the damp patch is on the inside wall of my living-room but is an external wall i removed bricks from the outside wall and put my arm inside the wall to feel if the bricks were wet and in insulation but all is dry - my house was build in the 1920s - two years ago i had the room plater boarded and skimed and two months ago i had it reskimed because of work ive had done and now about 3ft from the floor i have this damp patch in the corner wich is about a ft long it drys out but returns in all weathers i have put a coat of paint on an the paint sticks ok but the patch returns - does it sound like a major problem or should i just get a tall corner unit
Damp can get through the cavity if there is a bridge (ie an old brick) accross the cavity. Or in a well insulated house a gap in the insulation can cause a cold spot and result in condensation. Damp plaster will eventually begin to break down, but will also allow fungus to grow and possibly result in a smell. I would get a professional in to look at it, it may be a common problem.