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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.
 

Joe.B

Registered User
Joined
Dec 4, 2020
Messages
103
Location
Arcata Ca
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.
 

Keystone

Sawhorse
Joined
Feb 23, 2010
Messages
1,012
Location
Lehigh Valley, Pennsylvania
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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