Abstract: A method of and apparatus for manufacturing a roofing of sheet metal, where a sheet in a first step is preformed so as by a first operation perpendicular to its surface extension, the sheet is provided with a contour of wave-shape and in a second step, is provided with step-shaped jags of a predetermined step height by means of a pressing tool, which comprises at least one first and one second pair of tools movable to and from each other, the preformed sheet being held down by each tool pair, whereafter the tool pairs are moved relative to each other through a distance corresponding to the step height, so that the sheet by the second operation which is in a direction perpendicular to the surface extension of the sheet and to said first cut is provided with a step-shaped portion across the wave-shaped sheet, whereafter as a third operational step, the preformed sheet is advanced through a predetermined adjusted distance, and thereafter the second operational step is repeated to make a next step in the sheet.

Abstract: A method, and an apparatus for carrying out that method, for making roofing from a stretchable and deformable sheet material. The roofing sections are made from sheet material which has a preformed laterally sinu-soidal configuration which is reconfigured with longitudinally spaced steps (or folds). The finished sheet is a roofing section having the configuration of stepped tile roofing which is a substitute for true roofing tile. The sinu-soidal sheet is clamped (or pressed) in a tool between two adjacent pairs of complimentary shape clamping jaws. In that tool apparatus the two pairs of clamps are then moved relative to each in parallel paths normal to longitudinal and lateral planes through the sheet, which movement stretches the sheet to form a step (or fold) between the portions held in the two sets of clamps.