My house is solid walled house about 100 years old. The back of the
house floor below the window is about 2ft below ground and this wall
on and off suffers from condensation, its has a bitumous barrier
behind the plaster. I wondered about sealing some tri iso super 10
behind plaster board, or plaster backed celotex and attaching (screw
of nail?) to the walls, is this a good idea or do I need an air gap as
well, what would people recommend?
Thanks