(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 8 of 8

Thread: *New* Bathroom Sink pooling water and draining slowly

  1. #1
    DIY Junior Member djroygbiv's Avatar
    Join Date
    Mar 2012
    Location
    NC
    Posts
    2

    Default *New* Bathroom Sink pooling water and draining slowly

    Hi there,

    Lots of great info on this site! I've been a lurker for a while but have a small issue that recently came up and I finally registered in hopes that someone might have some thoughts on what might be going on.

    The issue is the sink in our master bathroom is draining slowly. It was a new sink and new piping put in by the previous home owner so I'm 99% sure the issue isn't a clog as it's been doing it since day 1. It's a single vessel (over-mount) sink and the "pooling" of water isn't consistant. Often times it drains ok but quite often it pools up when the water is running. It usually drains relatively quickly and that process can usually be sped up by tapping the drain or swirling clockwise the water. When you do that, it seem to "catch" and drains very quickly which made me think there might be a venting issue. I'm a novice-intermediate DIY'er with little to no plumbing knowledge so I might be way off base with that guess. Everything in the rest of the house works perfectly (including that in the other 1.5 baths) and I don't notice any correlation in the sink draining of either of those 2 are engaged.

    Any thoughts or guesses around what might be going on? Thanks in advance for any info and help!

    *EDIT* I've added a pick of the plumbing under the sink in case anybody sees anything weird there. The vent is in the wall directly behind the wall and goes straight up to our roof where the "exhaust" vent is. It's hard to tell in the pic but that white pipe on the left that goes up and end is capped with one of those black screw-in caps in case anybody is looking at that.Name:  sink.jpg
Views: 1281
Size:  44.4 KB
    Last edited by djroygbiv; 03-26-2012 at 09:06 AM. Reason: Added pic

  2. #2
    DIY Senior Member Hammerlane's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    252

    Default

    If the vent is in the wall, there is no need for the"one of those black screw-in caps" which is most likely an AAV or Air Admittance Valve.

    Why not flip that p-trap around and put the high side of the trap on the tailpiece extension. You will be able to cut the tailpiece extension a little bit to reduce some head pressure.
    Attached Images Attached Images    
    Last edited by Hammerlane; 03-26-2012 at 09:43 AM.

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,655

    Default

    It is a poor drain installation, but the problem is the drain fitting in the vessel sink. The sink does not have an overflow passage, so if the water covers the drain fitting too quickly, so the air trapped in the tailpiece cannot escape, and that long tailpipe makes the problem worse because it contains more air, the the water cannot drain until it does escape. When you swirl the water you break the surface tension and let the air out, then the sink can drain. The solution is to make the opening in the drain fitting large enough so that the air and water can move both ways at the same time.

    Slow draining Vessel sink
    The drain below is designed to drain well for a vessel sink.

    Last edited by Terry; 03-26-2012 at 11:22 AM.
    Licensed residential and commercial plumber

  4. #4
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    Among other problems, you have the trap "U" reversed, resulting in a deeper trap, which will be slow

  5. #5
    DIY Senior Member dlarrivee's Avatar
    Join Date
    Jun 2009
    Location
    Canada
    Posts
    1,172

    Default

    Is that a T on its side connected to that "Fernco"?

  6. #6
    Nuclear Engineer nukeman's Avatar
    Join Date
    Nov 2009
    Location
    VA
    Posts
    696

    Default

    Also, since the elbow that is connected to the AAV is lower than the wall connection, water is going to pool in the elbow region.

  7. #7
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default

    In how many ways does this suck?

    The p-trap is installed incorrectly
    It uses a water tee on it's side
    The AAV is at the same level as the drain
    Does it even need an AAV, or is that an attempt to speed up the draining caused by the lack of an overflow in the sink"

    A grid drain does not work with a vessel sink.
    Here is one that may work better, and they also make some with a pull-up drain cover that allows air to enter the drain.


  8. #8
    DIY Junior Member djroygbiv's Avatar
    Join Date
    Mar 2012
    Location
    NC
    Posts
    2

    Default

    Thank you all very much for the quick responses and great information. I don't know much about plumbing but I didn't think the under sink plumbing looked right. I didn't know the drain type (assuming it wasn't clog) could make that much of a difference. I've got some work to do to get this corrected. We'll bring someone in that knows what they are doing to make things right for us.

    Thanks again!

Similar Threads

  1. Tub draining slowly after remodel
    By ibisboy1 in forum Drain Cleaning
    Replies: 7
    Last Post: 07-12-2011, 05:48 AM
  2. Slow Draining Bathroom Sink
    By elshamm in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 09-01-2010, 06:22 AM
  3. Toilet, tub, and sink draining very slowly. Need help!
    By dan_public in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 09-29-2007, 07:03 PM
  4. bathroom sink draining slow
    By wendyloohoo in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 06-28-2006, 10:01 AM
  5. Tub Draining Slowly
    By BMWMK2 in forum Shower & bathtub Forum & Blog
    Replies: 7
    Last Post: 03-30-2006, 06:08 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
  •