The width varies greatly, depending on the style of roofing. The width is measured simply straight across the top of the sheet, from edge to edge, to indicate the coverage width of the sheet.
End flashing roofing sheets are among the most durable of roofing materials. This is due to their form factor being purposely crafted to maximize overall strength and withstand tough conditions. All the while, many end flashing roofing sheets are incredibly lightweight. This makes them suitable for a wide variety of structures.