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Old 08-17-2011, 02:06 PM   #1
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Loud banging from water pipes when hot water is on


My home is 12 years old and I've been there 10 years. This just started. In the bathroom when I turn on the faucet in the bathtub I'm hearing an EXTREMELY load banging noise. It often stops when I turn the faucet to a colder temp or if I turn it off. So I'm assuming it has to do with the hot water pipes. It doesn't do this when the bathroom sink is turned on...just the tub. I'm on a concrete slab so there is no crawlspace or basement underneath. It sounds like it's in the wall behind the shower. I would think that if the builders hadn't secured the pipes properly I would have experienced this before 12 years. What can I do about this? Please tell me there is a way to fix it without tearing open the wall. That is beyond my expertise and with this economy there is no money in the budget to hire someone. Help.

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Old 08-17-2011, 02:55 PM   #2
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Loud banging from water pipes when hot water is on


If you have access to the pipes try to secure them further.

Also look at the hardware store for something called a water hammer arrestor. They will reduce this racket which is due to the water suddenly stopping to flow.


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Old 08-18-2011, 09:33 AM   #3
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Loud banging from water pipes when hot water is on


As I stated in my post I don't have access to the pipes and it occurs when the water is turned on...not turned off. So, the water hammer arrestor will do no good.

Any other suggestions?
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Old 08-18-2011, 09:37 AM   #4
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Loud banging from water pipes when hot water is on


Hello and welcome mhintn, to the best darn DIY'r site on the web.

How is the flow when the valve is turned on, is it constant?

It sounds to me like you have a seal in your fixture that is interupting flow (flopping around in the valve) causing the water hammer you are hearing.

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Old 08-18-2011, 09:50 AM   #5
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Loud banging from water pipes when hot water is on


Hi and thanks for the welcome. I'm glad I found this site.

The water flow is good: constant, strong and no recent change in the flow.
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Old 08-18-2011, 09:56 AM   #6
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Loud banging from water pipes when hot water is on


Still sounds to me like you have a faulty shower mixing valve.

I would pull the valve apart and investigate possible causes.

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