Patent ID: 7811663

Claim:
A prefabricated roofing system panel comprising: a cover board, the cover board comprising a high-density core layer that is a least predominantly of a polymer material; the core layer of the cover board having a density between 4 lbs/ft 3 and 25 lbs/ft 3 and a thickness of about 0.08 inches or greater; the core layer of the cover board having a length, a width, and a thickness; the core layer of the cover board having a top major surface and a bottom major surface that are each defined by the length and the width of the core layer; an insulation board, the insulation board comprising a low-density core layer that is at least predominantly of a polymer foam material; the foam core layer of the insulation board having a density less than 2.5 lbs/ft 3 and a thickness of about 0.50 inches or greater; the foam core layer of the insulation board having a length, a width, and a thickness; the foam core layer of the insulation board having a top major surface and a bottom major surface that are each defined by the length and the width of the foam core layer; and the bottom major surface of the core layer of the cover board being bonded to the top major surface of the foam core layer of the insulation board; and the bottom major surface of the core layer of the cover board and the top major surface of the foam core layer of the insulation board being substantially coextensive; wherein the polymer material of the core layer of the cover board and the foam core layer of the insulation board is a polyisocyanurate material.