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What causes banging when flowing hot water gets up to temp, then stops while flow rate drops to 30% normal, OR I turn on the cold tap too?

I live in a single story house, and about 4 months ago started getting a banging in the pipes. It ONLY happens when the hot water tap is open in the bathroom and gets up to temperature, and immediately stops when the cold tap is also opened. Furthermore, if I let it continue with only the hot tap open, the water coming out drops to about 30% the normal amount, and stays there, with NO more banging. Turning the tap off and on again restarts the banging, but the resulting reduced flow and stopping of the banging happens more quickly. We made absolutely no changes in the house plumbing system before (or since) this started. I have been unable to determine exactly where the banging is happening, since leaving the tap open and then crawling under the house is long enough to have it stop banging and just having reduced flow.

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It's called water hammering. you need to install whats called a "water hammer arrester" to stop the banging. It happen over time as the straps holding down your pipes loosen. It can cause joints to crack and should not be taken lightly I've seen many homes damaged by people not taking action to solve the problem.

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Sykosis answear to your problem is correct, I was going to give you that same advice! He is also right on about the damage it can cause, I'm a gc (general contractor) in n.e.pa, and do a lot of home remodeling/ repairs due to that problem. Take his advice he is right! Good luck!

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I'm in the pipefitter apprentice program and have studied this. Yes,they're correct. It's water hammer and you need a water hammer arrester.

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Open up the angle stop its half way open .. Its located under your sinks its very common = )

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Thank-you. That was the solution. So simple, so brief, so life changing. :)
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Your welcome sir = )
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You can also try shutting the water off at the meter , then draining the water lines , this allows air into the system giving you cushion against the water hammer

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