An insulating
radiant barrier sheathing product formed by directly bonding or applying an insulating
radiant barrier (IRB) material to the interior surface (i.e., facing the
attic or other
interior space) of a wood, wood-based, manufactured wood, or cellulosic panel or structural or sheathing panel. The IRB panel product may be used as a roof sheathing panel, with one or more outer protective and finishing
layers applied to the outer surface, such as, but not limited to, an underlayment and roofing
shingles. The IRB material may comprise a mixture of a
radiant barrier (RB) paint and a granulated insulating material. The granulated insulating material may comprise
cork, EPS, XPS, poly-iso, other similar insulating material, or combinations thereof. Alternatively, the IRB material may comprise a reflecting bubble-wrap layer.