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One aspect of the invention relates to an insulation and ventilation system for a building envelope (e.g. a building wall and/or a building roof). The system includes: one or more interior building envelope layers; an insulation panel having an interior side abutting against at least one of the one

One aspect of the invention relates to an insulation and ventilation system for a building envelope (e.g. a building wall and/or a building roof). The system includes: one or more interior building envelope layers; an insulation panel having an interior side abutting against at least one of the one or more interior building envelope layers and an exterior side having a plurality of transversely spaced and continuously longitudinally extending grooves interspaced between a plurality of transversely spaced and continuously longitudinally extending protrusions; and one or more exterior building envelope layers located exterior to the insulation panel to provide a plurality of transversely localized venting channels defined at least in part by an interior surface of the one or more exterior building envelope layers and the grooves of the exterior side of the insulation panel.

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1. An insulation system for a building envelope, the system comprising: one or more first building envelope layers;an insulation panel having a first side abutting against at least one of the one or more first building envelope layers and a second side having a plurality of transversely spaced and c

1. An insulation system for a building envelope, the system comprising: one or more first building envelope layers;an insulation panel having a first side abutting against at least one of the one or more first building envelope layers and a second side having a plurality of transversely spaced and continuously longitudinally extending grooves interspaced between a plurality of transversely spaced and continuously longitudinally extending protrusions, the continual longitudinal extension of the grooves and protrusions orthogonal to the transverse spacing of the grooves and protrusions;one or more second building envelope layers located adjacent to the insulation panel; anda plurality of channels defined at least in part by a surface of the one or more second building envelope layers and the grooves of the second side of the insulation panel;wherein the continual longitudinal extension of the grooves and protrusions extends continuously along an entire longitudinal dimension of the panel to thereby provide the plurality of channels with corresponding longitudinal extension along the entire longitudinal dimension of the panel;wherein the longitudinal extension of the grooves and protrusions is oriented at least partially vertically for gravity-based drainage of moisture through the channels;wherein the insulation panel comprises a rigid foam insulation panel; andwherein the rigid foam insulation panel comprises a vapor-impermeable panel. 2. An insulation system according to claim 1 wherein there is no fluid path from the second side to the first side of the insulation panel. 3. An insulation system according to claim 1 wherein the first side of the insulation panel is generally planar. 4. An insulation system according to claim 1 wherein the insulation panel has a thickness, defined as the distance between the first side and the second side, which varies due to the protrusions and the grooves. 5. An insulation system according to claim 1 wherein at least one of the one or more second building envelope layers is mounted to at least one of the one or more first building envelope layers by fasteners which project through the at least one of the one or more second building envelope layers and through the insulation panel and into the at least one of the one or more first building envelope layers. 6. An insulation system according to claim 1 wherein a cross-sectional perimeter of one or more of the channels is completely defined by the surface of the one or more second building envelope layers and the grooves of the second side of the insulation panel. 7. An insulation system according to claim 1 wherein the system comprises a plurality of longitudinally adjacent insulation panels aligned with each other such that the continuously longitudinally extending grooves extend across the longitudinally adjacent insulation panels. 8. An insulation system according to claim 1 wherein the plurality of grooves are evenly transversely spaced from one another. 9. An insulation system according to claim 1 wherein in at least a portion of the insulation panel, a ratio of a transverse width of one of the longitudinally extending grooves to a transverse width of an adjacent one of the longitudinally extending protrusions is greater than or equal to 3:1. 10. An insulation system according to claim 1 wherein the grooves have a generally rectangular-shaped cross-section. 11. An insulation system according to claim 1 wherein the grooves have beveled sidewalls to provide a trapezoidal-shaped cross-section. 12. An insulation system according to claim 1 wherein the first side of the insulation panel comprises an adhesive in the shape of spaced apart vertical columns for mounting the insulation panel to the at least one of the one or more first building envelope layers. 