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Old 03-26-2008, 05:00 PM   #1
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Pipes Banging


I live in a small garden home that is about 7 years old. If I flush a toilet OR run a sink, everything sounds fine. However, when I flush a toilet AND run a sink, the pipes make a loud banging sound. If I turn off the faucet, silence! Basically, whenever there are 2 different water sources running at the same time, the banging appears. It does not happen every time, but I would say about 80% of the time. Any opinions would be appreciated...
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Old 03-26-2008, 05:06 PM   #2
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Pipes Banging


Could be loose pipes in the wall that need to be straped in. It may be ok, but if they are banging around I would be concerned about them hitting and wearing a hole in the pipe.
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Old 03-27-2008, 08:52 PM   #3
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Pipes Banging


Definately a pipe(S) in the wall that were not properly secured. It just takes the volume of the two fixtures to get enough water flow for the harmonics to kick in. It is also very difficult to isolate exactly were the problem is since the pipe is an excellent sound conduit. You may have some luck with an inexpensive doctor's stethascope, but don't be surprised if you end up a stud or more off of the problem. I have had luck before with just using the stop valves to restrict the flow to the fixtures. You will be amazed at how much you can shut the valves down before really being able to see any problems in their performance,

Last edited by troubleseeker; 03-27-2008 at 08:55 PM.
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Old 03-28-2008, 12:33 PM   #4
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Pipes Banging


Yes its called water hammer. The proof positive way of quieting it is to put a cushion area for it at the right spot,,,which could be trial and error. See if you can find a small charge tank that you could fit up under the sink cabinet, with a bladder and air valve stem like a tire. That would be the least inconspicious place for having it fixed!! OR put a parallel pipe with a cap on it besides the vertical incoming line, the top stays full of air(hard to explain)
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Old 03-28-2008, 07:50 PM   #5
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Pipes Banging


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Originally Posted by justdon View Post
Yes its called water hammer. The proof positive way of quieting it is to put a cushion area for it at the right spot,,,which could be trial and error. See if you can find a small charge tank that you could fit up under the sink cabinet, with a bladder and air valve stem like a tire. That would be the least inconspicious place for having it fixed!! OR put a parallel pipe with a cap on it besides the vertical incoming line, the top stays full of air(hard to explain)
Water hammer is actually a different scenario than described. It is the result of water freely moving through a pipe and then suddenly being stopped by a valve being quickly closed. As we remember from basic science, the water still has forward momentum, so it slams into the closed valve or the end of the pipe run thus sounding like the pipe has been hit with a hammer. This problem is usually caused by appliances that have quick closing valves, such as dishwashers and washing machines. It is usually solved by installing a tank as described , an air chamber in the supply line (just a vertical extension of the supply pipe, located so that it will trap a cushion of air to absorb the water's momentum , or a commercially available arrester chamber. There are even screw on units that can be installed at the valve/machine hose connection to solve this in washing machine locations.
This problem is caused more by the flow of water creating vibrations in the pipe which is then transferred to the studs at the spot where the pipe is not secured, basically creating a musical instrument in the wall, although not exactly an ear pleasing tune.

Last edited by troubleseeker; 03-28-2008 at 07:53 PM.
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Old 03-29-2008, 08:24 PM   #6
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Pipes Banging


Does this happen regardless of the toilet that is being run? I have seen balcocks cause the same thing. If its only the one toilet flushing with that faucet causing it I would try changing it and see if that helps. Its a cheap fix sometimes.









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