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Author:
aariel_us (NY)
I'm trying to add two vanities in a 1st floor bathroom in an old farm house--so this is a retro fit.
They ultimately need to tie into a horizontal 3 in sewer pipe with about a 16 in horizontal run to said pipe.
I believe I have to have a wye, as opposed to a sanitary tee, in the 3 in sewer pipe since it's horizontal.
I've only got about 8 inch of vertical clearance from the wye to the subfloor.
I'm planning on tying both sinks with a 1-1/2 sanitary tee.
My question is about venting and the trap.
I'm thinking of venting into the interior wall where the sinks are and want to have a single trap, right under the tee, in the basement to protect the vent from gas. I realize this is probably not up to code, but I don't see any other way to have a vent. There is no other way to have the opening of the vent higher than the drains in the sinks.
I assume that having a single trap for both sinks down in the basement is ok at least from a physics POV, not sure about code.
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Author:
packy (MA)
idealy you do something like this..
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Author:
aariel_us (NY)
Understood. I dont have the luxury of looking at studs. My problem is that vent pipe in my application can't punch through the envelope to the outside. So I'm planning on just running enough pipe in the interior wall rise above the drains.
The 3 in waste line ties into a vented 4 in vertical. But I assume I need a vent at the sinks as shown.
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Author:
aariel_us (NY)
I think I'm just going to install AAVs for each sink. More code complaint and easier to troubleshoot in the future.
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