Patent ID: 7476427

Claim:
A method of manufacturing an insulation product comprising the steps of: forming a web of randomly oriented fibers on a forming belt, said fibers being coated with a heat curable binder, said web generally having a first major surface and a second major surface and a pair of side portions, wherein said web has a higher percentage by weight of said heat curable binder in a region of said web proximate to at least one of said major surfaces compared with a total percentage by weight of said binder in said web, compressing and heating said web to form a sheet of said randomly oriented fibers bonded by said heat curable binder, said sheet having first and second major surfaces and a pair of side portions; and affixing a facing layer to said at least one of said major surfaces of said sheet, wherein a region of said sheet proximate to said facing layer is more puncture resistant than a remainder of said sheet.