(206) 949-5683, Top Rated Plumber, Seattle
Page 1 of 2 12 LastLast
Results 1 to 15 of 19

Thread: Single to double vanity - better way? Illinois

  1. #1
    DIY Junior Member john-ee's Avatar
    Join Date
    Jan 2010
    Location
    IL
    Posts
    3

    Default Single to double vanity - better way? Illinois

    Hi,

    Thanks for the great forum and advice. I'm looking to move some supply lines to transition from a single to a double vanity. The picture below is self-explanatory about what I'm thinking and I'd appreciate some experienced input to validate my plan. The drain used to be in the center of the existing supplies and I've already reconfigured it for the dual sinks with the added vent line. There is a 28" run from the left 1-1/2" drain to the center vent so I think I'm OK in that regard. I saw Terry's double vanity example picture with the black PVC drains and started down that route but I hit a snag when I realized that I didn't have quite enough space for everything to fit comfortably when overlapping the 1/2" supplies. There's only enough room for one supply in front and one supply behind the PVC. I then wanted to just move the tees below and create two new lines off of the 3/4" below, but the finished ceiling, the duct work, and the beam make that harder than I'd like. Does what I propose look unprofessional and if so, could you help me with something that works better?

    Thanks,
    -John-

    Name:  Bath 005.jpg
Views: 2894
Size:  49.4 KB

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,195
    Blog Entries
    1

    Default

    No plumbing inspector would pass that setup.

    Normally a plumber would use a double fixture fitting on a double lav, this way both lavs would be vented.

    Last edited by Terry; 01-03-2010 at 08:57 PM.

  3. #3
    DIY Member wallskev's Avatar
    Join Date
    May 2009
    Location
    North Carolina,USA
    Posts
    72
    Blog Entries
    1

    Thumbs down Becasue is not a resaon why !

    Terry:
    Would it be better to give a short reason why, other then a statement such as "No plumbing inspector would pass that setup."..

    This person nees to know "WHY" and if possible, like he stated " .....and if so, could you help me with something that works better ..."
    Kevin

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,624

    Default dwv

    "No inspector would approve that setup", period. The only sink "vented" is the left one. The left sink flows past the right one negating the effect of the vent on that trap. As far as the water piping is concerned, your drawing will work, although it seems to be much more complex than necessary.

  5. #5
    Plumber Cass's Avatar
    Join Date
    Nov 2005
    Location
    Ohio
    Posts
    5,984

    Default

    You weren't thinking about it you did it...it's all cut and glued up....we don't know what state and or city you live in so we would have no idea what would pass and what wouldn't....

  6. #6
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,624

    Default code

    Pass/fail depends on the code, and some of them are very lenient when it comes to hydraulic issues.

  7. #7
    Previous member
    Join Date
    Jul 2009
    Location
    North of the Mason dixon Line
    Posts
    1,150

    Default

    Besides the vent issue, how many fixtures are on those 1/2" lines?

  8. #8

    Default

    it would probably pass where i live if the arm was 2'' pipe. your tee for your vent should be the other way
    Last edited by RTAPlumbing; 01-03-2010 at 05:04 PM.
    Thanks,
    Taylor Allen
    Website: http://www.rtaplumbing.com

  9. #9
    DIY Junior Member john-ee's Avatar
    Join Date
    Jan 2010
    Location
    IL
    Posts
    3

    Default

    Thanks for all of the replies.

    The drain is glued and done, but I'm certainly not opposed to cutting out a few dollars worth of fittings to do it right. I'll use a double fixture tee and run the vent vertical to above the flood-level of the vanity and tie into the existing 2" vent on the right.

    Would running the centered drain from the two sinks back to the right to the existing drain be alright? I'd like to avoid cutting into the 3" drain in the basement. Since this 3" drain is pretty unmovable, getting a fitting inserted sounds somewhat difficult.

    The current 1/2" supply lines are fed from two 3/4" lines running left to right in the picture. They continue on to the right for about a foot past what you see where they tee to the shower and tub toward the bottom of the picture and to the right for the toilet and a currently unused laundry hookup. The cold is 3/4" in all directions but the hot is 3/4" to the tee then 1/2" off of that.

    Thanks again,
    -John-

  10. #10
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,195
    Blog Entries
    1

    Default

    wallskev, At 12:30 in the morning I'm not going to give a full reason. Especially when he has seen the right way to have done this.
    Which, by the way he could still do.
    The fixture cross would have been closer to the right.
    You can go 42" with each trap arm.

    I have a second option below that would pass inspection with the 2" waste line coming up from the floor. As long as that wasn't a vent for downstairs.
    The tee for the first lav would be above the first tee, and then a tee at 42" to revent the second lav.
    Attached Images Attached Images  

  11. #11
    DIY Junior Member john-ee's Avatar
    Join Date
    Jan 2010
    Location
    IL
    Posts
    3

    Default

    Thanks Terry. I'm going to redo it with the fixture fitting and run the drain over to the 2" line to the right, unless that creates a problem as well. The tee on that line was already there for the original vanity drain and this serves as the water closet vent as well. Nothing else below.

    Thanks,
    -John-

  12. #12
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
    Join Date
    Jun 2009
    Location
    Penticton, BC
    Posts
    810

    Default

    You shoulda just circuit vented the two sinks. Woulda been quick and easy.

    Yes I would make the main line a min of 2" however up here that line would just have to be sized as a wet vent and it would techinically be ok on 1.5".
    Plumbing in Canada



  13. #13
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,195
    Blog Entries
    1

    Default


    Here's another take on converting a single lav to a double lav

  14. #14
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,624

    Default ???????????

    Without a ruler in the picture, it is just a guess, but given the distance of the horizontal vent above the openings for the sink drains, I am guessing that it is neither 42" above the floor, NOR 6" above the sink rims.

  15. #15
    DIY Junior Member xr4ti's Avatar
    Join Date
    Dec 2008
    Location
    Wisconsin
    Posts
    26

    Default

    Quote Originally Posted by hj View Post
    Without a ruler in the picture, it is just a guess, but given the distance of the horizontal vent above the openings for the sink drains, I am guessing that it is neither 42" above the floor, NOR 6" above the sink rims.
    Double vanity at a child daycare?

Similar Threads

  1. Single to Double Sink Vanity (again)
    By SAS in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 30
    Last Post: 07-11-2011, 02:31 PM
  2. another Single Vanity to Double Vanity thread, IPC
    By tekmassa in forum IPC Plumbing Code Questions
    Replies: 12
    Last Post: 06-05-2010, 01:30 PM
  3. Yet another single to double vanity post
    By xr4ti in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 11
    Last Post: 04-12-2009, 07:48 AM
  4. Converting single vanity into double
    By rhosch in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 12-31-2008, 05:38 PM
  5. Double vanity from single
    By nc8861 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 07-31-2008, 07:21 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •