P1 · area 05 · subtopic 0502
Building Drains, Sewers, Branches, and Stacks
8 percent of the P1 Residential Plumbing Inspector exam. At 60 questions, that is roughly 4 to 5 questions, each with about 120 seconds of budget including the lookup.
- Exam
- P1
- Area
- Sanitary Drainage
- Weight
- 8%
- Questions
- ~4 to 5
What this subtopic covers
Proper sizing and installation of the building drain, building sewer, branches and stacks.
How to drill it
- Find the chapter of the International Residential Code that carries this subject and read it once for structure, not retention: what lives here, what gets sent elsewhere, which tables exist.
- Write your own plain-language phrases for what this subtopic covers, then note the code's terms beside them. Mismatches between the two columns are exactly where exam questions cost you time.
- Run timed lookups: pick a requirement named in the descriptor above, start a stopwatch, find the governing text in your book, stop. Log the seconds. Past two minutes is a miss even when the answer is right.
- Weight your reps to the number above. Roughly 4 to 5 questions means this subtopic deserves a dedicated drill session of its own.
2024 IRC Fast-TabsPre-printed tabs for the 2024 edition. Place them yourself; the placement is the study.Check priceNearby traps in area 05
p-trap under the sink is filed under traps, under sanitary drainage, subtopic 0504.
The rest of area 05: Sanitary Drainage (23%)
| Subtopic | Weight | |
|---|---|---|
| 0501 | Materials, Fittings, Joints, and Connections | 4% |
| 0503 | Backwater Valves, Sumps, Ejectors, and Cleanouts | 3% |
| 0504 | Traps | 5% |
| 0505 | Indirect Waste Systems | 3% |
The kit that goes on the table
2024 IRCThe book itself
2021 IRCIf you register on 20212024 Fast-TabsPlace them yourself
Construction Master ProFeet-inch math, no errorsMatch the book and tabs to the edition you register for.Confirm which, first.
The 120-second study sheet
One page: every topic weight on all four residential exams, the plain-language to code-language glossary, and the two-week study sequence. Free, straight to your inbox.
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