Need help with stubout for lavatory...can I relocate?

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bsj8377

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Hello,
Ok, so the stubout for my lavatory in the basement bath was set BEFORE the vanity was chosen...I know, bad move....or rather, a different vanity should have be picked. However, one of those vanities that looks like a dresser was bought and it has the second drawer cut out in the center to leave room for the P-trap and plumbing. The problem is, the stubout is too low, so what's happening is the P-trap is ending up "inside" where the bottom drawer would be!

So, what I'm wondering is if it's possible/ok to raise the stubout by adding a 45 degree fitting (or even a 22 degree) in the horizontal section in the wall leading to the vent/drain line? Will this work and be acceptable? Here is a picture of what I have...and I tried to draw in my proposed fix. I'd like to add a 45 degree fitting to the horizontal section in the wall, which will raise the stubout and also get me close enough to attach the tailpiece...is this allowed? Will it work? Here's a picture... (disregard the second picture, was a mistake, just consider the one with the 90 degree)

drain.jpg

Any help would be appreciated...I gotta have something done with this by morning :(
 

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Reach4

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Look through your hole for the vent pipe and report that if you can see it. What you suggest is not going to work, but if there is a vent pipe hidden by the drywall just right of the hole, there is a way to do it right.

Otherwise you will need to notch out an area of the back of your drawer to clear the trap.
 

bsj8377

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I was afraid of that...the second problem is that I can't even reach the tailpiece, so I have to at the very least extend the pipe in the wall...can I use a fernco for this?

Or, can I come out of the wall at a different angle toward the tailpiece? Or does it have to be a 90?
 

bsj8377

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Look through your hole for the vent pipe and report that if you can see it. What you suggest is not going to work, but if there is a vent pipe hidden by the drywall just right of the hole, there is a way to do it right.

Otherwise you will need to notch out an area of the back of your drawer to clear the trap.

The horizontal stubout goes for about 18" to the right to the san-t drain/vent...
 

Reach4

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So that means through a stud, I guess.

You could probably use use an AAV. I think it has to be accessible.

Attached is an idea. Green is elbow up of right kind.
red is 2 inch pipe ir 1-1/2 as appropriate
black is tee to horizontal pipe
Orange is that pipe, but its left side is out of the wall as required.
blue is AAV covered with vent cover or uncovered. Locate high as practical under sink.
Attach P-trap to orange pipe.

Not a pro. Just an idea.
huge2.jpg
 
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bsj8377

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Hmm...that might be more work than it's worth... :)

At this point I'd be ok if I could just get the tailpiece to mate up to the p-trap...

I got this kit with all the pieces to hook it up, but as you can see I'm too far off...I need like a 45 between the stubout and the p-trap...

Any suggestions for how to get this tailpiece to meet the stubout? Is there a different kind of P-trap that might have a longer curved section?
 

Cacher_Chick

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You can cut the 90 and move it or change it to 45's, but you cannot jog the pipe up between the trap and it's vent.
 

bsj8377

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You can cut the 90 and move it or change it to 45's, but you cannot jog the pipe up between the trap and it's vent.

Hmm, ok, just to clarify, I was wanting to move the whole p trap assembly up, and go straight to the wall like normal, then the drain line would drop at a 45, then level out out for about 8 inches and then dump into the vent/drain line...

The pipe would NOT go UP between the p trap and horizontal drain line in the wall...
 

Terry

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Hmm, ok, just to clarify, I was wanting to move the whole p trap assembly up, and go straight to the wall like normal, then the drain line would drop at a 45, then level out out for about 8 inches and then dump into the vent/drain line...

The pipe would NOT go UP between the p trap and horizontal drain line in the wall...

Yeah, we got you. Not code, and the trap siphons.
 

Cacher_Chick

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There can be no up or down jog in the trap arm. I must be straight a straight shot pitched 1/4" per foot between the trap and vent. Anything else will cause a siphoning problem, not meet code, and fail inspection.
 

bsj8377

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Got it. Just installed two 45's instead of the 90, that got me where I needed to be to attach the drain. Just have to cut out part of the bottom drawer, not ideal, but I learned for next time :)
 

bsj8377

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Come to think of it, what would be the best height for a rough stubout that might be able to accommodate both styles of vanities? Is there a specification for how long the drain has to be before the p trap starts...or can the trap be put as high as needed?
 

Cacher_Chick

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The height is dependent on how high the sanitary tee is roughed in the wall. About 20" off the subfloor is right for most, but not all.
 

Terry

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bonheur_05.jpg


This lav drain was raised because the new cabinet, 36" high countertop has a drawer below.
There is also a drawer bank to the right.

gruwell_01.jpg


Here is a third lav added by wet ventingj two previous lavs. The wet vented portion is 2"

Sometimes you just cut the wall and move the pipes.
 
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