I have a kitchen in basement. When kitchen sink up stairs is used , water backs up in sink down stairs.?

Question

When water in up stairs sink is turned off, water goes down in sink downstairs..

Answer 1

you have a clogged line, probably below the concrete near the basement sink. Have it snaked out, with 2 kitchen sinks sharing the same line, I'll assume it's grease. If they both have a garbage disposal, food particles too. You may be able to use a liquid drain cleaner. For this I'd recommend flow easy, Lowe's sells it. Just follow the directions exactly. I doubt it is a vent problem if this has never happened before and no other fixtures are acting up.

2 sinks at different levels can most certainly share the same vertical piping, they call it a waste stack. In this case, the waste stack would need to be 2" pipe, minimum. Multi story buildings are commonly designed this way. Smaller scale with a house, but still meets same code requirements.

Answer 2

Only two things will cause this,
The air vent stack may plugged which allows an air bubble to form in the drain pipe. This is the cause of most slow moving drains that won't respond to cleaning.

The blockage could be from old food build up, rust, etc. at the spot where the drain and vent connect, or something like a bird, tree leaves, or wasp have entered the pipe and are blocking it.

To clear it, try running a snake down the vent stack on top of the house all the way to the drainage pipe.

The second cause will be the drain pipe won't carry the volume of water you are releasing in the up stairs sink. Again this could be caused by build up of food particles in the pipe, rust, or the drain pipe just being too small.

To improve it, find the drain clean out plug, and run a snake down it. If that doesn't help, then call a plumber to replace the drain pipe with one large enough to carry the volume you have.

Answer 3

It is obvious, that the two sinks are on the same line. If the downstairs sink, is tied directly to the waste line coming from the upstairs sink, the piping is incorrect. The sinks need to have separate lines, that connect with an "H" fitting. It sounds like another problem, created by someone performing plumbing, without a license. ANY PLUMBER knows that! I would have a plumber come check out the piping arrangement, and correct any deficiencies he finds. Good luck!

Answer 4

I would say that the drain is undersized or possibly, the fittings are not the proper type. Drainage fittings (DWV) "steer" the liquids in the proper direction in the piping. You may also have a partial clog in the piping just after the basement sink pipe. This would cause water to back-up into the basement sink. If you hear or see air bubbles in the basement sink, it is a vent problem.

Answer 5

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Answer 6

The drain lines either are'nt vented properly, or you have too many fixtures on one vent.
Consult a plumber, they will have a solution.
Good luck!!!

Answer 7

Sounds like they use the same drain. Call a plumber. They’ll put in a valve to stop the back up.