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Insulation

I live in a "Cornish house" The House used to be PC concrete on the ground level . This was changed to Cavity( brick & thermalite) in the '80s. The 2nd floor is tiled with an air cap that runs all around the house. I have learned the top is insulated with polystyrene & plasterboard on one side, but the other side is just Plasterboard!!!. Can I overboard with thermal plasterboard or do I have to rip all of the plasterboards off ( I hope not) to achieve some type of thermal insulation for the house?
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