Vented insulated roof sheathing

An integrated roofing panel system, comprising:

• two or more engineered wood roof sheathing base panels comprising lignocellulosic material, with an inner face and an outer face;
• and
• a foam insulation layer with an inner face and an outer face, disposed on the inner face of the roof sheathing base panel, wherein the roof sheathing base panel and the foam insulation layer are pre-formed into an integrated multi-layer arrangement;
• wherein the foam insulation layer comprises a plurality of parallel channels running continuously from a first edge of the foam insulation layer to a second edge of the foam insulation layer, wherein the first edge is opposite the second edge, wherein the plurality of parallel channels in the foam insulation layer are not in connection with each other;
• and
• wherein the plurality of parallel channels have openings at the first edge and the second edge, and said openings are adapted to meet corresponding openings on an adjacent integrated roofing panel when said adjacent integrated roofing panels are placed with respective said first edges in contact with respective said second edges, thereby forming a continuous air passageway through corresponding said plurality of parallel channels;
• and
• at least one modified engineered wood roof sheathing base panel comprising one or more facial openings at the first edge of the corresponding foam insulation layer, said facial openings extending from the inner face of the corresponding foam insulation layer to some or all of the corresponding plurality of parallel channels.