Loud thumping noise in wall after toilet has filled

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    • #276629
      Avatar photoJim Ferguson

        I have a 3 story 2 1/2 bath house (2 baths on 2nd floor, 1/2 bath on first). After flushing any of the toilets a loud thump occurs in the wall after the filling is completed. It also occurs infrequently at other times, but consistently after a toilet is flushed. I believe the thump is in the wall where the one vent goes, but don’t know if that’s significant.

      • #294506
        Avatar photoRetired plbg1

          Sounds like you have to much water press. if you have a PRv on maun line turn it down. If not turn your valves on the fixtures down.

        • #294507
          Avatar photonicktheplumber

            Your symptoms are classic for WATERHAMMER, which is a loud banging sound when a fixture valve closes. It’s usually associated with faucets, but don’t forget that the ballcock valve in your toilet tank is a valve just like any other.

            You could try doing what RP suggests, or you could install a water hammer arrestor on the line to the tank.


          • #294508
            Avatar photoddtennis

              We backed off the valve in all toilets and it seems to have done the job. Thanks – shows you just have to know what you’re doing.

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