| abstract |
The invention concerns a complex insulating material for example for roof cover supports or walls, comprising several layers of different materials, characterised in that the layers are welded together and at least one of the layers is made up of a fibrous material of animal origin (8), for example wool, associated with a fusible material capable of being welded. The invention concerns also a method for making said material, characterised in that the welding is performed by means of powered welding rollers. |