2 sink vanity drainage question

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by JuanSigned, Jan 13, 2011.

  1. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    I'm underway on a gut and remodel of my master bathroom. The old vanity had one sink where the new one will have 2. The picture shows the framing for the new wall, the positions of the existing plumbing, and the blue tape on the wall shows the length (72") and position of the new vanity. I'd like some opinions of the best way to drain the new setup. To attach to the old stub out would require a 90 degree bend and there are already a number of bends in the wall.

    My questions are given a 1 1/2" drain and about 5' to the far P-trap does that require a vent for the far sink?
    bathvanity.jpg
    OR

    would I be better off to cut of the old stub and drain and vent it like this?
    bathvanity drain plan.jpg
    The first choice is a lot less work, but if my research is correct the 90 degree connection requires a clean out. (which I'd rather not do for aesthetic reasons) Bottom line is the drain system needs to work well and now it the time to do it right (ie the first time).
     
  2. dlarrivee

    dlarrivee New Member

    Joined:
    Jun 28, 2009
    Occupation:
    Foam/Fireproofing/Acoustical
    Location:
    Canada
    You're going to need to vent each fixture.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Your vent works for the right hand sink but not the left one. You have to do more research.
     
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    [​IMG]

    I think you will need to do something closer to this.
     
  6. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    Terry that's just what I was looking for, so much better and simpler than what I was thinking.
     
  7. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    Hey code guys, does this look OK? It's just dry fitted right now, no glue yet. All 1 1/2" ABS. The vent will connect directly out side and the lines have a definite slope towards the drain. I had a heck of a time finding a double sanitary T. The big orange box place didn't have them, had to go to a plumbing supply place and they had exactly one of them. (which is good because one is all I needed.) There no clean out in there, should I throw one in while I'm at it?

    bathvanitydryfit.JPG
     
  8. dlarrivee

    dlarrivee New Member

    Joined:
    Jun 28, 2009
    Occupation:
    Foam/Fireproofing/Acoustical
    Location:
    Canada
    I hope you glued that all together already. You can't dry fit abs without glue and then expect it to go together the same w/ glue, your measurements will be off.
     
  9. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    No glue yet, but everything is just a bit long. I'll cut it to size when I glue it up. First I wanted to work out the transitions to the existing plumbing.
     
  10. Basement_Lurker

    Basement_Lurker One who lurks

    Joined:
    Jun 21, 2007
    Occupation:
    I smash things and demand money.
    Location:
    Victoria, BC
    A double santee is exactly the wrong fitting to use and you are pushing the limits of the trap arm length with your right sink.
     
  11. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    Uh - so what is exactly the correct fitting to use? :confused: The fitting I'm using looks just like the one in Terry's photo (well its a little smaller at 1 1/2") And the right drain arm will be about 24" when installed. Is that too long? drainfitting.jpg
     
  12. dlarrivee

    dlarrivee New Member

    Joined:
    Jun 28, 2009
    Occupation:
    Foam/Fireproofing/Acoustical
    Location:
    Canada
    You want a double fixture fitting. It has baffles in it.
    [​IMG]

    You wont find one at Home Depot or Lowes or whatever...
     
  13. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    If nothing else this project is giving me new respect for plumbers. Threading long pieces of inflexible pipe isn't fun, and then there are those 9,000 different types of fittings. I hope the plumbing supply houses are open tomorrow.
     
  14. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    1.That fitting is NOT the same as the one in Terry's photo. He used a back to back fixture fittting, which has "sweeps" NOT baffles.
    2. It should be 2" from below the fitting to the connection to the drain system.
    3. You have absolutely NO WAY to unplug the line if it gets clogged.
     
  15. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    It's probably not totally up to code, but its better than what was there. I found everything I needed at Lowes :confused: (I'd stopped going there because their selection of electrical and building supplies wasn't as good as the orange box place.) Anyway, lets just say you can't trust anyone behind the counter or in the aisles of of the big box stores or the plumbing supply houses. The guy at the supply house said "sure that'll work!" when I asked him will the double sanitary T work for what I want to do. I guess I didn't ask him is this the correct fitting for two vanity sinks.
    bathvanityfinished.jpg.jpg


    Here is the double fitting fixture I used. Can someone share with me where you would use a double sanitary T? I held the two of them side by side and while they are different they are also very similar.

    BTW the camera angle is wonky those supply lines are actually parallel.
    drainfitting2.jpg
     
  16. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    A sanitary cross would normally ONLY be used in a vent system. The two fittings are only "similar" because they both have four openings, and if you CANNOT SEE the differences, then you will just have to trust us. And you still do NOT have any means of "snaking" the drain if it plugs up.
     
  17. JuanSigned

    JuanSigned Member

    Joined:
    Jul 27, 2007
    Location:
    Utah
    Sorry to bother you, just trying to learn.
     
    Last edited: Jan 18, 2011
  18. dlarrivee

    dlarrivee New Member

    Joined:
    Jun 28, 2009
    Occupation:
    Foam/Fireproofing/Acoustical
    Location:
    Canada
    They sure don't look the same to me...
     
  19. yngwie_69

    yngwie_69 New Member

    Joined:
    Sep 8, 2009
    Location:
    Prince Rupert, BC
    I think someone should have told him that if you snake one sink, the snake will go right through the 4 way fitting into the other sinks ptrap
     
  20. Willie Two

    Willie Two New Member

    Joined:
    Jan 1, 2011
    Location:
    British Columbia
    Just curious, is there a code requirement for the height the trap arm comes out of the wall if you did not know what the end resulting fixture profile is going to be ??
     
  21. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The only height requirement, is that the tail piece can't be too long, located on the same floor.
    Normally a 30" cabinet height for a lav would be 18" or so for the trap arm. As the counter height is raised, so can the drain be raised.
     
Similar Threads: sink vanity
Forum Title Date
Plumbing Forum, Professional & DIY Advice Ikea Odensvik Sink/Vanity with Non Ikea plumbing Apr 25, 2018
Plumbing Forum, Professional & DIY Advice Double vanity sink - Inspection Mar 28, 2018
Plumbing Forum, Professional & DIY Advice Dual Vanity Sinks Not Draining: New Install Mar 19, 2018
Plumbing Forum, Professional & DIY Advice MB Vanity Sinks/Shower Jan 3, 2018
Plumbing Forum, Professional & DIY Advice Convert bathroom vanity from single sink to double sink Aug 25, 2017

Share This Page