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Thread: Insulate undersized supply pipes to quiet them?

  1. #1
    DIY Junior Member Buttonsrtoys's Avatar
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    Default Insulate undersized supply pipes to quiet them?

    I'm remodeling and ripped out all my 1" plaster and am replacing with 1/2" gypsum board. Because of this, I'm realizing how loud my supply pipes are. In particular, when a toilet or tub fills. It's a 60 y.o. house and the pipe's are 1/2" throughout, so undersized. The the pressure and supply are both fine, it's just the noise that's the problem. I don't have it in me to rip them out and am wondering if wrapping them with insulation would help. If so, is there a particular size or type? Any other advise would be much appreciated.

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    Moderator & Master Plumber hj's Avatar
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    Default noise

    The noise will be transmitted through the entire system, so insulation will probably not have a significant effect on quieting them.
    Licensed residential and commercial plumber

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    Sprinkler Guy Wet_Boots's Avatar
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    You might get better results by way of installing a pressure reducing valve, since lower pressure equals lower flows and quieter plumbing.

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    DIY Junior Member Buttonsrtoys's Avatar
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    Quote Originally Posted by hj View Post
    The noise will be transmitted through the entire system, so insulation will probably not have a significant effect on quieting them.
    Thanks HJ. Due to my ongoing reno, I have access to 90% of the system (it's mostly in my exposed basement ceiling and one open wet wall). Do you think I'd still see negligible results?

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    DIY Junior Member Buttonsrtoys's Avatar
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    Quote Originally Posted by Wet_Boots View Post
    You might get better results by way of installing a pressure reducing valve, since lower pressure equals lower flows and quieter plumbing.
    I'd like that idea. Thanks!

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    In the Trades Gary Swart's Avatar
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    Default

    Note that a PRV usually needs a thermal expansion tank installed also. Neither of these are extremely expensive nor are they difficult to install.

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    Moderator & Master Plumber hj's Avatar
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    Default Prv

    Lower pressure equals lower flows, which is the same as lower volume, so your shower output may be adversely affected. The real problem is that your entire system is undersized, and you are trying to fix it by "putting band aids on a broken leg".
    Licensed residential and commercial plumber

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