This architectural drawing is Typical section of roof parts in detail AutoCAD drawing, dwg file, CAD file. A thin sheet of wood known as decking or roof sheathing covers the entire roof frame. Oriented strand board or plywood with a thickness of less than half an inch are frequently used as roof sheathing materials. The layers of a roof, which we discuss below, support the roof frame and decking, which they all sit on top of. For more details and information download the drawing file.