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PADIY 01-17-2009 06:08 PM

AAV Shower Question
 
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I'm installing a shower into a master bath I'm working on in my attic. The shower is too far from my waste stack and other fixtures to tap into any venting on that end. To vent the shower traditionally is going to be a major problem. My question is whether what I have planned with an AAV would work. I'm looking to run an AAV in a stud wall for a closet (with vent for airflow). I'm in PA and AAVs are allowed by code. I've included a (crappy, approximate, and N.T.S.) diagram with what things look like. My trap for the shower is so far away because there's a raised ceiling just below the shower area for about 4 feet of the run. Thanks!

ponch37300 01-17-2009 08:00 PM

I'm not a plumber but i don't think you can put an AAV in the wall. Hopefully someone will confirm or disagree with this for sure. I would call you local building inspector and ask him to be sure

Termite 01-17-2009 11:13 PM

Most...Not all, most...Inspectors will allow an AAV in the wall provided that it is accessible and it can breathe. I'll allow it if an HVAC-type louvered grill is used.

PADIY 01-18-2009 10:09 AM

That's why I said "(with vent for airflow)". It's in a closet, so I was going to cut a hole in the wall and put a grille there to keep air flowing to it. Still, anyone know if my plans will work?

PADIY 01-19-2009 10:36 AM

My question wasn't really pertaining to the AAV in the wall itself, but the AAV's position in the line and whether it would vent properly if run off of that 45 and far away from the trap.

zosoplumber 01-19-2009 07:51 PM

You need your vent line before the p-trap. The way you have it, once the flow of water is past the p-trap, it would have to pull air through the p-trap from your AAV, which would suck your p-trap dry.

Daltex 01-19-2009 08:40 PM

Agree with the AAV street side of the trap or the drain water will pull it dry.

II Weeks 01-19-2009 10:00 PM

can you fit the trap under the shower stall drain? then you can run your AAV the way you want

PADIY 01-20-2009 05:49 PM

Quote:

Originally Posted by zosoplumber (Post 215857)
You need your vent line before the p-trap. The way you have it, once the flow of water is past the p-trap, it would have to pull air through the p-trap from your AAV, which would suck your p-trap dry.

I had a feeling this was the case. This way surprisingly makes things easier for me. Thanks everyone for all the input!


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