The invention relates to a fastening system for large-area roof coverings or wall claddings.
The object is to create a fastening system which is structurally simple, consists of few parts, is fast to install and is suitable for high negative wind loads.
Fastening is achieved within two upwardly projecting longitudinal ribs 2, which are formed by upwardly projecting sheet metal flanks 11. These sheet metal flanks 11 are bent up and provided with projections 13. According to the invention, T-shaped base bars 3 are disposed and fastened within the upwardly projecting longitudinal ribs 2, either continuously or only in some places. The horizontal wide limb of the T-shaped base bars 3, designated as foot limb 5, can be disposed upwardly or downwardly. The T-shaped base bar 3 has recesses 6 formed left and right in the vertical limb of the T-shaped base bar 3 and reaching into the foot limbs 5. Specially formed projections 13 of the sheet metal flanks 11 of the roof elements, sheet metal plates or sheet metal strips 1 engage in these recesses 6. These preformed projections 13 result in a form-fitting joint in conjunction with press plates 9 that can be disposed at or on the central limb 4. The press plates 9 are appropriately fastened with the base bar head 7 in a form-fitting manner or, for example, with screws. The press plates 9 are formed such that the press plates 9 span over the projections 13 of the sheet metal flanks 11 of the roof elements, sheet metal plates or sheet metal strips 1 positioned side by side. This creates a durable form-fitting joint by means of the T-shaped base bar 3 (or base element), central limb 4 and press plate 9. At the upper ends of the upwardly projecting lateral sheet metal flanks 11, the whole longitudinal rib is closed towards the top with a cover strip 12.