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About Dana Bostick
Expertise
Pretty much any residential plumbing questions. Note: I live and work in Southern California. We do not as a rule use boilers, hot water or steam heating systems or wells so my knowledge in those areas is limited. There are others here that can probably answer those questions better. "We all is city folk" out here! What is a "well" LOL

Experience
Licensed General Contractor with Plumbing, HVAC and Electrical sub-licenses

Publications
SearchWarp, Article Alley, www.DIYHomeInspection.blogspot.com

Education/Credentials
30 years in the trades

You are here: Experts > Home/Garden > Home Improvement/Repair > Plumbing in the Home > double sink problem

Plumbing in the Home - double sink problem

Expert: Dana Bostick - 11/1/2009

Question
I have a double sink and when I drain one it backs up in the other sink. Only one sink has a trap and the other has a pipe going over "straight" over to the other sink drain before the trap in that sink.
My question is should I put a trap in the sink that doesn't have one to stop it from backing up into the other sink?

Answer
Hi Terry,
Nope, you can't do that. Only one trap is allowed per drain line. The draining water is taking the path of least resistance. That means that the drain line in the wall, past the trap, is probably partially clogged and needs to be snaked.
Good Luck,
Dana

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