Johns Manville Vented Nailboard® 3" x 4 'x 8' R-8.8

Vented Nailboard® is a rigid roof insulation board composed of a closed cell polyisocyanurate foam core attached with spacers to 7/16-inch (11 millimeters) or 5/8-inch (16 millimeter) oriented strand board (OSB) on one side and a universal fiberglass reinforced facer on the other. The polyiso component of Vented Nailboard® uses an environmentally compliant blowing agent containing pentane hydrocarbon to enhance the thermal performance of the foam insulation.