The invention relates to a siding device (1) for at least one portion of a building, said siding device (1) comprising at least one mounting to be secured to said building, as well as at least one insecticide treatment for said mounting. Said siding device is characterised in that the insecticide treatment consists of at least one mosaic (8) comprising a plurality of areas (6； 7): which are defined at least on the surface of the mounting； each of which (6； 7) comprises a treatment for the mounting using insecticide that does not have a repellent or irritant effect； and which are arranged such that two adjacent areas (6； 7) of the mosaic (8) comprise a treatment for the mounting using a different insecticide.
