We have a semi-detached house. It sounds like it is from within our house and near to the stopcock mains run which is sited below our pull out larder. I installed this to hide the pipe runs up to the tank in loft.
The only thing (problem) we have is a secondary stopcock had to be fitted...
What could cause the pipes to knock when there is no water running or and the boiler is switched off ??!!
Does this indicate that I have a water leak and the water is refilling, thus causing the knock ?
Any assistance would be very much appreciated.