DIY Doctor

Thudding water pipes

Postby GAB1979 » Fri May 01, 2009 1:37 pm

Please help... I've recently moved into a house and only just discovered that, when i turn the taps off quickly or when the washing machine lets in and shuts off water, a large thudding sound echo's through the pipes, the water pressure is'nt effected in any way its just becoming a nuisance...... please help,

Many thanks.
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Simply Build It

Postby Steve the gas » Sat May 02, 2009 4:18 am

Follow the route of the pipes if poss and make sure they are clipped regularly.
Also/ or insulate the pipes with split insulation for pipes.

Steve the gas
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Postby rosebery » Sat May 02, 2009 7:57 am

You have water hammer. It may be only a nuisance now but if its bad enough sooner or later it WILL damage your system leading to joint failure and water flowing where it should not be.


1. Reduce the flow by partially closing your main stop cock.

2. Clip the pipes where they are unclipped.

3. Change the valves causing the problem.

4. Fit a water hammer arrestor.

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