An insulation system includes a first insulation panel having a thickness of 0.4 inches to 6 inches, a second insulation panel including a first side and an opposite second side, a third insulation panel, a first material contacting the first side of the second insulation panel, the first material connecting the first insulation panel to the second insulation panel, and a second material contacting the second side of the second insulation panel, the second material connecting the second insulation panel to the third insulation panel, the insulation system positionable between a folded configuration in which the first insulation panel, the second insulation panel, and the third insulation panel are stacked, and an unfolded configuration in which the first insulation panel, the second insulation panel, and the third insulation panel are unstacked.

A roofing system including a plurality of photovoltaic modules installed on a roof deck, where each of the photovoltaic modules includes at least one solar cell, and a plurality of metal roofing shingles installed on the roof deck adjacent the plurality of photovoltaic modules, where the plurality of metal roofing shingles includes at least a first metal roofing shingle and a second metal roofing shingle, where each of the metal roofing shingles includes a first layer that includes a metal material, and a second layer that includes a polymer material, where the second layer includes a nail zone with a plurality of fasteners extending therethrough, fastening the metal roofing shingle to the roof deck, where the second layer is between the roof deck and the first layer.

A roofing system, including at least a first, second, and third metal roofing shingle installed on a roof deck adjacent to a plurality of photovoltaic modules, the first and second metal roofing shingles installed in a first row on the roof deck, the third metal roofing shingle installed in a second row on the roof deck, each of the metal roofing shingles including a metal layer and a cover layer, the metal layer including a conductive metal, the cover layer overlaying a portion of the metal layer and exposing at least one side lap of the metal layer, the side lap of the metal layer of the second metal roofing shingle overlaying and in electrical contact with the side lap of the metal layer of the first metal roofing shingle, to form a first grounding path, and the third metal roofing shingle in electrical contact with the first metal roofing shingle, to form a second grounding path.

A roofing system, including at least a first, second, and third metal roofing shingle installed on a roof deck adjacent to a plurality of photovoltaic modules, the first and second metal roofing shingles installed in a first row on the roof deck, the third metal roofing shingle installed in a second row on the roof deck, each of the metal roofing shingles including a metal layer and a cover layer, the metal layer including a conductive metal, the cover layer overlaying a portion of the metal layer and exposing at least one side lap of the metal layer, the side lap of the metal layer of the second metal roofing shingle overlaying and in electrical contact with the side lap of the metal layer of the first metal roofing shingle, to form a first grounding path, and the third metal roofing shingle in electrical contact with the first metal roofing shingle, to form a second grounding path.