13. A kit for assembling an insulation system for a building envelope having one or more first building envelope layers and one or more second building envelope layers, the kit comprising: a rigid foam insulation panel having a first side shaped for abutting against at least one of the one or more first building envelope layers and a second side having a plurality of transversely spaced and continuously longitudinally extending grooves interspaced between a plurality of transversely spaced and continuously longitudinally extending protrusions, the continual longitudinal extension of the grooves and protrusions orthogonal to the transverse spacing of the grooves and protrusions and the panel shaped for fitting on a first side of the one or more second building envelope layers to provide a plurality of channels defined at least in part by a surface of the first side of the one or more second building envelope layers and the grooves of the second side of the insulation panel;wherein the continual longitudinal extension of the grooves and protrusions extends continuously along an entire longitudinal dimension of the panel to thereby provide the plurality of channels with corresponding longitudinal extension along the entire longitudinal dimension of the panel;wherein the grooves have a substantially rectangular transverse cross-section along their entire longitudinal extension; andwherein the rigid foam insulation panel comprises a vapor-impermeable panel. 14. A kit according to claim 13 wherein a ratio of a sum of transverse widths of the longitudinally extending grooves of the insulation panel to a sum of transverse widths of the longitudinally extending protrusions of the insulation panel is greater than or equal to 3:1. 15. A kit according to claim 13 wherein a cross-sectional perimeter of one or more of the channels is completely defined by the surface of the first side of the one or more second building envelope layers and the grooves of the second side of the insulation panel. 16. A method for providing insulation in a building envelope, the method comprising: providing a rigid foam insulation panel having a first side and a second side having a plurality of transversely spaced and continuously longitudinally extending grooves interspaced between a plurality of transversely spaced and continuously longitudinally extending protrusions, the continual longitudinal extension of the grooves and protrusions orthogonal to the transverse spacing of the grooves and protrusions, wherein the rigid foam insulation panel comprises a vapor-impermeable panel;abutting the first side of the insulation panel against a first surface of one or more first building envelope layers; andmounting one or more second building envelope layers at locations adjacent the second side of the insulation panel to thereby provide a plurality of channels defined at least in part by a second surface of the one or more second building envelope layers and the grooves of the second side of the insulation panel;wherein the continual longitudinal extension of the grooves and protrusions extends continuously along an entire longitudinal dimension of the panel to thereby provide the plurality of channels with corresponding longitudinal extension along the entire longitudinal dimension of the panel; andorienting the longitudinal extension of the grooves and protrusions at least partially vertically for gravity-based drainage of moisture through the channels. 17. A method according to claim 16 wherein a ratio of a sum of transverse widths of the longitudinally extending grooves of the insulation panel to a sum of transverse widths of the longitudinally extending protrusions of the insulation panel is greater than or equal to 3:1. 18. A method according to claim 16 wherein a cross-sectional perimeter of one or more of the channels is completely defined by the second surface of the one or more second building envelope layers and the grooves of the second side of the insulation panel. 19. A kit according to claim 13 comprising a plurality of insulation panels shaped for longitudinally adjacent and longitudinally aligned mounting with each other such that the continuously longitudinally extending grooves extend across the longitudinally adjacent insulation panels. 20. An insulation panel comprising: a rigid foam insulation panel comprising a first side and a second side;the second side having a plurality of transversely spaced and continuously longitudinally extending grooves interspaced between a plurality of transversely spaced and continuously longitudinally extending protrusions, the continual longitudinal extension of the grooves and protrusions orthogonal to the transverse spacing of the grooves and protrusions;wherein the continual longitudinal extension of the grooves and protrusions extends continuously along an entire longitudinal dimension of the panel; andwherein the grooves have a substantially rectangular transverse cross-section along their entire longitudinal extension;wherein the rigid foam insulation panel comprises a vapor-impermeable panel. 21. An insulation panel according to claim 20 wherein there is no fluid path from the first side to the second side of the insulation panel. 22. An insulation system according to claim 1 wherein a depth of the grooves is greater than ¼ inch over at least 75% of a surface area of the abutting contact between the first side of the panel and the one or more first building layers.