Patent ID: 8141313

Claim:
A roofing system comprising: a plurality of roofing panel assemblies, each roofing panel assembly having: a base having a substantially planar surface; a plurality of I-joists having an upper flange, a lower flange, and a web, wherein the base is attached to the lower flanges of the plurality of I-joists; and a cap having a substantially planar surface, wherein the cap is attached to the upper flanges of the plurality of I-joists; wherein the plurality of I-joists includes a first edge most I-joist and a second edge most I-joist, wherein a first edge of the cap is attached to the upper flange of the first edge most I-joist such that a portion of the upper flange of the first edge most I-joist is not covered by the cap, the portion defining a first distance, and wherein a second edge of the cap extends beyond an edge of the second edge most I-joist for a second distance less than a width of the upper flange of the second edge most I-joist; wherein the second distance is also less than or equal to the first distance; wherein a first edge of the base is attached to the lower flange of the first edge most I-joist such that the first edge of the base extends outwardly no further than an edge of the lower flange of the first edge most I-joist; wherein a second edge of the base is attached to the lower flange of the second edge most I-joist such that the second edge of the base extends outwardly no further than an edge of the lower flange of the second edge most I-joist; and wherein adjacent roofing panel assemblies are attached such that the second edge of the cap engages the portion of the upper flange of the first edge most I-joist not covered by the cap.