Water Hammer after new bathroom install

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Rob372, Apr 16, 2021.

  1. Rob372

    Rob372 New Member

    Apr 16, 2021
    Ontario, Canada
    Hi all. So, new bathroom installed with a tub converted to standup shower with rainfall and hand held shower system (no tub spout). Long story as short as possible, we developed a water hammer issue. Happens when turning off almost any fixture in the house. When the shower is turned on there is no sound from anywhere else. Original plumber had installed air intake arrestors in the shower and that is where sound is coming from. Checked all pipes, nothing is moving and everything is properly strapped. Water arrestors were installed on toilet and sinks also (4), didn't have any effect.

    Just had the copper plumbing going up into shower reconfigured with the arrestors removed and took about 3 feet of copper piping off and replaced with some PEX. The problem is now much much less but still there (maybe a 70-80% reduction). So we have had the original plumber investigate, my own and most recently another one from the contractor . We also tried changing the shower cartridge, didn't work but most recent plumber said that isn't the problem.

    Now, what he is saying is to replace the copper plumbing (accessed from the ceiling on level underneath) going from the sinks up into the shower with PEX and that should fix the remaining problem.

    Does this seem right? Any other ideas?
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    What is the water pressure to the home? Over 80 PSI should have a pressure reducer.
    Sometimes on older homes, a passive toilet fill valve will be bleeding water out which makes shutoffs more gradual. With everything repaired, the banging may start to happen with high pressure. Water hammer shouldn't be a copper issue.
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  4. Jeff H Young

    Jeff H Young In the Trades

    Feb 27, 2020
    many causes for water hammer none of which is caused by copper. copper may be noisier than plastic .
    If you didn't have a hammer before and you have one now its about a 99.99 percent chance something you did either created the water hammer or contributes to it. pipes not strapped removing flow restrictors, bad or lack of a PRV with high water pressure
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