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Thread: Occasional cold water pipe noise when flushing

  1. #1
    DIY Junior Member
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    Default Occasional cold water pipe noise when flushing

    I am getting occasional noise whenever the toilet finishes filling the bowl and tank. There's no pattern that I can figure out yet. I don't always get the noise when the tank finishes filling. I don't get the same noise when I turn off the cold water at the sink or in the shower.

    Any thoughts on how to remedy this? Maybe shut off all the water, drain what is in the pipes, turn on the water in the house, and reopen the main? Maybe add a threaded water hammer arrestor to the toilet?

    Thanks!
    Eddie

  2. #2
    Plumbing Designer FloridaOrange's Avatar
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    Is your toilet shut off valve all the way open?

    Could the noise be just coming from the toilet (flush valve) as opposed to the water distribution?
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

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    Retired Defense Industry Engineer jadnashua's Avatar
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    What kind of noise? ARe the pipes banging, a rattle, rushing sounds? WHat?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
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    Yes, the valve is open all the way. I think the noise is water distribution related. When the tank is full, you hear a clunking sound when the fill stops.

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    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by traffic626 View Post
    Yes, the valve is open all the way. I think the noise is water distribution related. When the tank is full, you hear a clunking sound when the fill stops.
    [edit]

    Thinking about it you said the noise goes away when you aren't running water in the tub / lav right? To me this would mean one thing probably.

    You have 1/2" lines feeding everything in your bathroom and when you have more then one thing running at a time the velocity in your piping increases causing water hammer when your toilet fill valve closes.

    If this is true you could prove it trying to cause the other fixtures to water hammer as well. IE run your tub and lav. Then quickly close one of the fixtures (as quickly as you can kinda thing). If you get the same-ish sound and the sound goes away at the fixture when it's the only fixture running then you know it's the piping.

    If you can't seem to recreate the sound elsewhere in system then it's likely that your fill valve in the toilet is acting up.
    Last edited by Doherty Plumbing; 11-20-2009 at 08:58 PM.

  6. #6
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    Actually, the sound goes away if I have the faucet or the tub's cold water running at the same time. I tried shutting the water quickly for the sink and tub and neither makes a sound. Think the toilet's fill valve is worth swapping out?

  7. #7
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by traffic626 View Post
    Actually, the sound goes away if I have the faucet or the tub's cold water running at the same time. I tried shutting the water quickly for the sink and tub and neither makes a sound. Think the toilet's fill valve is worth swapping out?
    Oh sorry I had it backwards.

    Yes try changing the fill valve.

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