The Homeowner's Plumbing Code Companion: 2025-2026 UPC and IPC Simplified

Most plumbing arguments end the same way: someone says "that's not to code." >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, >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 >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 >Know the rule before the inspector quotes it.