I had a white, chalky substance on one side of an interior wall. On the other side of the wall, there's a radiator (an almost floor to ceiling radiator).
The white chalk is smack bang in the middle of the radiator, but low to the ground.
I was wondering if anyone had any ideas on if this is likely a radiator pipe leaking? Radiator and pipe work has only been in for 2-3 years, wall hasn't been damaged or knocked.
Oe is it likely to be something else? Paint has only been on it for 3-4months or so. Could it be something to do with the paint?