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hammering noise

dalton Member Posts: 25
Whenever i flush my tiolet,sometimes i hear a hammering noise. Its unpredictable, sometimes its once a week, once a month or not for a long time. Its a regular water tank, with a tank fill valve. I snaked it before, any ideas as to what might be causing this.


  • jackchips_2
    jackchips_2 Member Posts: 1,338
    Can you explain

    the problem in more detail?

    Hammering in plumbing is usually associated with water pressure, in specific the act of the water going fast inside the pipe and suddenly coming to a stop which causes water hammer.

    It's possible your fill valve, every now and then, is "jumping" as it closes and causing a hammer in your piping in the wall. You can check by just holding the lever arm on the ball cock down with the tank full and letting it go. A solution is to replace the ballcock.

    I have not heard of a hammer in the drain, which is what you imply when you say you snaked it.
  • ScottMP
    ScottMP Member Posts: 5,884
    Do you have

    an irrigation system ?

    Do you here it from anything else than the toilet ?


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  • Dale
    Dale Member Posts: 1,317
    Water pressure

    What's your house water pressure? 40 is good, should be less than 60psi. Your tank shutoff ball could be sticking, take the lid off and watch it perhaps you'll see the problem.
  • dalton
    dalton Member Posts: 25

    Thanks for responding Jack. U got it right, hammering noise inside the pipe in the wall. It mostly happen at night, well i'm not there during the day anyway. I check the pressure awhile ago and it was 45psi. I mention "snaking" the drain because i thought there might be something stuck there. I will change the ballcock in the next couple of days and see what happen. I think when the ballcock is trying to close off it create that hammering noise.
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