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A prefabricated multi-layer roofing panel is utilized in a roofing system for low-slope roofs. The prefabricated roofing panel includes: an insulation layer that may have a self-adhering means on its bottom major surface for securing the roofing panel to a roofing substrate; a cover board that overl

A prefabricated multi-layer roofing panel is utilized in a roofing system for low-slope roofs. The prefabricated roofing panel includes: an insulation layer that may have a self-adhering means on its bottom major surface for securing the roofing panel to a roofing substrate; a cover board that overlies and is bonded to the insulation layer, and a waterproofing membrane that overlies and is bonded to the cover board. The waterproofing membrane may have waterproofing membrane overlaps for overlapping and being bonded to the waterproofing membranes of other roofing panels in the formation of a roofing system. Preferably, the insulation layer includes interlocking structure for interlocking the prefabricated multi-layer roofing panels together in the roofing system.

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What is claimed is: 1. A roofing system for a low-slope roof, comprising: a low-slope roof deck substrate overlaid by a plurality of prefabricated multi-layer roofing panels; the prefabricated multi-layer roofing panels being secured to the substrate; and the prefabricated multi-layer roofing panel

What is claimed is: 1. A roofing system for a low-slope roof, comprising: a low-slope roof deck substrate overlaid by a plurality of prefabricated multi-layer roofing panels; the prefabricated multi-layer roofing panels being secured to the substrate; and the prefabricated multi-layer roofing panels each comprising: an insulation layer; the insulation layer being a low-density predominantly polymer material foam layer having a density less than 6 lbs/ft3 and a thickness between about 0.50 inches and about 6 inches; the insulation layer having a length, a width, and a thickness; the insulation layer having a top major surface and a bottom major surface that are each defined by the length and the width of the insulation layer; the insulation layer having a first pair of edges that are each defined by the length and the thickness of the insulation layer; the insulation layer having a second pair of edges that are each defined by the width and the thickness of the insulation layer; the bottom major surface of the insulation layer forming the bottom surface of the prefabricated multi-layer roofing panel and having self adhering adhesive thereon for adhering the prefabricated multi-layer roofing panel to the roofing substrate; a cover board; the cover board being a high density predominantly polymer material layer having a density between 6 lbs/ft3 and 25 lbs/ft3 and a thickness between about 0.08 inches and 0.75 inches; the cover board having a length, a width, and a thickness; the length and the width of the cover board being substantially equal to the length and the width of the insulation layer; the cover board having a top major surface and a bottom major surface that are each defined by the length and the width of the cover board; the cover board having a first pair of edges that are each defined by the length and the thickness of the cover board; the cover board having a second pair of edges that are each defined by the width and the thickness of the cover board; a waterproofing membrane; the waterproofing membrane having a length and a width; the waterproofing membrane having a top major surface and a bottom major surface that are each defined by the length and the width of the waterproofing membrane; the waterproofing membrane overlying the top major surface of the cover board and being bonded to the top major surface the cover board; and the prefabricated multi-layer roofing panels being bonded to the low-slope deck substrate by the self-adhering adhesive on the bottom major surface of the insulation layer of the prefabricated multi-layer roofing panel. 2. The roofing system for a low-slope roof according to claim 1, wherein: the insulation layer is a low-density predominantly polymer material foam layer with inorganic filler; and the cover board is a high-density predominantly polymer material layer with inorganic filler. 3. The roofing system for a low-slope roof according to claim 1, wherein: the waterproofing membrane extends beyond the top major surface of the cover board along one of the first pairs of edges and along one of the second pairs of edges of the cover board to form waterproofing membrane overlaps for overlapping and being bonded to the waterproofing membranes of other of the prefabricated multi-layer roofing panels in the formation of a roofing system; and the waterproofing membrane overlaps of each prefabricated multi-layer roofing panel overlap and are bonded to the waterproofing membranes of other of the prefabricated multi-layer roofing panels in the roofing system. 4. The roofing system for a low-slope roof according to claim 3, wherein: at least one of the pairs of insulation layer edges of each of the prefabricated multi-layer roofing panels have interlocking means for interlocking the insulation layer of the prefabricated multi-layer roofing panel with the insulation layers of other of the plurality of prefabricated multi-layer roofing panels and each of the prefabricated multi-layer roofing panels are interlocked by the interlocking means to other of the plurality prefabricated multi-layer roofing panels in the roofing system.