Abstract: A sealed attic insulating and roof ventilating system includes a plenum formed in part by a barrier material attached to adjacent pairs of rafters and having a radiant or reflective upper surface and a corrugated lower surface to which an insulation material may be secured. This arrangement creates an uninterrupted air chamber or ventilation plenum between the barrier material, the adjacent rafters, and the roof decking through which exterior air can circulate unimpeded from the lower vents to the upper vents of the roof. The circulation through the ventilation plenum prevents moisture from accumulating or condensing under the roof decking and warping the roof decking, which ultimately leads to deterioration of the roof decking and failure of the roof covering, and eliminates ice damming on the top surface of the roof covering.

Abstract: A barrier material has an upper, radiant barrier layer and a lower, corrugated surface layer. The radiant barrier layer is preferably a metalized film or an aluminum sheet with an emissivity rating 0.1 or less. The metalized film is laminated to one side of a middle layer using a high, heat-resistant adhesive. The corrugated surface layer, which can receive an insulating material, is preferably a corrugated medium. The corrugated medium is laminated to the other side of the middle layer with a water-resistant adhesive. The middle layer is preferably a fire-resistant, kraft linerboard. The barrier creates an air space or plenum between an external structure and the insulating material designed to prevent heat transfer between an insulated space and the external structure.