(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 6 of 6

Thread: Sluggish drain on new sink rough-in

  1. #1
    DIY Junior Member Scott_'s Avatar
    Join Date
    Feb 2014
    Location
    illinois
    Posts
    2

    Default Sluggish drain on new sink rough-in

    I have just completed a rough-in for a double vanity. I hooked up a single vanity to one side to test it and it drains, but it's a little sluggish. If I let the water run for a couple of minutes the sink fills up and it'll take a minute or two to empty. The drain and vent pipes are both 1 1/2". Here's a picture of the set up (the other side of the set up has a plug in it)Name:  DSCN0126.jpg
Views: 84
Size:  47.5 KB. Can anyone help me figure out what's wrong and why it drains slow?





    Thanks,

    Scott

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,655

    Default

    I cannot tell why it drains slow from your photo. In fact it should drain extra fast because you have created two "S" traps which always drain faster because they do not have vents. More likely you have "vessel sinks" without overflows and they almost ALWAYS drain the way you describe.
    Licensed residential and commercial plumber

  3. #3
    DIY Senior Member Hammerlane's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    252

    Default

    Quote Originally Posted by Scott_ View Post
    Can anyone help me figure out what's wrong and why it drains slow
    I would guess because you used the wrong fittings. A and B should be Sanitary-tees not Combos.
    Attached Images Attached Images   
    Last edited by Hammerlane; 02-03-2014 at 10:15 AM.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default

    Switch out A and B with santee's to prevent siphoning.
    And if you have a vessel sink without the overflow, you will need a special drain for it. Grid drains don't work and typical pop-ups don't work on those.
    HJ mentioned that above too.

  5. #5
    DIY Senior Member Hammerlane's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    252

    Default

    Here a photo that Terry had posted.
    Attached Images Attached Images  

  6. #6
    DIY Junior Member Scott_'s Avatar
    Join Date
    Feb 2014
    Location
    illinois
    Posts
    2

    Default

    HJ, Hammerlane, Terry... Thank you for your quick response and excellent guidance. I used Terry's diagram (with santee's) when I did the original rough-in but I had someone who I thought knew plumbing review it before cementing everything together and he told me that the santee's should be replaced with the combos so I changed them out. Hammerlane, your diagram was really helpful explaining why the combos won't work. I also wanted to mention that the vanity I was using to test the setup has a vessel sink. The double vanity that will be used for the final install doesn't have vessel sinks, so not worried about needing a special drain, but just wanted to say I was impressed you guys knew the sink that was in place on the vanity for the test was a vessel. You guys are the best... Thank you again.

Similar Threads

  1. rough-in sink drain through floor - where/what to cap for inspection ?
    By plumbx in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 8
    Last Post: 12-29-2012, 07:11 AM
  2. Drain location for kitchen sink rough-in
    By JMingrone in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 27
    Last Post: 12-03-2012, 10:03 AM
  3. rough drain set up for kitchen sink.....look ok?
    By bbillcee in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 10
    Last Post: 12-13-2008, 07:16 AM
  4. Sluggish toilet
    By John in herndon in forum Toilet Forum discussions
    Replies: 1
    Last Post: 05-27-2007, 02:50 PM
  5. Rough-in hight of sink drain?
    By tjbaudio in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 0
    Last Post: 01-03-2006, 01:33 PM

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
  •