(206) 949-5683, Top Rated Plumber, Seattle
Page 3 of 3 FirstFirst 123
Results 31 to 38 of 38

Thread: Converting single bathroom sink to double sinks

  1. #31
    DIY Junior Member My Dream's Avatar
    Join Date
    May 2011
    Location
    Ontario Canada
    Posts
    5

    Default

    Picture #12

    This is the frontal view. ABS drain would maintain standard 1/4" per foot slope.

    Name:  my_dream_12.jpg
Views: 885
Size:  65.0 KB
    Last edited by Terry; 05-04-2011 at 10:02 AM.

  2. #32
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,215
    Blog Entries
    1

    Default

    Right now you have an 1-1/2" drain line for one lav.
    I can't make out on the drawing which way you are intending to drain it.

    Normally you would use a fixture cross and drain out the bottom with 2"

    Last edited by Terry; 05-04-2011 at 10:16 AM.

  3. #33
    DIY Junior Member My Dream's Avatar
    Join Date
    May 2011
    Location
    Ontario Canada
    Posts
    5

    Default

    Thanks for the reply Terry, it's appreciated.

    Yes the builders use 1 1/2" abs for the drain assembly. At present there is new ceramic flooring therefore it would be too costly to rip it up and redo the drain through the floor. The present drain runs horizontal and I'll assume it's already vented to the stack shown in the attic. My plan was to add another vent between the two drain assemblies and run it vertical between the wall and tie back into the main attic vent which is approximately 27" away.
    Last edited by My Dream; 05-04-2011 at 11:24 AM.

  4. #34
    DIY Junior Member jaydub2010's Avatar
    Join Date
    Oct 2010
    Location
    Whidbey Island, WA
    Posts
    11

    Default

    quick question on this subject.. doing some reno work on my parents main bathroom on the second floor of their 80's split level. Their main bathroom has a 72" vanity and is plumbed for one sink. They wanted to put a double sink in so I was going to open up the wall behind the vanity and see what is going on. There is an adjoining bathroom on the back side of this wall which also has a single sink and vanity. I will verify once its opened up but was curious if they would have connected these two sinks and their respective drains/vents? And if so, is it a fair assumption that they would have a 2" drain pipe leading down? If I open things up and find that they're separate systems, I will need to provide a 2" drain pipe down for the new double sink, correct? exactly how far down? All the way to the stack?
    Last edited by jaydub2010; 05-21-2011 at 05:50 PM.

  5. #35
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,215
    Blog Entries
    1

    Default

    You can't decrease the waste line. It can get bigger, but never smaller.

  6. #36
    DIY Junior Member jaydub2010's Avatar
    Join Date
    Oct 2010
    Location
    Whidbey Island, WA
    Posts
    11

    Default

    Hey Terry, which do you think is the better way, using a fixture tee (as in the new construction photo) or doing the fixtures individually (as in the "green background" photo)? In the green background photo, you mention a distance of 42" is that from the sanitary tee's up or from wye to wye?

  7. #37
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,215
    Blog Entries
    1

    Default

    If you have a 2" waste, then the double fixture cross.
    If you only have 1.5", then the green background photo. Still not really right, but at least it's all vented, and it should drain out very well. I have done it that way when there is only a 1-1/2" pipe to work with.

  8. #38
    DIY Junior Member jaydub2010's Avatar
    Join Date
    Oct 2010
    Location
    Whidbey Island, WA
    Posts
    11

    Default

    Thanks! This site is a big help! And all the discussion are great!

Similar Threads

  1. Which drain to use when converting from double to single sink
    By nazrat in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 09-08-2009, 07:41 PM
  2. Bathroom- Converting single vanity to double
    By NewJerseyJC in forum Remodel Forum & Blog
    Replies: 25
    Last Post: 09-10-2008, 07:12 PM
  3. converting single bathroom sink to double.
    By kevin 71 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 1
    Last Post: 04-23-2008, 10:55 AM
  4. Converting Double sink vanity to single sink
    By karenwondergem in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 05-31-2006, 06:17 AM
  5. single to double bathroom sink?
    By nickson5 in forum Remodel Forum & Blog
    Replies: 1
    Last Post: 12-30-2005, 06:31 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
  •