Roofing cover board, roofing panel composites, and method

A roofing system, comprising:

• a plurality of insulation boards adapted for overlying a roof deck to form a layer of insulation, each insulation board comprising a foam material including polyisocyanurate or polyurethane, the foam material having a first density;
• and
• a plurality of cover boards adapted for overlying the layer of insulation, each cover board comprising a material including polyisocyanurate or polyurethane, the material having a second density;
• wherein the second density is greater than the first density;
• wherein each insulation board further comprises a fiberglass top facer overlying and bonded to a top major surface of the insulation board;
• and wherein each cover board further comprises a second top facer overlying and bonded to a top major surface of the cover board.

A roofing system, comprising:

• a plurality of insulation boards adapted for overlying a roof deck to form a layer of insulation, each insulation board comprising a foam material including polyisocyanurate or polyurethane, the foam material having a first density;
• and
• a plurality of cover boards adapted for overlying the layer of insulation, each cover board comprising a material including polyisocyanurate or polyurethane, the material having a second density;
• wherein the second density is greater than the first density;
• wherein the first density is between about 1 lbs/ft3 and about 3 lbs/ft3;
• and wherein each of the cover boards has a thickness between about 0.08 inches and about 0.75 inches.