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Old 09-25-2009, 11:57 AM   #1
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Question about Pex Plumbing...

We just had Pex plumbing installed about two weeks ago. We noticed that when we used the hot water in one bathroom, there was a banging in the wall. Our contractor (not the plumber) said that would be the pex pipe hitting the wall due to the pressure. Now it is doing it every couple of minutes or so without any water being on.

Why would it do this and are there any fixes?

Thanks in advance for any advice.



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Old 09-25-2009, 01:17 PM   #2
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IMO-you got a BS answer! I am not a licensed plumber by profession. I own a "HandyMan" business and have worked with all the trades involved in home building. I'm retired after 38 years in Industrial Maintenance. Does this make me the "expert"? NO, I admit this. But, I do use a lot of PEX in home repairs, I worked for a local plumbing co. for minimum wages to learn about PEX. I have never seen PEX used in plumbing a new/older home that would create this type of banging "because of pressure". The only way I can think of it doing this, would be if someone created a loop of PEX within the wall (not easy) and this would move with water being turned ON/OFF. MY guess: YOU stated that "when we used the hot water in one bathroom", but not whether the sink or tub. Let's say sink. IF the installer/plumber did not secure the PEX line as it is elbowed to the stop valves of the sink: THEN you could have the PEX line jumping back when you turn the water OFF. Look under the bath sink, locate the stop-cock's, turn the HOT water ON wide-open quickly and then turn it off quickly, and see if the HOT water stop-cock moves in/out. Do the COLD water side this way also to check it. This could also happen in the bath when water is used anywhere else in the home. IF this moves, call whomever did the new PEX plumbing--it's their problem. IF it doesn't--we'll step back and punt. Keep us posted, Thanks, David


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Old 09-25-2009, 10:47 PM   #3
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Agreed, this is an installation issue. There might be some air in a line somehow causing the banging but that's unlikely. It can't be water hammer if it continues after the valve is opened and left open. Water hammer happens from the surge of water on a fast-acting valve when it opens (washer machines normally), causing the line to want to jump around.

Somebody did a bad install on your plumbing.
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