Venting options for bathroom remodel

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Mark1400

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I am doing a bathroom remodel on a second floor and will be moving the toilet and sink locations. I will be able to access the floor joists from the first floor to run new drain pipe, then run it down to the basement through a closet. But I don't see how I can connect to existing vent stack. The layout of my plumbing will be similar to this picture. My question is can I use an AAV in the sink cabinet instead of connecting to the vent stack?
Slide1.jpg
 

Tuttles Revenge

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If your local code allows AAV, then Yes, that configuration would be a Vertical wet vent. If you tied in the sink to the 3 horizontally it would be a Horizontal wet vent. Both would be fine. The AAV would be located above the san tee at the sink a minimum of 4" above the trap. It needs to be accessible because it is a mechanical device that requires maintenance and replacement. It also requires free access to air in order to function properly.
 

Mark1400

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Thanks for the feedback. If I have dual sinks, each going into the 3" line separately (the vanity layout may prevent a combined single drain into the 3" line), then I assume will still just need one AAV?
 

Terry

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Unless the sinks are connected at the same level, as with a fixture cross, they will need their own venting (AAV) which gets plumbed at least 4" higher than the trap arm, accessible for replacement and for air intake.
 

Mark1400

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If your local code allows AAV, then Yes, that configuration would be a Vertical wet vent. If you tied in the sink to the 3 horizontally it would be a Horizontal wet vent. Both would be fine. The AAV would be located above the san tee at the sink a minimum of 4" above the trap. It needs to be accessible because it is a mechanical device that requires maintenance and replacement. It also requires free access to air in order to function properly.
A follow-up question on this. In this configuration, does the angle that the
Thanks Terry!
One more question on this (doing more research to better understand wet vs dry vents!) I came across this diagram in an article, and want to confirm that in my scenario, I should have the sink drain enter into the main horizontal drain as shown for the wet vent, i.e. it would come in horizontally (from side) vs from top?
wet  vent.jpeg
 

Tuttles Revenge

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Correct. for a horizontal wet vented system the fixtures come into the side horizontally.

I can't corraborate this in code, but I had one inspector say also that horizontal for the pursopose of wet venting is min and max 1/4"per foot. That maybe debatable in other jurisdictions, but that is how we run ours.
 
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