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Hi can any one offer any advice I am renovating a victorian semdetached house I want to insulate the internal walls by fixing insulated plasterboard to the walls I intend to use foam fix and mechanical wall fixings to attach boards to walls does any one know is it best to remove existing lime plaster or leave it in place , it is in good repair not loose or damp but if I leave it will it draw damp behind boards and if I remove it will it cause problems in the wall thanks for any help or advice keith