Superior Corrosion Resistance:Zinc Aluminum Coating lasts 2–4 times longer than galvanized steel, particularly in harsh environments. Engineered reinforcing ribs design provides maximum wind uplift rating 22ga. steel provides increased protection against corrosion. During installation, slight indentations should be visible around the plate, or in very hard areas, attention should be paid to whether the plate has any indentations. This plate needs to penetrate the steel deck by at least 19 millimeters. Do not overtighten the spacer to avoid damaging the underlying layer.