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asrprof
Water hammering sound in shower
asrprof

One of our tenants in a single-family home complained of a hammering sound when she turns on the shower. (She sent us a video which I tried to attach, but the file was not accepted. We have not directly observed the problem ourselves.) When she first turns the shower on, the hammering sound is continuous and rapid, and the water pulses in rhythm with the sound. When she adjusts the valve, it goes away, and when she returns the valve to the same position it had when the hammering started, the hammering sound does not return.

Also, the shower has a single valve.

This sound has been there for at least 15 months, since they moved in, but they just now let us know.

Any ideas about how to fix it? Just lower the water pressure, or is something else probably the cause?

dj1
Re: Water hammering sound in shower
dj1

The best way to diagnose it is actually by being there when it happens, but here is something you can try, if you are handy: install a hammer arrestor on the hot pipe coming out of your water heater, and see if there's a change. They are fairly inexpensive and easy to install.

Fencepost
Re: Water hammering sound in shower
Fencepost

It could be a faulty valve, and not necessarily the shower valve. Make sure that any valves in the supply line are fully open. If the stem of a supply valve seems loose, the valve may need repair. Valves should operate with some resistance, and should not have any wiggle between the stem and body. (It's OK for the handle to be loose, as long as the stem that the handle is attached to isn't loose.)

A partially open or faulty valve can exhibit oscillation at certain flow rates.

dj1
Re: Water hammering sound in shower
dj1

Could also be insufficient pipe strapping inside the walls.

asrprof
Re: Water hammering sound in shower
asrprof

Just to update: I reduced the house water pressure by about 10 psi and the tenants report no more hammering sound. Thanks to all who posted a reply to my question.

dj1
Re: Water hammering sound in shower
dj1
asrprof wrote:

Just to update: I reduced the house water pressure by about 10 psi and the tenants report no more hammering sound. Thanks to all who posted a reply to my question.

What is the interior water pressure at the moment? measure in at least two locations.

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