Unusual Copper Pipe Corrosion

[snowhead]

Did you look for a leak anywhere else?
It could be a soldered joint that's now sealed with calcium.

 

[Dan1990]

I think I’ve found the source of the original leak upstairs. I lifted the floorboards this evening above where the pipe enters the ceiling void and I can see where a section of plasterboard has been replaced and a section of new pipe. I guess someone had a leak and did not immediately notice.

The central heating is unvented and maintains its pressure so I’m pretty sure it’s leak free at the moment.