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Old 02-28-2017, 06:39 AM   #1
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Moving Sink Drain Pipe


Hi all,

I'm in the middle of installing a new vanity in a small half-bath. The issue I'm running into is the drain stub coming out of the wall is way too low to hook up a P-trap.

I've tried several different solutions and have run into a dead end every time. It looks like the best thing to do is to open up the (freshly drywalled and painted) wall and move the drain pipe up about 4 inches.

The sink drain pipe is 1-1/2" PVC that elbows out of the wall at the sink location then runs horizontally about 3 feet then tees into the toilet vent pipe inside the wall.

What's the best way to move the drain stub once I cut into the wall? Can I simply cut the existing 90 elbow off, add a 90 elbow pointing up then add a short length of straight pipe, then 90 elbow out the wall? Would doing this kind of create an S-trap inside the wall?

Thanks!
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Old 02-28-2017, 07:28 AM   #2
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Re: Moving Sink Drain Pipe


Quote:
Would doing this kind of create an S-trap inside the wall?
Yes.
You will have to cut the vertical pipe (drain and vent) and move the tee and the horizontal pipe up the desired distance.
Since I suspect that the real desire here is to get enough height to install the trap above the vanity drawer, measure carefully. Don't get it too high such that you don't enough room between the sink drain and the stub out for the trap.

I suggest installing the sink drain assembly and the trap to the vanity top, sitting it in place temporarily to see what the maximum height for the stub out. Also to insure that everything will fit above the drawer.

Something you could think about before you cut into the wall.
(Now I haven't thought about this very much either).

It looks like you have enough room between the drawer and the wall for a trap. Cut the stub out about 1 1/2" from the wall. Put a glue up PVC trap flat against the wall. Pipe from the sink drain with what is essentially compression fit trap arms.
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Last edited by hkstroud; 02-28-2017 at 07:58 AM.
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Old 03-01-2017, 09:20 PM   #3
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Re: Moving Sink Drain Pipe


Hi hkstroud, appreciate your reply.

I had a gut feeling that was probably the correct way to go to properly resolve the issue. Unfortunately, that's a bit more drywall and paint than I want to do.

I decided to remove the bottom shelf and drawer assembly which gave me enough room for a proper P-trap. I hated to hack up a brand new vanity, but quicker and easier than cutting out half a wall of sheetrock, re-plumbing, etc.

Thanks!
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Old 03-01-2017, 10:20 PM   #4
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Re: Moving Sink Drain Pipe


I must have not conveyed my thoughts very well.

It looks like you have enough room between the back of the shelf/drawer and the wall for a trap to fit parallel or flat against the wall without modifying the cabinet or the wall.
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