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A roofing structure is disclosed having a layer of blocks of insulating material supported on a roof deck and featuring a hermetic seal encapsulating a limited part of the insulating material layer and which completely envelopes selected insulation blocks covering at least portions of the deck perip

A roofing structure is disclosed having a layer of blocks of insulating material supported on a roof deck and featuring a hermetic seal encapsulating a limited part of the insulating material layer and which completely envelopes selected insulation blocks covering at least portions of the deck periphery to effect wind uplift resistance.

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1. For use in roofing installations providing resistance to wind uplift conditions, a roofing structure comprising a deck, insulating materials supported on the deck and including a multiplicity of individual insulation blocks disposed in overlying relation to the deck, sheet means enveloping a plur

1. For use in roofing installations providing resistance to wind uplift conditions, a roofing structure comprising a deck, insulating materials supported on the deck and including a multiplicity of individual insulation blocks disposed in overlying relation to the deck, sheet means enveloping a plurality of said individual insulation blocks which blocks overlie a portion of the deck, said sheet means defining a panel encapsulating a plurality of individual insulation blocks, said structure further including a plurality of such encapsulating panels which collectively form a wind uplift resistant section of the deck. 2. The wind uplift resistant roofing structure of claim 1 wherein the sheet means comprises gas impermeable sheet means. 3. The wind uplift resistant roofing structure of claim 1 wherein the sheet means comprises a weather resistant membrane loosely laid as a cover in overlying relation to insulating material and a gas impermeable sheet bonded to the weather resistant membrane and cooperating therewith to envelope said plurality of individal insulation blocks in an encapsulating panel. 4. The wind uplift resistant roofing structure of claim 3 further including one-way venting means in communication with a space below the membrane for exhausting air thereunder to atmosphere under wind uplift conditions. 5. The wind uplift resistant roofing structure of claim 4 wherein the one-way venting means comprises a base and a valve mounted therein, the base extending upwardly from the membrane and communicating with a space between the membrane and the insulating material. 6. The wind uplift resistant roofing structure of claim 4 wherein the one-way venting means comprises a plurality of one-way valves spaced apart from one another for exhausting air under the membrane to atmosphere, one of said valves being provided adjacent each corner of the deck. 7. The wind uplift resistant roofing structure of claim 1 or 4 wherein the deck includes roof edges subject to wind updraft along an underlying wall, and wherein the insulating material overlying the deck periphery adjacent said roof edges subject to wind updraft are enveloped by said sheet means. 8. The wind uplift resistant roofing structure of claim 3 or 4 wherein the membrane is fixed by spot bonding means to insulation blocks not enveloped by said sheet means to provide a partially adhered membrane. 9. The wind uplift resistant roofing structure of claim 1 or 4 including a gravel stop along at least a portion of the deck perimeter, and sealant between said gravel stop and weather resistant membrane along the deck perimeter providing a hermetic seal. 10. The wind uplift resistant roofing structure of claim 1 or 4 including a gutter along at least a portion of the deck perimeter, and sealant between the gutter and weather resistant membrane along the deck perimeter providing a hermetic seal. 11. The roofing structure of claim 1 or 4 including flashing along at least a portion of the deck perimeter, and sealant between said flashing and weather resistant membrane along the deck perimeter providing a hermetic seal. 12. The wind uplift resistant roofing structure of claim 1 wherein said individual insulation blocks are laid in a side-by-side abutting arrangement. 13. The wind uplift resistant structure of claim 1 wherein the encapsulating panels are each dimensioned and configured and disposed in a row along the outer edges of the roof structure to provide a uniform outer wind resistant configuration. 14. The wind uplift resistant roofing structure of claim 1 wherein the encapsulating panels cover at least portions of the deck periphery extending not more than about 20 feet inwardly from its perimeter.