Upward directed heat losses are the greatest. Prevent air from flowing through the building envelope and causing negative effects on the structure by placing a vapour barrier on the inner side of the roof. In practice, an air infiltration barrier (e.g., plastic foil) provides sufficient air tightness.
Ventilated facades can be designed in many different ways, but all systems should prevent deterioration of the inner shell due to moisture. If the thermal insulation has an open structure, it needs to be shielded with a wind barrier so that the thermal performance of the insulation is preserved.