Internal wall crumbling, pipe behind wall has turned green but is not wet. Ideas?

[Tom079555]

The top corner of my kitchen wall started to crumble a bit. I used a paper scraper to remove it.

There is a radiator/water pipe behind this section of wall. The pipes have turned green but are not wet. In fact, nothing there appears to be wet, but that corner of wall is almost dust now.

I have even removed the floorboards upstairs, and can see the pipes from above going down which are all perfectly dry.

Do you think it is something to do with the material used to patch the wall that is not agreeing with the metal in the pipes?

Ideas welcome.

 

[motorbiking]

Its possible the radiator pipe only leaks when the central heating is on and the water pumping or hot.

 

[Tom079555]

I'm trying not to turn the heating on this year - haha

 

[Harry Bloomfield]

Do you think it is something to do with the material used to patch the wall that is not agreeing with the metal in the pipes?

I would suggest your problem there is expansion and contraction of the pipes, as they heat up and cool down. Any attempt to plaster directly over them, is doomed to failure. Better would be to simply box them in, so they have some freedom to move.