A roofing system for protecting a building comprises a plurality of side-interlocking and front-to-back interlocking roof panels. A top side includes a front flange projecting forward at a front end. One or more gutter panels may be included, each having a top side open to a U-shaped gutter. An interior of each roof panel and gutter panel includes an insulating foam material, and an outer surface includes a rigid shell. The gutter panel is adapted for fixing along an edge of the roof at least partially under the flange of any of the roof panels that are disposed along an edge of the roof. Preferably the roofing system further includes gable cap panels, soffit fascia panels, valley cap panels, and wind breakers for holding the roof panels down to the roof in wind.

A roof panel includes a planar body having top and bottom edges, with a downturn edge extending therebetween, and an opposing channel edge. The downturn edge overlays a channel edge of an adjacent panel. The bottom edge overlays a top edge of another adjacent panel. A plurality of courses extends between the channel and downturn edges. Each course includes a nesting ridge to receive the downturn edge of an adjacent panel and to position a top surface of the panel flush with adjacent panels. Surface channels and contoured ridges are defined within each course. A drain aperture of the drip edge aligns with an adjacent channel edge to direct material through the drain aperture and onto adjacent panels. A gable member engages an edge when the panel has one or fewer laterally adjacent panels, wherein the gable member is flush with the adjacent planar body.

A roof panel includes a planar body having top and bottom edges, with a downturn edge extending therebetween, and an opposing channel edge. The downturn edge overlays a channel edge of an adjacent panel. The bottom edge overlays a top edge of another adjacent panel. A plurality of courses extends between the channel and downturn edges. Each course includes a nesting ridge to receive the downturn edge of an adjacent panel and to position a top surface of the panel flush with adjacent panels. Surface channels and contoured ridges are defined within each course. A drain aperture of the drip edge aligns with an adjacent channel edge to direct material through the drain aperture and onto adjacent panels. A gable member engages an edge when the panel has one or fewer laterally adjacent panels, wherein the gable member is flush with the adjacent planar body.