l2john@att.net
I have a dual sink drainage issue. I am in near completion of our bathroom renovation. It originally had a dual sink vanity. Each sink had it’s own p-trap leading to the same drain. The configuration is exactly the same. I am not sure how it was before, but now, when the sink to the left drains, water comes up the drain on the right side. Same goes when draining on the right side, the water comes up the sink on the left.
“Each sink had it’s own p-trap leading to the same drain.” is a typo meant to type:
Each sink HAS it’s own p-trap leading to the same drain.
That does not sound very sanitary.
Check and make sure you don’t have any clogs or blockage in the common drain pipe. Sometimes spackle or paint can get dropped in a drain during a remodel and cause problems.
sounds like you got the p traps in the wrong spot, they go right under each drain
Here’s something I came up with:
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Good luck. I know plumbing sucks but when you get the right person to help it makes it so much easier!
Sounds like you have a partial blockage of the pipe just past the p-traps. It does not sound like you did anything wrong. It backs up because it can’t flow fast enough down the drain. I would remove the p-traps and snake out the drain.
It’s possible that you have your drain pipes running too level, allowing it to drain across instead of down.
If you only had one P trap,like a kitchen sink does, that would allow the drain on one sink to vent through the other sink and drain a lot faster.