Double vanity from single

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by nc8861, Jul 30, 2008.

  1. nc8861

    nc8861 New Member

    Messages:
    36
    Location:
    North Carolina
    We had a single sink vanity in place. Now we're remodeling and will be getting a 60" double sink vanity. Unfortunately I cannot use the stubs/drain that are existing, because the vanity has cabinet/drawer vertical supports that are right where the current supplies stub out.

    Can someone tell me how to go about resolving this? I can sweat pipes and know about the fittings for the drain, and the tees, elbows, etc. My main concern is the layout & design - I really don't want to mess with the main drain line or the main vent stack - I want to tie into those. With the drain line - I'll have to drill large holes through several studs to pass the ABS drain through to both sinks. What is code restriction on size of holes to drill through studs? And how many holes can I drill and how far vertically between each hole? I'll have to drill holes for hot, cold, and drain.
  2. nc8861

    nc8861 New Member

    Messages:
    36
    Location:
    North Carolina
    I should also note that this is on an exterior wall. The supplies are in that wall, and the current drain line is drilled through a 2x4 stud to get over to the vent.
  3. sjsmithjr

    sjsmithjr Geologist

    Messages:
    295
    Location:
    Knoxville, Tennessee
    Are you going to notch or bore? I'll assume notch since I can't see you passing drain pipe of any length through existing stud walls.

    25% notch is allowed for an exterior or bearing wall. Since a 7/8" notch won't do you much good, you'll need to use a stud shoe (Simpson HSS/SS series or equivalent) to reinforce studs notched for the drain pipe.
  4. Southern Man

    Southern Man DIY Hillbilly

    Messages:
    530
    Location:
    North Carolina
    With pre-made cabinets you can usually hack out big chucks of the sides near the back to make room for the drain line. That wy you don't mess with the wall at all. There's usually a lot of room behind the drawers as well- or you can always shorten a drawer. If you can do that the supply should be easy.

    I'm not sure of the Code requirements for plumbing two vanity drains together with a common vent but I've done it before and it worked fine.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,631
    Location:
    Cave Creek, Arizona
    sinks

    I'm not sure of the Code requirements for plumbing two vanity drains together with a common vent but I've done it before and it worked fine.

    By that I assume you used the "if it fits and works it is okay" method of plumbing. A plumber will make the necessary revisions to the drain system. To do it correctly may mean reworking the drain riser, but that is seldom an issue to a competent worker.
    [​IMG]
Similar Threads: Double vanity
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & double sink vanity rough plumbing -- please check my plan Jul 29, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Need Advice / Professional Guidance on Double Vanity DWV Apr 9, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Rough Plumbing Double Vanity Feb 11, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Double sink vanity drain issue Nov 7, 2013
Plumbing Forum, Professional & DIY Advice, Tips & Double wye used for double vanity Aug 5, 2013

Share This Page