Hi the wall between two rooms (front and middle room) in my early 1900s terrace is quite damp along the length of it. I know it had some sort of new damp course in the external walls in about the 80's and I had a damp survey when I bought it in 1999 which was fine, so what could be causing the damp in this particular wall? The floors are concrete in both rooms. Any ideas would be gratefully received.
Hello, hope I can help. Obviously this could be a number of things but let's start at the bottom. Obviously this could just be an age related problem where the 80's damp course has just run its course. My self personally I would firstly investigate the render at the base of the wall. You mention that both rooms have concrete floors, check that the render is not in contact with the concrete It's a common mistake that people make rendering all the way to the floor Ideally you'd want about a 50mm gap between render & floor as if the physical membrane under the floor has been compromised then moisture could easily track up into the plaster. Pop the skirting off and see what you've got
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