Yosemite® Venting Base Sheet

CertainTeed Yosemite Venting Base Sheet is designed for use as a buffer sheet over existing roofing membranes in lieu of a divorcing layer of roof insulation on re-cover projects where the existing roofing membrane is left in place. It is suitable for use over existing gravel, mineral or smooth surfaced roof systems and is substituted for the base ply of the new membrane.