Where are the vents?

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Yinn

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It started off with just doing some demo, and it turned into question marks. This is a double vanity, and based on what I can gather it may not be piped appropriately. The sanitary tee in a horizontal position was a tip.

Sink 1: 1.5”
Sink 2: 1.5 x 1.5 x 2.0 Sanitary Tee
Vent Stack: 2”

FC15E2A0-989F-47F9-9534-EEA1630D993E.jpeg


I was under the impression that each trap requires a dedicated vent. This would seem to me as it’s sharing a vent. Am I wrong?

It’s a first floor bath, with full basement access. The wall is a load bearing exterior wall, so there are limits on how much I can drill out, but I was thinking about adding a 1.5” pipe like this to allow venting. Hoping for a sanity check before I proceed.

EF2969B1-4F77-406A-852C-3C6B54BBB29E.jpeg


And of course I have to cut out and replace the sanitary tee with a wye.
 

Yinn

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Wouldn't that just make it a horizontal wet vent?

That was my impression as well. The best guess would be that you can’t have a set vent be the dry vent?

No matter what you do for venting #1, #2 will NOT be vented because the other one drains past its connection.

There has to be some way to replumb this so it works right? I guess I could look into aav if not.
 

Reach4

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There has to be some way to replumb this so it works right? I guess I could look into aav if not.
IMG_5.jpg


This could be one way. There are other ways. The wye could be a santee if that fits OK. The right-hand trap adapter could also be a santee, and get rid of the existing santee. The right santee with trap adapter would feed into a combo, and its waste would join the other drain.
 
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OLD TIMER

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its that easy.
 

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OLD TIMER

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View attachment 54150

This could be one way. There are other ways. The wye could be a santee if that fits OK. The right-hand trap adapter could also be a santee, and get rid of the existing santee. The right santee with trap adapter would feed into a combo, and its waste would join the other drain.
You've created an s-trap.
 

Reach4

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You've created an s-trap.
Are you referring to my picture with the pink line? The pink is a drain line from the left trap adapter, which is on a new santee. The yellow arrows represent a vent line into the top of a new santee . That was already present in the drawing that I marked up.

The traps will be outside of the wall. The right-most trap adapter will be vented at the existing santee.

I presume the vent line on the far right is dry until the santee.
 

OLD TIMER

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My mistake. now I see what your doing. my eyesight's not so good.
 

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