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Fixture venting

edsaunders84

Registered User
Joined
Dec 15, 2020
Messages
7
Location
24089
I'm looking at the venting requirements for my tub, toilet, and bathroom sink. This is on a concrete slab and has a main vent at the end of the main sewer line. All of the fixtures are about 3 feet from the main sewer line. The fixtures are about 12 to 8 feet from the vent stack but it's going to be difficult to tie into the vent stack. Do I need to add an air admittance valve to each fixture? If so how in the world could I add one to the toilet? Thank you.
 
I am not an expert in plumbing, but I've seen the term "wet venting" used in similar situations for toilets/showers, but you would need an experienced plumber to tell you if that's practical for your situation. I'm in CA so AAV's are a no go, but I understand they can be ok under a sink if a high-quality one is installed correctly.
 
Do you know what code and year edition your under?
Does your area require a permit?

A drawing would help but generally speaking based off of the 2015 IRC/IPC. A toilet does not require an AAV. The sink & tub fixtures may use an AAV.
 
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