The body of the building is cubic and the surface area, as well as the façades surface, is of 225 m2 with a flat roof. The building envelope is made by a double brick wall with an air cavity and mineral wall (thickness of insulation material 8 cm), according to the local regulation [30], which requires a thermal transmittance of 0.36 W/m2 K for this part of building envelope. Only a façade is supposed to be greened: the one facing south