Patent ID: 8479467

Claim:
A prefabricated roofing system panel comprising: a cover board; the cover board comprising a high-density predominantly polymer material core layer; the high-density core layer of the cover board having a density between 6 lbs/ft 3 and 25 lbs/ft 3 ; the high-density core layer of the cover board having a length, a width, and a thickness; the high density 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 high density core layer, wherein the high-density predominantly polymer material of the cover board core layer comprises polyisocyanurate; an insulation board, the insulation board comprising a low-density predominantly polymer material foam core layer; the low-density foam core layer of the insulation board having a density less than or equal to about 2 lbs/ft 3 ; the low-density foam core layer of the insulation board having a length, a width, and a thickness; the low-density foam core layer of the insulation board having as top major surface and a bottom major surface that are each defined by the length and the width of the low-density foam core layer; and the bottom major surface of the high-density core layer of the corer board being bonded to the top major surface of the low-density foam core layer of the insulation board; and the bottom major surface of the high-density core layer of the cover board and the top major surface of the low-density foam core layer of the insulation board being substantially coextensive.