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

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by bsj8377, May 14, 2014.

  1. bsj8377

    bsj8377 New Member

    Messages:
    16
    Location:
    Ohio
    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 :(

    Attached Files:

    Last edited: May 14, 2014
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,835
    Location:
    Cave Creek, Arizona
    NO!!! You either raise the pipe in the wall or eliminate that drawer.
  3. Reach4

    Reach4 Well-Known Member

    Messages:
    2,432
    Location:
    IL
    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.
  4. bsj8377

    bsj8377 New Member

    Messages:
    16
    Location:
    Ohio
    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?
  5. bsj8377

    bsj8377 New Member

    Messages:
    16
    Location:
    Ohio
    The horizontal stubout goes for about 18" to the right to the san-t drain/vent...
  6. Reach4

    Reach4 Well-Known Member

    Messages:
    2,432
    Location:
    IL
    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
    Last edited: May 14, 2014
  7. bsj8377

    bsj8377 New Member

    Messages:
    16
    Location:
    Ohio
    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?
  8. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,249
    Location:
    Land of Cheese
    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.
  9. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

    Messages:
    679
    Location:
    Houston, Texas, United States
    Put a 22 degree turn to the left as it comes out of the wall, that should line up just right
  10. bsj8377

    bsj8377 New Member

    Messages:
    16
    Location:
    Ohio
    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...
  11. Terry

    Terry Administrator Staff Member

    Messages:
    15,130
    Location:
    Bothell, Washington
    Yeah, we got you. Not code, and the trap siphons.
  12. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,249
    Location:
    Land of Cheese
    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.
  13. bsj8377

    bsj8377 New Member

    Messages:
    16
    Location:
    Ohio
    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 :)
  14. bsj8377

    bsj8377 New Member

    Messages:
    16
    Location:
    Ohio
    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?
  15. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,249
    Location:
    Land of Cheese
    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.
  16. Terry

    Terry Administrator Staff Member

    Messages:
    15,130
    Location:
    Bothell, Washington
    [​IMG]

    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.

    [​IMG]

    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.
    Last edited: May 18, 2014
Similar Threads: Need help
Forum Title Date
Plumbing Forum, Professional & DIY Advice Help needed - non standard size tile shower install Wednesday at 12:51 PM
Plumbing Forum, Professional & DIY Advice Need help identifying shower cartridge Aug 25, 2014
Plumbing Forum, Professional & DIY Advice Need help with shower faucet ID Aug 20, 2014
Plumbing Forum, Professional & DIY Advice Need help with adding tub drain and vent Aug 10, 2014
Plumbing Forum, Professional & DIY Advice Help me ID what I need for garden tub faucet install? Jul 26, 2014

Share This Page