The highly insulated roof structure with a total depth of 315mm, consists of rafter depth of 240mm in-filled Passivhausdämmwolle with ECOSE technology, together with an additional 40mm of insulation below the rafters and 35mm of wood fibre panels on top of the rafters, with a U Value of 0.111 W/m2K, finished with a wide range of clay tiles to select from.