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An insulative roof structure for application to a roof deck comprises a rigid foam panel having an upper surface and a longitudinal groove opening onto said upper surface. A rigid elongated strip having an upper surface is positioned within the groove with the strip upper surface being generally flu

An insulative roof structure for application to a roof deck comprises a rigid foam panel having an upper surface and a longitudinal groove opening onto said upper surface. A rigid elongated strip having an upper surface is positioned within the groove with the strip upper surface being generally flush with the panel upper surface. A kraft board lamina including barrier means is bonded to the panel upper surface. A mechanical fastener extends through the lamina, the strip, the panel and into the deck for retaining the panel against the roof deck. A weather resistant membrane is adhesively bonded to the lamina.

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1. An insulative roof structure for application to a roof deck comprising: (a) a single-layer synthetic organic polymer closed cell foam panel including an upper surface, a pair of opposite edges and a longitudinal groove opening onto said panel upper surface; said groove extending generally para

1. An insulative roof structure for application to a roof deck comprising: (a) a single-layer synthetic organic polymer closed cell foam panel including an upper surface, a pair of opposite edges and a longitudinal groove opening onto said panel upper surface; said groove extending generally parallel to and in spaced relation from said edges; (b) an elongated strip of rigid reinforcing material positioned in said groove and having a strip upper surface generally flush with said panel upper surface; (c) a lamina comprising a lower layer of kraft board and an upper layer of metal foil bonded directly to said kraft board, said kraft board layer being bonded to said panel upper surface; (d) a plurality of mechanical fasteners for retaining said panel against a roof deck, each of said fasteners including: (1) a head portion engaging said lamina metal foil upper layer; and (2) a shank portion extending through said lamina, said strip and said panel; said fastener shank portion being embedded in said roof deck whereby said insulative roof structure is retained on top of said roof deck; and (e) a single-ply elasto-polymeric weather-resistant membrane including a plasticizer, said membrane overlying and being bonded to said metal foil layer by an adhesive; said metal foil layer providing a barrier between said foam panel and said plasticizer in said membrane and said metal foil layer providing a base for said adhesive whereby said membrane is bonded to said lamina; said membrane being exposed and substantially uncovered. 2. The roof structure as set forth in claim 1 which includes: (a) said strip being comprised of wood and having a rectangular cross-sectional configuration; and (b) said groove having a rectangular cross-sectional configuration corresponding to said cross-sectional configuration of said strip; and wherein (c) said mechanical fastener shank portion being threadedly engaged in said roof deck. 3. The roof structure as set forth in claim 2 which includes: (a) anchor means positioned in said roof deck for receiving said fastener shank portion. 4. The roof structure as set forth in claim 1 wherein said panel is rectangular and includes: (a) a pair of opposite end edges; (b) a pair of opposite side edges; (c) said groove extending between said pair of end edges and generally parallel to and spaced from said pairs of side edges. 5. The roof structure as set forth in claim 1 wherein: (a) said closed cell synthetic organic polymer comprises expanded polystyrene; and (b) said paper pulp material comprises kraft board treated with a sodium sulfate solution. 6. The roof structure as set forth in claim 1 which includes: (a) indicia printed on said lamina and designating the position of an associated elongated strip therebeneath when said foil layer is in overlaying relationship with respect to said associated strip. 7. The roof structure as set forth in claim 1 which includes: (a) a layer of fire-resistant material positioned between said roof deck and said panel. 8. An insulative roof structure for application to a roof deck comprising: (a) a single-layer synthetic organic polymer closed cell foam panel including: (1) an upper surface; (2) a pair of opposite ends; (3) a pair of opposite side edges; and (4) a plurality of spaced longitudinal grooves each extending between said pair of end edges and generally parallel to and spaced from said pair of opposite side edges, said grooves opening onto said panel upper surface; (b) a plurality of elongated wood strips each positioned in a respective groove and having an upper surface generally flush with said panel upper surface; (c) a lamina comprising a lower layer of kraft board treated with a sodium sulfate solution and an upper layer of metal foil bonded directly to said kraft board; said kraft board layer being bonded to said panel upper surface; (d) a plurality of mechanical fasteners for retaining said panel against a roof deck, each of said mechanical fasteners including: (1) a head portion engaging said lamina metal foil upper layer; and (2) a shank portion extending through in overlying sequence said lamina, a respective elongated strip, said panel and into said roof deck, said shank portion being embedded in said roof deck; and (e) a single-ply elasto-polymeric weather-resistant membrane overlying and being adhesively bonded to said metal foil layer. 9. The roof structure as set forth in claim 8 which includes: (a) anchor means positioned in said roof deck for receiving said fastener shank. 10. The roof structure as set forth in claim 8 which includes: (a) a layer of fire resistant material positioned between said roof deck and said panel.