Creaking waste pipe

[ss]

I suspect this is expansion it sounds like an expansion noise that from zero accelerates as water runs out then deaccelerates as it cools, noise stops after a couple of minutes. Thats what I think it is. It is the pipes in an upstairs bathroom If I have shower with the bath plug in there is no noise but when I pull the plug out the noise starts as this is hot water from the shower I suspect expansion noises, if I half fill the bath with cold water and drain there is no noise. So when I get the enthusiasm to have a look under the bath what should I be looking for and how to fix the noise. If its an expansion noise can it be fixed? Never had thisin my last house and the problem here is I can hear it from my bedroom which is now beginning to annoy me.

[Andy Burns]

If the pipe is tight onto some woodwork, try to work some sort of wading (old style underlay, rockwool, strip from an old towel) between pipe and wood.

[harryagain]

Or spray with WD40

[Dave Liquorice]

Or sprinkle it with talcum powder, better still move the pipe so it's clear or remove some of the wood. Constant movement against something will wear through the pipe eventually.

[ss]

Thanks guys, its a 2 minute job to take the bath panel off and spray with WD40 whatever I can see, if that helps I have then found the problem and can sort it properly later.

[ss]

Took the bath panel off and there is no contact with wood or anything else the waste goes directly (via u bend) into the downpipe. I sprayed it all with wd40 anyhow and will see if it makes any change.