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Thread: Toilet flush causes sink to gurgle

  1. #1
    DIY Junior Member brianh2000's Avatar
    Join Date
    Feb 2008
    Wash DC

    Cool Toilet flush causes sink to gurgle

    Just as the Title says, whenever an upstairs toilet is flushed, the kitchen sink gurgles. It also causes a gurgling sound in the upstairs bathtubs.


    Newly constructed luxury home.. 4 yrs old

    4 bathrooms..

    2 upper level
    1 main level
    1 lower level

    Changes to plumbing made:

    The lower level bathroom was installed 3 yrs ago,
    plumbling got dinged for improper venting at inspection.. corrected.

    Single bowl kitchen sink was replaced with a double bowl when Granite countertops were installed. not inspected.

    Seems the gurgling began after one of the two were completed, it became more noticable after the kitchen sink was installed.

    Any idea's????

    Forgot to mention, there is a flex PVC pipe installed under the sink with an additional elbow.
    Last edited by brianh2000; 02-10-2008 at 05:50 AM.

  2. #2


    While it does sound like a venting problem unfortunately, without anyone being able to look at it to see how the vents are runned, it is extremely, hard for anyone to tell you how to correct it.

  3. #3
    Plumber krow's Avatar
    Join Date
    Feb 2008
    Ontario, Canada


    Before you open up any walls

    Double check if the vent stack isn't being abstructed by some sort of nest. If it checks out, make sure your main drain is not plugged (stranger things have happened)

  4. #4
    Master Plumber Redwood's Avatar
    Join Date
    Dec 2007


    Are you in a frozen wasteland where snow could be covering the vent on the roof or, frost closure is occurring on the vent pipe?

    The newer toilets with a 3" flush valve push air and water much more forcefully than before.
    If you can extend the vent up through the roof, you should be fine. As you know now, it's not admitting air, it's giving air a place to go. You have a "positive" pressure when the new toilet is flushed.
    I see it all the time.

    The new wet venting codes were put in practice "before" the advent of the new high performance toilets.
    My guess, is that it will take years to convince some of the older plumbers that times have moved on.
    Plumbing design must take into account the new performace levels that we are seeing.
    Last edited by Terry; 02-25-2014 at 03:44 PM.

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