10:14AM | 10/13/07
Member Since: 10/12/07
2 lifetime posts
My house is 25 years old and recently developed a knocking sound in the wall shared by the shower and bedroom. A plumber removed the shower head and could not find the cause. He then removed a section of the bedroom wall to expose the pipes. Still, no evidence of the cause. There is no leaking, the sound is completely random. There is no link to any water activity inside or outside the house. He also checked the crawl space below the house. I'm afraid to have the wall sealed until I know what the problem is. Thanks for your thoughts...



11:00AM | 10/13/07
Member Since: 04/25/05
1915 lifetime posts
In another forum someone had a problem with random noise in their pipes.

After looking at many different places it ended up being a Pressure reduction valve on the water main out in the street. That is not common situation, but keep all possibilites open.

How offten and what part of the day does this noise occure?

What all equipment do you have where water will run automatically from time to time.

This includes things like water softeners and some water filters that have regeration or backwasher cycles and ice makers.

It also include toilets with slow leaking flappers.


09:19PM | 10/15/07
Member Since: 10/12/07
2 lifetime posts
Thanks for the response.

I've noticed the noise as early as 7am and as late at 11 pm - usually 3 or 4 times per day and last from a few seconds to a couple of minutes.

I don't have anything that would allow water to run automatically (no filters, ice maker, etc).

When the plumber came out, he checked the toilets and replaced one of the flappers.

How do I check the pressure reduction valve at the street?




05:45AM | 10/16/07
Member Since: 04/25/05
1915 lifetime posts
A PRV out in the street on the main would be the utility companies.

However, that is a very, very, very usual condition to have one in manhole in a residential area.
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