very loud knocking / hammer noise from pipework.

[jjfresh66]

Hiya all

We get a very loud knocking or hammer noise in our house quite often.
It mainly happens when the cold water tap has been running downstairs pretty quick and then is suddenly stopped. A banging noise Boom Boom 2 seconds later bang. In the kitchen is the main water stopcock feed and It sounds like it's coming from around that area - quite hard to tell.

Anyway i can handle a bit of water hammer as i know this can be because of old pipework not secured properly. What i don't like is that this is happening late at night for no apparent reason - When everyone is in bed and the heating is off. Am i right in thinking that this could be caused by our semi detached neighbour making a brew or getting in the bath ?

Tar

 

[Timmyturtle]

So this is happening even when you have not used any taps for some while ??

 

[bengasman]

Start with clipping all the mains pipe that you can find at one metre intervals and see what happens

 

[jjfresh66]

This happens when were in bed and the water and heating haven't been used for a few hours. I'm sure it's something to do with next door.

Do you think it's the pipes that loose then ?