I've got a problem with water hammer coming through a shared water main from my neighbour's house when their washing machine fills. This results in a loud thudding sound in the wall between my bedroom and bathroom (I'm guessing there's loose pipework from my shower). After a few years of negotiations with their landlord I finally managed to get them to fit a water hammer arrestor. However, it only seems to have stopped the thud that happens when the valve closes. Is there anything that can be done to stop the thud from the valve opening? I realise that securing the pipe work would be the best option but this would involve knocking holes in walls and I don't have the funds to tidy that up!


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    You may be able to add another arrestor on your toilet or sink that can further reduce the water hammer in the wall for less than 20$. – Ed Beal Nov 20 '16 at 16:37
  • It's probably an improperly secured pipe banging in the wall. Unfortunately opening the wall and securing the pipe may be the only real option here. – Sean Nov 21 '16 at 22:17
  • Thanks for the advice guys. As I've said, sorting out the pipework isn't an option right now. Any ideas as to why the water hammer arrestor has only worked to stop the noise when the neighbour's washing machine valve closes? – Ange K Nov 22 '16 at 23:04

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