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Thanks for all your advice

Thanks for all the replies. Do I tape the oustide of the celotex/kingspan foil? (E.g. the foil side under the OSB/Ply boards) Or should it be on the side next to the plasterboard (which for the moment I was hoping not to removed). Good idea about using insulated plasterboard on the...

The complete rear section of the 2nd floor of our house is timber framed and is very cold in the winter. It consists of foil backed plasterboard, a thin covering of mineral wall within a 100mm cavity, membrane and then weatherboard. We are going to replace the weatherboard with tiles and...