How thick is most roof sheating?

Most roof sheathing is typically made from plywood or oriented strand board (OSB) and is usually around 1/2 inch to 3/4 inch thick. The specific thickness can vary depending on local building codes, the type of roofing material being used, and the structural requirements of the roof. Thicker sheathing may be used in areas with heavy snowfall or extreme weather conditions to provide additional support.