My central heating bangs like a maniac on drums, never did get to the bottom of it, after a new pump and a new boiler it still does it, given up now, learnt to live with it.....................
Banging central heating is usually a furred up heat exchanger 'kettling' so needs a descale but as that might make compression joints and glands weep perhaps just clip unsupported runs and not have too many clips on any run(!) - You don't want pipes flopping around but also too many clips can make expansion effects a bit noisy... Or bung in boiler noise reducer, apparently a mild descaler and fairy liquid!
As mentioned, it doesn't appear to be triggered by the toilet being flushed.
In the cellar where the mains comes in, there's a very long straight horizontal section which runs almost from the pavement to the back of the house. It's also 'barely' fixed to the wall (maybe two or three clips over 30foot?)... could it be this?
While your down there, you may find the mains tap? if you can hear the noise, and it's more like a rattling noise rather than banging, stick a screwdriver on the tap and listen through it like you would a stethoscope, this may help you locate the problem.
1 Try to isolate where it is coming from. When it is happening go round the house and touch pipes and try to track where the banging bit of pipe is.
2.Now you can either try to cure an internal problem (furred up pipe or air in pipe) or just stop the pipe moving. Stop it moving and you have no problem.
3. If you can get to the pipe just jam something behind it for now to see that it is the bit. Then fit some more clips to hold it in place better or put a bit of foam between the two banging things.
4. If it is found to be somewhere you cannot get to then as a last resort get a tin of expanding foam and drill a hole to get the nozzle in and squirt it full of stuff (don't drill the pipe!).
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