Knocking Pipes (plumbers couldn't figure it out)

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Kim Y, Jul 21, 2014.

  1. Kim Y

    Kim Y New Member

    Messages:
    2
    I have a Danze shower faucet, installed in 2011, and the knocking is driving us INSANE.

    Started with a small ticking/knocking when we kept the water running to get it warm/hot. As the water heated up, we'd hear a faint ticking/knocking noise. Not a big issue.

    Now it's gotten to be a big knocking noise that will happen at any time, even when no water is running, to a hammering noise when the faucets (any faucet in the home) is turned on or off - hot or cold.

    We plumbers over - they installed water arrestors under the bathroom sink, restrapped all the pipes under the house, cut a hole in the drywall behind the shower - they couldn't figure it out.

    Most of the sound seems to be echoing from the shower faucet.

    Thoughts? Things we could try?

    :(:(:(:(:(:(:(:(
  2. Reach4

    Reach4 Well-Known Member

    Messages:
    2,671
    Location:
    IL
    Could the sound be originating from the water heater?
  3. dw85745

    dw85745 Member

    Messages:
    71
    Location:
    Arizona
    I'd try three things:
    1) If there was no problem prior to the Shower faucet replacement, I'd call the faucet manufacturer, describe the problem and see what feedback you get. Possibly the value is loose or defective.
    2) I just did a H20 heater and they are a lot noiser but mostly whistling noises.
    3) There may be air trapped in the line.
    crosstalk likes this.
  4. fullysprinklered

    fullysprinklered Member

    Messages:
    260
    Location:
    Georgia
    I had a customer with a knocking pipe issue. I misdiagnosed it as an improperly secured water pipe, but I was wrong. As it turned out, it was the PRV.(sheetrocked over inside a wall in the laundry room). You turn the water on and in a little while this tapping noise would start up. I replaced the prv and that solved the problem.

    While we're on the subject, someone posted an inquiry concerning pipe noises a while back. One thing that didn't get mentioned was the fact that these vaccum-breaker hose bibb contraptions required in some areas, can make that lovesick whale noise when they start going bad; so check that.
  5. WorthFlorida

    WorthFlorida USCG escorting cruise ship leaving Port Everglades

    Messages:
    126
    Location:
    Lake Worth, Florida
    This maybe your problem but this tread was for a Moen PosiTemp with a Danco replacement cartridge. Danze might have something similiar.
    http://terrylove.com/forums/index.php?threads/water-hammer-knock-danco.32514/

    Just two weeks ago I replaced another Moen 1222 cartridge. About the forth one in four years on my own home, my son's and friend's homes. All homes were built around the same time (2007). The cartridge is made of three pieces (outer is pastic, the other two are stainless steel) and to balance the water flow should the cold or hot side have a sudden drop in pressure. The inter most sleeve moves back or forth to balance the pressure to the shower head. When you turn off a faucet anywhere in the home (the shower faucet off) the pressure changes and this part in a Danco version moves and taps the metal body of the cartridge, hence the metal body to the copper pipes. I had to change these Moens out because the inter sleeve gets itself jammed whereby it blocks some of the hot water flow or totally cuts it off. I bought a new Moen replacement and this inter sleeve looks like it is made of ceramic instead of stainless steel. I didn't have time to wait for a free replacement from Moen.

    Might be worth changing the Danze cartridge out to keep your sanity. I found this DANZE part on http://www.plumbingsupply.com/danze-replacement-faucet-parts.html Not the same but the part circled is similar to Moen.

    Attached Files:

    Last edited: Jul 25, 2014
  6. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,268
    Location:
    Maine
    Sounds like someone drilled a hole that is either too small or misaligned so the pipe is rubbing on the stud.
  7. OffshorePlumber

    OffshorePlumber New Member

    Messages:
    8
    Location:
    Monroe
    Does your house have a backflow preventer or a city meter with check valves?
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