Ceiling adjacent to un-heated space can be thermally insulated from underneath or from above. Thermal bridges on a junction to the external walls should be solved in both cases.

Ceiling adjacent to un-heated space. Vapour barrier under thermal insulation FIBRANxps 300-L, and acoustic insulation foil, which also acts as a sealing foil, FIBRANxpe, above it. More...

Ceiling adjacent to cold, non-walk-on attic More...