Can anyone tell me why my cold water supply pipe bangs from time to time (ie several times a day). I've tried closing the stopcock slightly but this hasn't helped. Any ideas??
This is known as water hammer and occurs when the cold water tap is turned off quickly thus causing a sudden increase in pressure in the pipe which inturn causes the pipe to vibrate.
Check for loose pipework which should be clipped at distances of a min 1.2m apart horizontally and 1.5m virtically.
It's wierd though that the heating isn't on and the banging is very close to where the stop-**** is. It's as though the external pressure is dropping/increasing. Maybe I'll check the neighbours to see if they get it too.
We sometimes are aware of a similar situation, often late at night, when it can only be related to our next-door neighbours use of water. It can be a bit weird at times but there has to be a bit of movement somewhere in the mains pipe.