Banging noise from toilet after flushing

Discussion in 'Toilet Forum discussions' started by thatgirl2478, Mar 8, 2007.

  1. thatgirl2478

    thatgirl2478 New Member

    Jul 1, 2006
    We're in the process of adding a second bath to the basement. We had the concrete broken and the soil pipe tapped into to run a new line to where the new bath will be. This was all done by a pro.

    Shortly after this job was finished (note that we have all the connections 'capped' off in the basement until we can finish the rest of the bathroom - so no fixtures yet) we noticed that after flushing the toilet on the second floor (existing) we would hear a bang or thud coming from we think the floor area (or somewhere below us).

    Any one have any idea what it could be?
  2. markts30

    markts30 Commercial Plumber

    Sep 25, 2006
    Commercial Plumber
    Phoenix, AZ
    Have someone flush while standing by the stack in the basement..
    See if you can locate the exact source of the sound...
    Might be so simple as to be a loose pipe....
    Last edited: Mar 9, 2007
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  4. BeauSoleil

    BeauSoleil New Member

    Mar 7, 2007
    Sounds like a water hammer to me

    When the new plumbing was stubbed (connected) into the existing house water supply, being that the new work was in the lowest part of the house, it necessitated draining at least part of the system. My guess is that prior to the work, some location in the system had a column of trapped air which absorbed the shocks associated with water flow (as in a toilet filling) when it was suddenly shut off, as happens when the toilet tank reaches full, especially with Fluidmaster sudden off type Fill valves.

    If my guess is correct, having a water hammer preventer added to the system should cure the problem.

    Not an Expert.
    Last edited: Mar 9, 2007
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