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- 19 Jan 2008
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I am a great believer in poly backed plaster board when dot and dabbing a non cavity wall, I live in a Victorian house with 20" walls and I have scratched them with sand and cement and applied poly backed dot and dabbed to the walls (down stair walls) which were pulling up moisture from the ground This was done a number of years ago and have had no problem since, I hasten to add that one of the rooms has become a "storage" room where most of our "odds and sods" are stored and even tho I don't put the rad on in that room there is no evidence of damp or mould, My thoughts on this is, that the water will still track up and down the wall but even tho the dabs must get wet it doesn't show thru the poly back. I know the wall behind had moisture in when I did it and still probably got moisture in it now so is the thermal value of the polyback stopping the dabs breaking down and coming away from the scratch and the poly back and keeping an even temperature between the dabs and the wall? I don't know the answer to this and I don't really dig to far into the question, but I know it is working on my house