The Homeowner's Plumbing Code Companion: 2025-2026 UPC and IPC Simplified (Home Plumbing Guides) - Softcover

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Most plumbing arguments end the same way: someone says "that's not to code."
This book tells you whether they are right.

Two model codes govern American plumbing — the UPC and the IPC — and your
county has adopted one of them. They disagree on real things: how far a trap
arm may run, whether an air admittance valve is allowed at all, how steeply a
three-inch drain must fall. Chapter 2 shows you which one rules your house,
and every chapter after that gives you both answers where they differ.

Inside you will find:

• Permits, in plain terms: which jobs need one, how to pull it yourself, and
what happens if you skip it and later try to sell.
• What the inspector actually looks for, stage by stage, and the tests your
work must pass before the walls close.
• Pipe sizing, drain sizing and slope, with the numbers laid out in tables you
can read at the bench.
• Trap seals, trap arms and venting — including the AAV question, which the
two codes answer very differently.
• Backflow prevention explained by hazard: where a vacuum breaker is enough
and where only an RPZ will do.
• Fixture clearances, water heater rules, cleanout locations, and the
efficiency standards now in force.
• A full code walkthrough of a bathroom remodel, and the violations inspectors
write up most often.

Aligned to the 2025-2026 model codes and illustrated with more than 45
full-color figures. Written for the homeowner who wants the work to pass the
first time.

Know the rule before the inspector quotes it.

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