Shadowline sheet is one of the most different corrugated designs that has a classic design similar to a trapezoid. This sheet has been used as a top layer of roofing sandwich panels for many years. There are many benefits in using Shadowline sandwich panels. Increasing the resistance of the roof of the structure to physical damage, high resistance of this sheet to moisture, no breakage, quick and easy installation, high variety in design and color are the advantages of Shadowline sandwich panels.In the past, the classic Shadowline sheets were mostly used for execution on roof sandwich panels, but today, the applications of this sheet have expanded a lot and it can be implemented on different roofs. The issue in the production of these sandwich panels is the number of trapezoids created in the sandwich panel. The more trapezoids in the sandwich panel are used, the stronger the panel would be. A Shadowline roof sandwich panel must withstand the maximum pressure of live load and dead load imposed on the roof, so its sufficient strength and durability is of particular importance. To produce Shadowline roof sandwich panels, several trapezoids are created through cold rolling methods on the sheet.