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A vapor barrier for sealing an interior of a building from an insulation cavity defined by framing members of the building includes a flexible and substantially impermeable sheet having apertures to allow air to exit the insulation cavity during filling of the insulation cavity with loose fill insul

A vapor barrier for sealing an interior of a building from an insulation cavity defined by framing members of the building includes a flexible and substantially impermeable sheet having apertures to allow air to exit the insulation cavity during filling of the insulation cavity with loose fill insulation. The vapor barrier also includes one-way valves mounted across the apertures. The valves are configured to allow air flow out of the insulation cavity and into the building interior through the apertures and to prevent air flow and moisture diffusion from the building interior into the insulation cavity.

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1. A vapor barrier for sealing an interior of a building from an insulation cavity defined by structural members of the building, the vapor barrier comprising: a flexible and substantially impermeable sheet having apertures to allow air to exit the insulation cavity during filling of the insulation

1. A vapor barrier for sealing an interior of a building from an insulation cavity defined by structural members of the building, the vapor barrier comprising: a flexible and substantially impermeable sheet having apertures to allow air to exit the insulation cavity during filling of the insulation cavity with loose fill insulation; andone-way valves mounted across the apertures, the valves configured to allow air flow out of the insulation cavity and into the building interior through the apertures and to substantially prevent air flow from the building interior into the insulation cavity, wherein the flapper valves have the structure of flexible and frameless valve sheets configured to extend from a respective base end fixed to the impermeable sheet to a respective distal end, wherein the valve sheets are movable between a first position and a second position, wherein in a first position, the base ends and the distal ends of the valve sheets overlap portions of the impermeable sheet and are in contact with the impermeable sheet, and in a second position, the distal ends of the valve sheets are spaced from the impermeable sheet. 2. The vapor barrier of claim 1 in which the one-way valves are flapper valves. 3. The vapor barrier of claim 1 in which the distal end is statically charged such that the distal end and the sheet are drawn together to seal the aperture. 4. The vapor barrier of claim 2 in which the flapper valves and the sheet are formed from different materials. 5. The vapor barrier of claim 4 in which the flapper valves are formed from nylon. 6. The vapor barrier of claim 1 in which the valves have a water vapor diffusion resistance that varies in relation to ambient humidity. 7. The vapor barrier of claim 1 in which the sheet has a water vapor diffusion resistance that varies in relation to ambient humidity. 8. The vapor barrier of claim 1 further comprising: filters mounted on the sheet and extending across the apertures. 9. The vapor barrier of claim 8 in which the filters and the one-way valves are mounted to the sheet on opposite sides relative to one another. 10. The vapor barrier of claim 8 in which the filters and the one-way valves are mounted to the same side of the sheet. 11. The vapor barrier of claim 8 in which the filters are integral with one another. 12. The vapor barrier of claim 11 in which the apertures are arranged in a row and the filters are defined by a single strip or a plurality of strips extending a length of the row. 13. The vapor barrier of claim 10 in which the filters and the one-way valves are connected together. 14. The vapor barrier of claim 1 in which the apertures are configured to allow insertion of a nozzle for injecting loose fill insulation into the insulation cavity. 15. A vapor barrier for sealing an interior of a building from an insulation cavity defined by structural members of the building, the vapor barrier comprising: a flexible and substantially impermeable sheet having apertures to allow air to exit the insulation cavity during filling of the insulation cavity with loose fill insulation; andone-way valves mounted across the apertures, the valves configured to allow air flow out of the insulation cavity and into the building interior through the apertures and to substantially prevent air flow from the building interior into the insulation cavity, wherein the one-way valves are movable between a first position and a second position, wherein in a first position, the base ends and the distal ends of the one-way valves overlap portions of the impermeable sheet and are in contact with the impermeable sheet, and in a second position, the distal ends of the one-way valves are moveable between a first position in contact with the impermeable sheet and a second position spaced from the impermeable sheet; andwherein in the second position, the one-way valves are configured to lay flat against the sheet such as not to interfere with subsequently applied drywall.