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Sanitary Drainage — ICC P1 Practice Questions

28 questions · 23% of the ICC P1 exam

Worked questions

1. An inspector is conducting a backflow prevention device test on a residential property. The device is a double-check valve. According to the 2024 International Residential Code, what is the recommended frequency of testing for this type of device?

  • AEvery 6 months
  • Every 12 months
  • CEvery 18 months
  • DEvery 24 months

Exam tip

Understand the code requirements for testing backflow prevention devices to ensure compliance and public safety.

Why B is correct

The correct answer is Every 12 months. According to Section R312.2.1 of the 2024 International Residential Code, double-check valves should be tested annually to ensure proper operation and prevent backflow.

2. What is the minimum slope required for the waste and vent piping in a residential building to ensure proper drainage?

  • A1/4 inch per foot
  • 1/8 inch per foot
  • C1/2 inch per foot
  • D3/16 inch per foot

Exam tip

Always verify that the slope of the waste and vent piping meets the code requirements to prevent future issues.

Why B is correct

According to Section R310.5 of the 2024 International Residential Code, the minimum slope for waste and vent piping is 1/8 inch per foot. This slope ensures that waste flows properly through the pipes and prevents clogs.

4. Which type of pipe is required for the vent stack of a water closet in a residential building?

  • APVC Schedule 40
  • BPVC Schedule 80
  • CPVC Schedule 40
  • DCPVC Schedule 80

Exam tip

Remember the specific requirements for vent stack materials to ensure compliance with the code.

Why C is correct

Section R310.2.1 of the 2024 International Residential Code specifies that the vent stack for a water closet must be made of CPVC Schedule 40. This material is suitable for hot and cold water applications and is durable.

24 more in the bank

Answers and explanations for these are in the app.

  • A plumber is designing a waste and vent system for a residential building. Which of the following is the correct venting distance from a fixture to the vent stack?
  • A plumber is installing a backflow preventer. Which of the following is the correct location for the backflow preventer?
  • A plumber is installing a waste and vent system for a kitchen sink. Which of the following is the minimum required venting height above the highest fixture trap?
  • A plumber is repairing a drain line. Which tool is most effective for cleaning a drain line?
  • A plumber is replacing the drainage piping in a bathroom. Which slope is required for the drain piping in a bathroom?
  • A property owner has reported low water pressure in their home. Which of the following is the most likely cause of this issue?
  • A residential property has a crawl space with a concrete floor. During the inspection, you notice that the drain pipes are located directly under the floor joists. What is the minimum clearance required between the bottom of the drain pipe and the top of the floor joist?
  • A residential property has a crawl space with a vent stack that extends above the roof. The vent stack is made of Schedule 40 PVC. According to the 2024 International Residential Code, what is the minimum height above the roof that the vent stack must be installed?
  • A residential property has a drainage system that includes a combination of cast iron and PVC piping. According to the 2024 International Residential Code, what is the maximum distance between cleanouts in a drainage system?
  • A vent stack for a lavatory is required to be a minimum of what size?
  • During an inspection of a residential property, you find that the water heater is located in an unventilated attic. What action should you take according to the 2024 International Residential Code?
  • In a residential setting, what is the minimum backflow prevention assembly required for a fire sprinkler system?
  • What is the maximum allowable temperature for the hot water discharge from a water heater?
  • What is the maximum distance a waste pipe can be from the vent stack in a residential building?
  • What is the maximum distance from the water heater to the vent termination in a residential setting?
  • What is the minimum required venting for a water heater in a residential property?
  • When is it necessary to install a backflow preventer on a water supply line?
  • When replacing an existing water heater, what is the minimum clearance required between the water heater and combustible materials?
  • Which of the following is not a requirement for the installation of a backwater valve in a residential property?
  • Which of the following is not a valid reason for a plumbing inspection in a residential property?
  • Which of the following is the correct venting method for a clothes washer in a residential building?
  • Which type of pipe is commonly used for the main waste and vent stack in a residential building, and what is the maximum length it can be?
  • Which type of pipe is typically used for the main drain from a building to the public sewer?
  • While inspecting an existing property, you come across a plumbing vent pipe that is discharging into a vertical stack vent. The vent pipe is located above the roof but is not visible from the ground. What is the minimum required height above the roof for a vent pipe to be considered accessible for inspection?

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