calculating fall; crawl-space ground slope is not the criterion. Source: 2024 IRC P3005.3, https://codes.iccsafe.org/content/IRC2024P2/chapter-30-sanitary-drainage

5. A residential property is being constructed with a gas fireplace. Which of the following is the minimum required clearance between the gas fireplace and an adjacent wall?

  • A6 inches
  • 12 inches
  • C18 inches
  • D24 inches

Exam tip

Always check the specific clearance requirements for gas appliances to ensure safety.

Why B is correct

According to Section P3401.1 of the 2024 International Residential Code, the minimum required clearance between a gas fireplace and an adjacent wall is 12 inches to ensure safe installation and operation.

6. What is the minimum required water flow rate for a fire sprinkler system in a high-rise residential building?

  • A10 gallons per minute
  • B20 gallons per minute
  • C30 gallons per minute
  • 40 gallons per minute

Exam tip

Familiarize yourself with the fire protection requirements for different types of buildings.

Why D is correct

According to Section R314.1 of the 2024 International Residential Code, the minimum required water flow rate for a fire sprinkler system in a high-rise residential building is 40 gallons per minute. Options a, b, and c are incorrect as they do not meet the code requirements.

11 more in the bank

Answers and explanations for these are in the app.

  • A bathroom is being remodeled, and the existing exhaust fan is inadequate. What is the minimum required ventilation rate for a bathroom with a shower?
  • A property has a fire sprinkler system that requires annual maintenance. Which of the following tasks is NOT part of the annual maintenance?
  • A property has a kitchen sink that is not draining properly. Which of the following is the most likely cause of the problem?
  • A property has a lawn sprinkler system that is connected to the potable water supply. Which of the following devices is required to prevent backflow?
  • A residential building is equipped with a backflow prevention device. During an inspection, the inspector notices that the device is not functioning properly. What is the first step the inspector should take?
  • A residential property is being constructed with a roof that has a pitch of 4/12. Which of the following is the minimum required vent height for the DWV system?
  • A residential property is being constructed with an electric water heater. Which of the following is the minimum required clearances around the water heater?
  • A water heater is installed in a crawl space. What is the minimum required clearance from the water heater to any combustible material?
  • A water quality test indicates the presence of lead in the plumbing system. What is the required action according to the 2024 International Residential Code?
  • What is the minimum slope required for the drain line of a kitchen sink in a residential building?
  • Which type of backflow prevention device is required for a residential irrigation system that uses well water?

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