The substructure is the link between the supporting structure and the façade cladding. This is where the rear ventilation occurs. The façade profiles are attached to the substructure with sufficient distance to the insulation, whereby a constructive separation of the two components is present and an air gap is created. The gap between the two components regulates the moisture balance in the structure. The substructure can be made out of wood or aluminium or a combination of both materials. If an aluminium substructure is chosen, it is possible to permanently compensate for any unevenness in the external wall.