Barcelona, Capistrano, Malibu, Espana, Villa or US-Tile Styles Bird-Stop is made of 28 Gauge Black (Charcoal), Brown or Red (Terra-Cotta) Painted Steel. Bird-Stop metal prevents intrusion under the roofing tile by birds or other wildlife. It also provides proper rise for the eave course, or first row of tile. It is used to close the convex opening below the eave course of all profile tiles, such as Capistrano, Malibu, Espana or Villa profiles. For architectural, residential, and commercial roofing. ASTM A-653, ASTM A-792