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Damp Proofing Question
Do i use permaseal damp proof paint under a render?
I've just bought an old cottage that requires quite a bit of work including some damp proofing. After several (expensive) quotes I thought I'd investigate myself. After hacking off the render back to the original stonework the walls look pretty good and are mostly dry apart from a few areas that do show bad quality old pointing with obvious damp issues.
My question is; could I use a Permaseal type damp paint to act as a barrier on the original stone and then render and plaster over it or is there a better method?
If the stonework is dry why does it need "damp proofing"? Was the plaster contaminated? Is it pointing in the stonework allowing penetration dampness? Was the plaster a cement based product or lime based? You need to analyse a myriad of things before carrying out carte blanche recommendations.
Answered 30th Apr 2013