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Noisy shower

The shower in the second floor  master bathroom makes a scraping noise that radiates to the bedroom below and disturbs the occupants.  I have tested some theories.  If I remove the shower head and run the shower,  the noise stays the same.  So the problem is not the shower head.  It is not a water hammer.  The installation is NEW, so it is not corrosion or build-up on the parts.  I installed a new cartridge and this had no effect.

The unit is a single mixer with a diverter to shower or hand wand.  The noise occurs no matter where the temperature mixer is set.  The only thing that reduces the noise is installing a flow restrictor in the shower head.   But the flow is then too slow, hardly a normal flow rate.   This solution is not acceptable.  The noise seems to be related to the volume of flow.  I don't know how the pipes are connected, they are inside the wall.  Could there be too many bends in the pipes, or a narrowing of the pipes at some point?  I SHOULD(!) be able to get a full flow withoit the scraping noise!  Someone suggested it might be similar to the noise from a hose bib, but how do you fix that?

Re: Noisy shower

Have you tried connecting the showerhead directly to the pipe without the diverter and wand? This will eliminate diverter being the problem.

Re: Noisy shower

Do you get the noise with the hand wand? It could be the lack of pipe straps.

Re: Noisy shower

No the noise is only with shower head.  But I believe the hand wand takes less volume.

Re: Noisy shower

No I can't access the piping ahead of the diverter.  It's inside the wall.   Someone suggested the only solution is to open the wall all along the pipe and insulate it. Is this recommended plumbing procedure?  Should the installer have done this as a noise preventing measure?  Is this a "secret" plumbers trick, kind of like using iron drain pipes from second story because plastic drains are noisy and bother occupants below at every toilet flush?


Re: Noisy shower

It sounds a little like the plumber used plastic supply lines and one of them has a small kink in the line. Like a water hose would if you the radius send is too small. Pex I think is the name of some of the plastic supply lines. I always use and recommend copper. Most people do not want the initial expense. But they always come back to it after the initial install.

That is not a secret about the noise reduction when using cast iron pipe for drain. Pretty much everyone knows about that. It is your house, you are the only person to specify what it to be used/installed. If this was already in place when you purchased this house, you have the right to change it all to something of higher quality.


Handy Andy In Mt Airy NC

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