+ Reply to Thread
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1
    Join Date
    Feb 2013
    Posts
    3

    Default Water sucked out of 2nd toilet, vent stack is clear

    I have 2 toilets which tie into a 3" stack. The first (main) is located approximately 3 ft from the stack and connected with a 3 inch line and sanitary tee. The second is located approximately 15 ft from the stack and connected with a 3 inch line and sanitary tee. The second ties into the stack approximately 6" on center below the main toilet. When the main toilet is flushed, the water is sucked out of the second toilet bowl. The vent stack is 3" out the roof and is NOT cloged. In the photos, the left side is the second toilet, the right is the main toilet. Up vents out the roof, down goes ino the basement floor and to the sewer. Thoughts on how to fix this?

  2. #2
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,168

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    There is no picture.

    John

  3. #3
    Join Date
    Feb 2013
    Posts
    3

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    Sorry, I tried uploading them and it didn't work. It wouldn't let me post a link since I am a new user..Let's see...

    go to picasaweb[dot]google[dot]com/106874389684558484379/February222013#

  4. #4
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,084

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    Vaulter, I saw the photos.

    I have a question for you: how is the copper drain pipe bonded into the PVC fittings?

  5. #5
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    821

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    from what i know, which may or may not be alot, there is a vent clog somewhere. maybe you just can't find it. i can't think of any other reason why something like that might happen. i'd recommend having a plumber snake the vent from the roof to the basement or have a plumber with a scope run a camera down the length of the vent. i'll bet you that there's something blocking the vent somewhere, maybe an elbow or somewhere else.

  6. #6
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,558

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    Your problem is caused by not having a vent on the lower connection. When the toilet on the upper connection flushes it blocks the venting of the lower line.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  7. #7
    Join Date
    Feb 2013
    Posts
    3

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    I have also installed an AAV on the sink, which i ties into the same drain as the toilet (i think it is a 1.5"x3" wye). Did not do anything to help the problem...

    Could it be something related to how close the 2 sanitary tees are to each other when they tie into the main stack? They are only abut 6" on center, which is 3" between the bottom of the main toilet drain, and the top of the other drain. Could this somehow be creating a siphon in the second line that even the AAV cannot handle?
    Last edited by vaulter825; 02-24-2013 at 05:25 PM.

  8. #8
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,558

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    Yes as the flush from above rushes by the lower line it creates a suction.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  9. #9
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    821

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    either the vent is blocked or something is not properly vented.....end of story

  10. #10
    Join Date
    Feb 2013
    Location
    The thumb, MI
    Posts
    54

    Default Re: Water sucked out of 2nd toilet, vent stack is clear

    already covered....ignore.

Posting Permissions

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