Abstract: The invention relates to expanded metal mesh consisting of mesh webs and nodes and to a tool for producing said expanded metal mesh. At least some of the mesh nodes are configured as predetermined breaking points (8, 9a, 9b). The expanded metal mesh is produced by a shear blade which has tooth bases of differing depths between the individual teeth on the blade profile.

Abstract: Plastic deformable material web, more particularly bitumen web for use preferably in roofing applications. The material web comprises a modelling mesh as the backing material and at least one plastic deformable covering material layer such as a bitumen layer connected to the mesh. For joining the mesh (4′) to the covering material layer (2′) a thin foam web (3′) is bonded or thermally laminating to the mesh. The foam prevents detachment of the bitumen layer from the mesh due to cold flow and prevents sagging of the bitumen even at high temperatures (FIG. 2).

Abstract: A concrete roofing tile (10) has a thermal conduction device in the form of metal sheets (20a, 20b) attached to its underside. Planar metal contacts (30a, 30b) project from the underside of the sheets and are adapted to clip on a pipe (40) which extends up the roof and carries a heat carrier medium. The pipe is part of grid fixed to a roof structure for collecting heat absorbed by the tiles. The tiles have the appearance of ordinary roofing tiles from the outside.