Coping Cover is made of 28 or 26 Gauge Galvanized or Zincalume Steel, 10' long. Horizontal top surface of the wall is the most vulnerable point for water to penetrate. The effective way to waterproof this area is to cap the wall with formed metal coping. This is the most common type of parapet wall metal coping. For architectural, residential, and commercial roofing. ASTM A-653, ASTM A-792