Roof Jack T-Tops Noth California Style are made of Galvanized steel or Aluminum, Option bases: Regular and Shake Base. Pitch is Flat-to-5/12. The T-Top is a 1-piece roof exhaust with a low profile designed for bath, dryer, kitchen or other exhaust ducts terminating up through the roof. The top shield contains and distributes exhaust evenly in opposite directions. For architectural, residential, and commercial roofing. For Galvanized Steel: ASTM A-653, ASTM A-792