Faint dripping sound UNDERNEATH toilet in piping underneath floor

Discussion in 'Toilet Forum discussions' started by jplacroix, Mar 18, 2013.

  1. jplacroix

    jplacroix New Member

    Messages:
    2
    Location:
    Toronto, ON
    Hello everyone, we live in a 4 years old house and the toilet from the second makes a very faint dripping noise, under the toilet, possibly coming from the floor. There are no leakage from the tank or the toilet. We can clearly hear a dripping sound that coincides with the volume that is put into the toilet bowl. More volume is added, the quicker the dripping noise goes and then slows down a few moments after the entire flushing cycle is over. The noise is NOT a noise of water flowing down the drain as fluid is added to the water contained in the toilet. The sound is a DRIPPING noise, coming from a pipe within the floor, underneath the toilet. I am no plumber but this is the best way to explain it.

    This toilet is on the second floor, and I don't notice any odor or wet spots on the ceiling from the first floor, but I wonder if there might be a leak causing the dripping noise? Is it possible the water is dripping internally to the pipe and causing the noise, or should I be concerned for a much bigger problem and water dripping inside the wall or in the floor? I find it hard to believe a drip could exist within a pipe since fluids prefer to travel along the surfaces of objects.

    Please & thank you!
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,266
    Location:
    New England
    the toilet bowl is sort of like a full tea kettle...add anything, and some drips out the spout. Depending on how much, and how fast it is added, it could easily be in drips. Because on refill, most toilets overfill the bowl, and it can take it a few moments after the fill cycle stops for the bowl level to stabilize at the weir (rim - outlet). On an older house, the pipes might have been cast iron, and those isolate the sounds much better than their modern plastic equivalent of pvc or abs.
  3. jplacroix

    jplacroix New Member

    Messages:
    2
    Location:
    Toronto, ON
    Thank you jadnashua.
    This is a brand new house, for sure we are dealing with PVC.
    I am familiar (read basic!) with the functionning of the toilet and I do understand how the toilet maintains its level of water in the bowl as volume is added (your kettle example) but I never came across a dripping sound like this hence why I was concerned with it. For sure the dripping sound happens only when there is added volume so it HAS to be caused by the water escaping the bowl through the drain (your explanation makes total sense). My concern was that water escaping should not create dripping sound!

    So you suggest that there are no water leaks in the floor and no need to worry about the dripping sound? Since there is no evidence of water damage or odor between the toilet drain (or seal) the dripping sound may be coming from the INSIDE of the pipe and does not automatically flag a leak. Perhaps it is the angle of the pipe when it was installed that is more favorable to a dripping pattern?

    Thank you kindly for your post
  4. kreemoweet

    kreemoweet Member

    Messages:
    374
    Location:
    Seattle. WA
    Where the water exits the toilet, at the "horn", there is no pipe surface to follow, and the water must necessarily "drip". Dripping noises
    from drain piping are downright common.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,266
    Location:
    New England
    Some toilets and piping orientations are noisier than others.
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