Hello

I'm apologizing before I ask the question as I do not know all proper terms when dealing with plumbing.

My question is right now my kitchen drain has a "p" trap going into a 45 then runs behind my kitchen cabinets into the wall where I believe it runs into the main pipe. Because I live in a semi and the wall behind the sink is the joining wall the pipe cannot run into the wall and then into the main pipe so that is why I think it runs behind the cabinets. I am remoldeling my kitchen and I want to run my drain after the trap down into my basement ceiling and then across to my main pipe and just want to know if this will cause a problem and will it meet all codes. The only other thing I want to add is where I want to join my drain into the main pipe there is a 45 just after where the connection would be made.

I would appreciate all the help someone will give me and any suggestions people have.

Thanks
Kevin

Could you take another shot at stating this issue "Because I live in a semi and the wall behind the sink is the joining wall the pipe cannot run into the wall and then into the main pipe so that is why I think it runs behind the cabinets. " If you want your drain to turn downward after the trap and go to the basement it sounds like an illegal S trap. Please explain further.

To clarify the point, the wall behind the sink is a fire coded wall and is a brick wall so the drain is run along the wall through my kitchen cabinets and they have cut up all the cabinets to run the drain to the main pipe that is in an interior wall. I basically want to know a legal way to run the drain from my sink down into the basement ceiling and across to the main pipe. Is this possible or do you know or any other way I can do this?

OK to avoid making this into a S trap I would install a verticle 1 1/2" pipe just before the wall going staright down to an elbow in the basement. This verticle pipe would reach up almost to the top of he cabinet cavity and terminate with a air admittance valve (AAV) you tap into this verticle pipe with a sweep 90 elbow.

Sorry to be a bother but I am having a hard time picturing this, would it be too much to ask for a simple line diagram? Sorry to be a bug!

Sorry, I'm using a very small portable computer and don't have much graphic capability. Currently you horizontal drain after the trap enters the pipe running through your cabinets. Eliminate that pipe completely. Drill a 2" hole through the floor of the cabinet near the back wall and stick a 1 1/2" drain line staright up and down so it reaches your basement. Put a sweep 90 degree elbow on top of this new pipe and run your trap into it. Put a AAV above the elbow. Sorry, best I can do with my limited computer skills, I'm good with a wrench not a keyboard.

I really appreciate all your help and I think I now understand. Attached is a drawing of what I think you are saying. I'm not the best with drawing but I think you can get what I mean from the picture. Please let me know if I have understood you correctly. Thanks for all your help again!

Attachment 11090

Bob's off line, Let me answer for him. Your drawing's pretty much what Bob had in mind. Maintain 1/4" to the foot slope, install a sweep or two 45's to transition from vertical to horizontal and a sanitary tee to tie into the stack. Good luck, Tom

Yep you did understand my convoluted description, Tom's comment helped too. I failed to mention the 1/4" slope to the wall. I see you even added the AAV in the right place. It may or may not pass code in your area. Ask first if this job will be inspected by the building department.