About PI Exam Prep
An independent practice platform for the IAPMO - UPC Residential and Commercial Plumbing Inspector (PI) exam - real questions across every exam domain, each with a plain-language explanation.
What's on the PI exam
The IAPMO - UPC Residential and Commercial Plumbing Inspector (PI) exam is organized into 19 knowledge domains. It has 100 questions and is completed in 3 hours. Each domain makes up a different share of the exam, so the most efficient way to prepare is to know where the weight sits and practice accordingly:
- Definitions5% of the exam
- General Regulations5% of the exam
- Fixtures and Fixture Fittings3% of the exam
- Water Heaters10% of the exam
- Water Supply and Distribution10% of the exam
- Water Pipe Sizing5% of the exam
- Sanitary Drainage8% of the exam
- DWV Sizing7% of the exam
- Indirect Waste5% of the exam
- Vents12% of the exam
- Traps and Interceptors4% of the exam
- Storm Drainage4% of the exam
- Fuel Gas Piping8% of the exam
- Gas Piping Sizing4% of the exam
- Med-Gas1% of the exam
- Fire-stop Protection1% of the exam
- Alternate Water Sources3% of the exam
- Non-potable Rainwater Catchment Systems2% of the exam
- Reference Standards3% of the exam
Every practice question on this site is organized across these 19 domains, so your study tracks the real exam structure instead of guesswork. As you answer, the per-domain analytics surface the areas still costing you points, so your review goes where it moves your score.
What we believe good exam prep looks like
Realistic practice beats passive reading. Every question is written to mirror the style and difficulty of the real exam, with a clear explanation of why the right answer is right and the others aren't.
Your weak spots should find you. Domain analytics, mistake review, and re-drilling are built in, so study time goes where it moves your score.
Pricing should be simple. One payment for a fixed access window matched to your exam date. No subscription, no auto-renewal, and 10 free questions to try before you spend anything.
Get in touch
Questions, feedback, or something not working? Email support@boardmentor.study - candidate messages are read and answered.