IPC 424.5

IPC 1003.3.5

Garbage disposals (food waste disposers) are generally prohibited from discharging through a grease interceptor. The ground food particles overwhelm the interceptor's capacity and require much more frequent cleaning, reducing effectiveness.

IPC 312.10 / ASSE 5110

Test cocks on backflow preventers must remain accessible for annual field testing by a certified tester. Obstructing or burying test cocks prevents required testing and is a violation of the water purveyor's cross-connection control program.

IPC 424.3 / ASSE 1016

All shower and tub/shower combination valves must be pressure-balancing, thermostatic-mixing, or combination type to prevent scalding. This is a life-safety requirement, especially for children and elderly.

IPC 501.1 / IFGC 305.3

Gas-fired water heaters in garages must have their ignition source elevated a minimum of 18 inches above the garage floor to prevent ignition of flammable vapors from gasoline and other fuels.

IPC 504.6

This installation has three serious code violations. First, the discharge pipe is 1/2 inch but the T&P valve outlet is 3/4 inch — the discharge pipe must never be smaller than the valve outlet size. Reducing the pipe restricts emergency relief flow and can cause dangerous pressure buildup. Second, CPVC is not rated for the 210 degrees F discharge temperature of a T&P valve — the pipe can soften and fail at the exact moment it is needed most. Third, no valve of any kind (ball valve, gate valve, or check valve) is permitted in the T&P discharge line. A closed valve prevents emergency pressure relief and can result in a catastrophic tank explosion. This is a life-safety issue that every UA apprentice must recognize immediately.

IPC 504.6.2

The T&P relief valve discharge pipe must not be smaller than the valve outlet, which is 3/4". Reducing the pipe restricts the relief flow and creates a dangerous pressure condition.