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Old 05-26-2012, 04:20 PM   #1
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Air Admittance Valve in Basement Bathroom


New to the forum and appreciate any help.
I am installing a full bath in my basement. As seen in pic I have a 4" cast iron vertical waste stack that goes to outside of house and also horizonal under slab along basement wall. I want bathroom to start a couple feet from stack and in this order from stack; Toilet, Sink and Shower. Where in this configuration do I put the Air Admittance Valve? Thanks so much for any advice.
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Old 05-26-2012, 04:36 PM   #2
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Air Admittance Valve in Basement Bathroom


how far away is shower trap from sink.
also what is on the horizontal and vertical stack

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Old 05-26-2012, 07:02 PM   #3
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Air Admittance Valve in Basement Bathroom


The cast iron stack is connected to a full bath on the next floor. The horizontal run from the stack under the slab in the basement is connected to a washer drain and floor drain only. The stack vents to a 3" pipe through the roof. Vent is hard to access and also I dont think it can handle the new full bath in basement.

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Old 05-26-2012, 07:09 PM   #4
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Air Admittance Valve in Basement Bathroom


how far from sink is shower going to be?
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Old 05-26-2012, 07:23 PM   #5
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Air Admittance Valve in Basement Bathroom


Toilet, sink and shower will be in line (next to each other) at just a little more than minimum code requirements.

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Old 05-26-2012, 07:29 PM   #6
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Air Admittance Valve in Basement Bathroom


depends on code if you are worried about it. i would put aav under sink and let it be a wet vent for shower and the toilet is fine
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Old 05-26-2012, 07:36 PM   #7
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Air Admittance Valve in Basement Bathroom


Jay,

I am curious why the aav would be at middle fixture as opposed to, say at one end of the branch? I don't do much plumbing so I just dont exactly understand why the sink? Is it because the trap for the sink is the highest trap in the branch?

Thanks for your help!
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Old 05-26-2012, 08:09 PM   #8
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Air Admittance Valve in Basement Bathroom


it would be like running the vent straight up and arming over to catch a shower then continuing up to catch sink with a t then vent going up through roof . also sink is highest fixture . you could put one for shower and then another for sink. toilet is self siphoning so it well drain through vent stack
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Old 05-26-2012, 08:19 PM   #9
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Air Admittance Valve in Basement Bathroom


Jay,

Sincere thanks for your expertise.

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