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Concrete flooring in a period property sounds like a recipe for trouble. Funneling moisture underneath the property through to the nearest escape point, the surrounding walls
Would it have had a suspended timber floor previously do you think?
Or if it was a solid floor before it would have most like been breathable.The plaster on the walls - lime or cement/gypsum ?
The latter plaster might exacerbate the issue caused by the flooringVentilation sounds like it's satisfactory by your account but condensation damp is always possible
Concrete? At a guess I imagine it was done by the owner before last but I'll confess I didn't give it enough thought or investigation at the time of purchase.
I'll try and lift a bit of the laminate at some point and have a look. What would I be on the look out for? Cracks?
Another option I'm considering is the quite drastic one of structural remodeling of the space to make it open plan to the hallway, doing away with this wall completely. Would require extending an RSJ insulating the end wall (end of terrace) but I want to do the latter anyway.