SRD's non-perforated gasket is a special gasket used to fix thermal insulation materials and waterproofing membranes. The raised circle is the area where the gasket and the bottom layer of the membrane are welded. Because the coil is not perforated, the circular gasket and the coil are evenly welded and evenly distributed on the entire roof. When the wind load acts on the coil, the force is more reasonable and even, so that the roof's wind resistance rises to a new level, and the top is more beautiful.