The shape body is industrially precast. A hollow body is suspended on the brick work. The back of this hollow body which faces the brickwork is water impermeable. The side border is of a fire proof, inorganic material. The body comprises a water-proof layer and is built together with a weather proof plate which has a ventilation channel. The weather proof plate has two level, large, bevelled plates which are connected to each other. The hollow body id filled with thermal insulating material.
