Please Help with Kitchen Sink Plumbing! Waste Pipe is too high

jjunkers

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OK, I know the first thing everyone will say is open the wall and lower the waste outlet. I have looked all over the internet and that seems to be the best way.

HOWEVER... Is there any way that I can make this work without doing that?? The cabinets are brand new and i would hate to tear them apart like that, plus I am on the bottom floor of a 3 story condo so I don't know if I could do that myself.

I can't raise the p-trap much because i have the fitting that the dishwasher connects into. Any ideas?
 

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You couldn't make that connection work, properly, even if you eliminated the dishwasher connection. That is either a horribly deep sink or a very, very high drain in the wall. The only way to make it work is to either raise the cabinets or lower the drain line, and from its appearance, to lower it you will have to take out more than one cabinet. Someone did not do their homework BEFORE installing the new cabinets.
 
Behind the cabinet is a 4" thick wall that faces the living room. I could probably open the wall on the living room side to fix this right? In a 3 story condo are the drain pipes shared with the floors above? If so, how does one go about lowering the drain line?
 
You won't know for sure until you open it up. If your drain connection in the picture connects directly to a stack serving he upper floors, you will have to arrange for them to NOT use the drain while the work is in progress. If the stack is cast iron, I would rule out any DIY on that. You will need a plumber. Even if it is plastic, you don't know how well the stack is supported!

The reasons you can't use your sink as is:
► if you were to eliminate the DW and raise the trap, it would drain, but you would tend to have standing water in the sink at times.
► if you left the trap as is and raised the outlet to join at the wall, that would be a VERY deep trap and would drain very slowly.
 
In addition to the above, there would be absolutely no way to prevent the dishwasher from siphoning dirty water back into the dishwasher EVERY time it was used, even if the hose were looped up to the underside of the countertop. An air gap would not help because that would overflow everytime the dishwasher drained because of the back pressure of the water in the trap.
 
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