I’ve been running into these plumbing vent valves a lot recently, the kind that do not require roof penetration, and I’m curious to know from some more seasoned inspectors what they think of them. Are these kind of venting valves okay under a kitchen sink or in the attic?
Just ran into my first AAV in an attic this week on a 3 inch vent set me back on my heels for a moment used to seeing them on sinks not in the attics here; darn Plumbers connot find a good one any more all they want to do is take short cuts. Maybe we should all turn the clocks back and start using outhouses again???
It is not unusual that you should be seeing air admittance valves on plumbing vents in Oklahoma since Oklahoma has adopted the International Plumbing Code and the plumbing provisions of the International Residential Code statewide.
Both the IPC and IRC plumbing provisions allow air admittance valves on all vents except for pneumatic sewage ejectors, except on the required one 3" vent that penetrates the roof as a main vent, and where local codes restrict or forbid AAV use.
AAVs are also allowed in Maine jurisdictions and elsewhere that have adopted the IPC and IRC plumbing provisions.
To see which ICC Codes, if any your state or municipal jurisidction have adopted, click the state on the ICC map link here:
I will bet anything you have to loose.
The home was a 100 years in age and had been gutted in 1995 with a new bathroom installed in the original part of the home the plumber just did not want to cut a hole in the roof. Would of been very easy in that location of the roof that is why they started making hole saws and sawzalls???