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A ventilated exterior wall or roof system comprises frame including a plurality of frame members, and a double envelope structure attached to the exterior of the frame. The double envelope structure comprises a water resistant membrane, an exterior sheathing material disposed on the exterior side of

A ventilated exterior wall or roof system comprises frame including a plurality of frame members, and a double envelope structure attached to the exterior of the frame. The double envelope structure comprises a water resistant membrane, an exterior sheathing material disposed on the exterior side of and spaced from the water resistant membrane, and one or more air channels between the water resistant membrane and the exterior sheathing.

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1. A ventilated exterior wall or roof system comprising: a frame including a plurality of frame members;a water resistant membrane applied directly to an exterior side of the frame;an exterior sheathing spaced from an exterior side of said water resistant membrane; andone or more air channels betwee

1. A ventilated exterior wall or roof system comprising: a frame including a plurality of frame members;a water resistant membrane applied directly to an exterior side of the frame;an exterior sheathing spaced from an exterior side of said water resistant membrane; andone or more air channels between said water resistant membrane and said exterior sheathing. 2. The ventilated exterior wall or roof system of claim 1 wherein said water resistant membrane comprises a breathable membrane that passes water vapor while preventing passage of bulk water. 3. The ventilated exterior wall or roof system of claim 1 further comprising a finish siding applied to an exterior side of said exterior sheathing. 4. The ventilated exterior wall or roof system of claim 3 wherein said finish siding comprises one of horizontal siding, shingles, brick, stone, or stucco. 5. The ventilated exterior wall or roof system of claim 3 further comprising a second water resistant membrane between said exterior sheathing and said finish siding. 6. The ventilated exterior wall or roof system of claim 1 further comprising a roofing material applied to an exterior side of said exterior sheathing. 7. The ventilated exterior wall or roof system of claim 6 wherein said roofing material comprises one of a metal roofing, or shingles. 8. The ventilated exterior wall or roof system of claim 6 further comprising a second water resistant membrane between said exterior sheathing and said roofing material. 9. A ventilated exterior wall or roof system comprising: a frame including a plurality of frame members;a water-resistant membrane secured directly to an exterior side of said frame;an exterior sheathing disposed on an exterior side of said water resistant membrane;a plurality of spacers between said water-resistant membrane and said exterior sheathing to space said exterior sheathing material from said water-resistant membrane; andone or more air channel between said water-resistant membrane and said exterior sheathing. 10. The ventilated exterior wall or roof system of claim 9 wherein said water resistant membrane comprises a breathable membrane that passes water vapor while preventing passage of bulk water. 11. The ventilated exterior wall or roof system of claim 9 further comprising a finish siding applied to an exterior side of said exterior sheathing. 12. The ventilated exterior wall or roof system of claim 11 wherein said finish siding comprises one of horizontal siding, shingles, brick, stone, or stucco. 13. The ventilated exterior wall or roof system of claim 11 further comprising a second water resistant membrane between said exterior sheathing and said finish siding. 14. The ventilated exterior wall or roof system of claim 9 further comprising a roofing material applied to an exterior side of said exterior sheathing. 15. The ventilated exterior wall or roof system of claim 14 wherein said roofing material comprises one of a metal roofing, or shingles. 16. The ventilated exterior wall or roof system of claim 14 further comprising a second water resistant membrane between said exterior sheathing and said roofing material. 17. A method of constructing an exterior wall or roof system, said method comprising: building a frame comprising one or more frame members;applying a water-resistant membrane directly to said frame;arranging an exterior sheathing in spaced relationship to said water-resistant membrane to define one or more air channels between said water-resistant membrane and said exterior sheathing, said exterior sheathing being disposed on an exterior side of said water-resistant membrane. 18. The method of claim 17 wherein said water resistant membrane comprises a breathable membrane that passes water vapor while preventing passage of bulk water. 19. The method of claim 17 further comprising applying a finish siding to an exterior side of said exterior sheathing. 20. The method of claim 19 wherein said finish siding comprises one of horizontal siding, shingles, brick, stone, or stucco. 21. The method of claim 19 further comprising a second water resistant membrane between said exterior sheathing and said finish siding. 22. The method of claim 17 further comprising applying a roofing material to an exterior side of said exterior sheathing. 23. The method of claim 22 wherein said roofing material comprises one of a metal roofing, or shingles.