On the outer wall of my basement I have a couple of wet spots which I am trying to understand if they are drying up or not. ( I like to believe that I eliminated the source of water which was an incorrectly sloped patio) In order to determine if they are drying up in time I marked their margins with white chalk.
It has been some time since I did that and I do not see any change. Very dry weather here in Toronto or heavy rain left these spots unchanged.
In order to see if they are actually wet spots and not just some sort of darker mineral salt I would like to try to dry up one of these with a plumber torch
I am wondering if there could be any potential problems with doing this. Do you see any?
thanks in advance