The improvement of housing envelopes can play an important role to change the image of the building, to modify the use inside the dwelling, to transform the immediate surroundings of the buildings, to improve the technical and functional performance of the building and to enhance the life environment of inhabitants. In this perspective, and since 1980 in France, rehabilitation of façades has been one of the predominant measures applied to modify, from outside, the image of the building without perturbing the life of inhabitants. From a technical point of view, the main technique used that consists in applying to the existing façade an external skin including thermal insulation offers numerous technical and functional advantages.