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@starfish&coffee
Another 'moisture in my flat' question:
I just started hacking off the tiles in my bathroom in order to re-tile, but once down to grit and plaster I find that there is moisture in the plaster, especially to the left of the window and concentrated mostly at the lower part of the wall.
The soggy plaster comes off easily of course, but I hesitate to continue with the work before I can understand two things:
1) How can I make 100% sure I understand where the moisture comes from? I am fairly sure it has to do with the clumsy construction of the windowsill (wood in zone 3 of a bathroom) but are there other possibilities?
2) Once wet plaster is off, will I need to worry about moisture damage to the concrete behind it? The concrete looks fine so far and no smell of fungus, but I don't want risk re-plastering and potentially sealing in something damaged.
Any tips as to rebuild/recreate windowsill with concrete and tiles will be much appreciated.