4 LDK   Gross floor area Ground floor 1F 127 sqm 1st floor 2F 24 sqm Total 151 sqm U-VALUE ROOF 0,14 - 0,16 W/m2 °K Insulation 300 mm U-VALUE WOODEN WINDOWS 1,3 W/m2 °K Double glazed, selective + argon U-VALUE WALL 0,22 - 0,28 W/m2 °K Insulation 200 mm U-VALUE FLOOR 0,20 W/m2 °K Insulation 200 mm