Products / Elevate Channel Venting Base

An oxidized asphalt-coated fiberglass base sheet with granules on the underside embossed in a light grid pattern to vent latent moisture, and a sanded top surface. It is mechanically fastened over lightweight concrete decks or other surfaces as a base for Elevate modified bitumen or built-up systems. The Asphalt Product Guide lists it as ASTM D4897 Type II, 115 to 120 mil, in 3 foot 3 inch by 32 foot 11 inch rolls covering 100 square feet.