Hi, I'm hoping someone will have some suggestions!
I have a small cottage built circa 1853 with 12-15 inch thick stone walls (no cavity) which is rendered to the outside. In the second bedroom in the bottom corner of the gable end there seems to be a damp patch forming, it feels cold to touch but most of the walls in the house do. I've checked the room underneath in the same corner but there is nothing. I'm really confused as I cannot see any damp patches in the render either. I have also noted there are a few wood lice in the same corner of this room, if anyone has any suggestions I would be really grateful!