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Colorado plumber licensing guide: IPC code practice

Licensing is state-specific. Consult your state licensing board and the relevant local authority to confirm the credential and requirements for your work. State licensing resources. CodeReady is general code practice, not aligned to this state’s exam blueprint, and does not confer a license.

Trade licensing exams commonly test code application. Plumbing preparation may involve the International Plumbing Code (IPC), Uniform Plumbing Code (UPC), or a state-specific plumbing code. The code edition adopted by the state or local authority and the edition tested may differ from this bank’s references (IPC 2021 track only). Local amendments can also matter.

UPC 2021 track: not yet available. This product provides IPC 2021 practice only, not UPC rules.

Before applying or buying prep, check the current candidate bulletin from your state licensing board or the relevant local authority. Confirm the credential, eligibility, tested code edition, and allowed reference materials. This general bank is not a state-specific exam simulation or an official board-endorsed course.

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Try three code-based questions.

1 / DWV sizing

Under the 2021 IPC, what is the general minimum slope for a horizontal drainage pipe 2.5 inches or smaller?

  1. 1/4 inch per foot
  2. 1/8 inch per foot
  3. 1/16 inch per foot
  4. 1 inch per foot
Show answer & explanation

1/4 inch per foot

Table 704.1 generally requires 1/4 inch per foot for pipes 2.5 inches or smaller. Verify any special application and local amendment.

2021 IPC Table 704.1

2 / DWV sizing

A drainage pipe passes through a foundation wall. Which installation approach is appropriate?

  1. Use a smaller pipe solely to avoid clearance
  2. Provide the required protection and coordinate the penetration with structural requirements
  3. Cut reinforcement without review
  4. Rest the pipe directly on sharp rubble
Show answer & explanation

Provide the required protection and coordinate the penetration with structural requirements

IPC 305.3 requires a relieving arch or a pipe sleeve through the foundation wall, with the sleeve two pipe sizes greater than the pipe. Structural protection requirements also apply.

2021 IPC 305.3; 307

3 / Venting

How should horizontal vent piping be graded?

  1. Perfectly level regardless of condensation
  2. Toward the potable-water main
  3. Toward a closed low point
  4. To drain back by gravity to the drainage system
Show answer & explanation

To drain back by gravity to the drainage system

Vent piping can collect condensation or rain. It must be arranged to drain by gravity back to the drainage system.

2021 IPC 905.2

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