High R-value insulated building panel with integrated weather resistant barrier

An energy efficient insulated building panel comprising:

• an insulation layer;
• a rigid sheathing material;
• and
• a weather resistant barrier;
• wherein the panel includes a drainage plane;
• wherein the insulation layer includes a foam insulator wherein the foam insulator includes polyurethane;
• wherein the polyurethane foam insulator is self-adhered to the sheathing material;
• wherein the panel does not include a separate adhesive bonding the polyurethane foam insulator to the sheathing material;
• wherein the panel does not include a stud;
• wherein the panel includes a corrugated, ridged, or grooved surface;
• wherein the weather resistant barrier is wrapped or layered on the corrugated, ridged, or grooved surface;
• wherein a gap between the weather resistant barrier and the corrugated, ridged, or grooved surface defines the drainage plane;
• and
• wherein the polyurethane foam insulator has a flame spread value between about 0 and about 25 as determined by the ASTM E84 procedure and a smoke developed value between about 0 and about 450 as determined by the ASTM E84 procedure.