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Old 07-18-2011, 11:24 PM   #1
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Rerouting Plumbing Vent


My wife and I started a project of removing a section of an L-shaped wall that separates the kitchen and dinning room. We plan to turn it into a island attached to the wall as shown below. The problem is there is a sewage vent running through the wall. The vent is 1 and a 1/2 inch copper pipe and runs from the basement, through the demolished wall, into the attic, and out the roof.

The cheapest method I think would be to put an air admittance valve on it and patch the hole in the roof, Option B below. The wall that will be left is load bearing, drilling 1.5" holes through the studs just doesn't seem structurally sound, Option A below.

Any advise on rerouting a plumbing vent would be great!


Wall before removal


Option A


Option B

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Last edited by Blauvster; 07-18-2011 at 11:27 PM. Reason: added aav wiki link
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Old 07-18-2011, 11:38 PM   #2
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why not option A, except make the offset below the floor and not in the wall

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Old 07-18-2011, 11:57 PM   #3
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Thanks for your input TheEplumber.

The basement is finished, so I would have to open a wall to do so. I am trying to avoid that as well.

I am thinking my best bet for Option A would be to take the pipe somewhat through the storage area in the island. The island will be comprised of 2 shelves on slides for the most part. So I could probably get away with not having to go through the vertical supports in the load bearing wall. But I would still have go through the 3+ 2x4s comprising the top of the wall. Even beginning the new route in the basement I would have that issue.

A third option could be to make the wall thicker to allow the vent to go up with no need to go through the load bearing wall.

Anyone have an input on AAVs? I know there was one in our old apartment.
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Old 07-19-2011, 12:12 AM   #4
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AAV's are accepted in some areas, but I avoid them when possible. Why use something mechanical? But thats me..
I bet if you get creative, you can move that vent
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Old 07-19-2011, 10:35 AM   #5
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What size are the studs?
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Old 07-19-2011, 12:28 PM   #6
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They are all 2x4s or 1.5"x3.5"s.

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