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A radiant barrier rafter vent defining an elongate radiant heat reflective panel formed from a sheet of aluminum or other heat reflective material having longitudinal creases that permit compressing the panel a selected amount in a direction transverse to its length and panel strengthening spaced ap

A radiant barrier rafter vent defining an elongate radiant heat reflective panel formed from a sheet of aluminum or other heat reflective material having longitudinal creases that permit compressing the panel a selected amount in a direction transverse to its length and panel strengthening spaced apart formations on the remainder of the panel. The panel have a high reflectivity and are installable in various buildings between the rafters or roof supports spaced apart from the roof and optionally coated with a sound absorbing material or include small perforations therein.

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1. A radiant barrier panel spaced a selected distance downwardly from a lower face of a roof, said radiant barrier panel comprising an elongated heat reflective sheet of reflective material of selected thickness having at least one longitudinal creases formed on a selected opposing edge portions the

1. A radiant barrier panel spaced a selected distance downwardly from a lower face of a roof, said radiant barrier panel comprising an elongated heat reflective sheet of reflective material of selected thickness having at least one longitudinal creases formed on a selected opposing edge portions thereof permitting compressing the panel a selected amount in a direction transverse to said longitudinal creases and said radiant barrier panel including panel stiffening transverse major ribs spaced apart from one another at selected intervals on the panel including at least one stiff flexible longitudinal lateral support member disposed within said transverse major rib cooperatively engaging said longitudinal creases for cooperatively engaging and removably holding said sheet in a selected position disposed between and biased by and extending to a pair of roof support members comprising rafters. 2. The radiant barrier panel as defined in claim 1 wherein said creases are located proximate each of opposite longitudinal edges of the panel. 3. The radiant barrier panel as defined in claim 2 wherein said major rib extends transversely across the panel from one to the other of said creases at a position proximate each of opposite ends of the panel. 4. The radiant barrier panel as defined in claim 3 including a plurality of minor spaced apart ribs located between said major ribs and disposed between said longitudinal ceases. 5. The radiant barrier panel as defined in claim 1 in which a longitudinal terminal edge of the panel is folded over forming a curl stiffening ribs. 6. The radiant barrier panel as defined in claim 5 wherein a longitudinal terminal edge of said panel is rolled upon itself at least one turn comprising a rolled edge forming a strengthened outer tubular member defining a rod. 7. The radiant barrier panel as defined in claim 1 wherein said major ribs have a narrow groove in each of opposite ends thereof for cooperatively engaging said at least one stiff flexible longitudinal lateral support member. 8. The radiant barrier panel as defined in claim 7 wherein said flexible longitudinal lateral support member comprises a wire for each of said major ribs, said wire having opposite end portions thereof nested in the narrow grooves of the major rib associated therewith and piercing through the longitudinal creases. 9. The radiant barrier panel as defined in claim 1 wherein said longitudinal creases comprise accordion-like parallel pleated sections spaced apart from one another proximate respective opposite longitudinal marginal edges with said pleated sections. 10. A radiant barrier consisting essentially of an elongate radiant heat reflective panel, said panel comprising a sheet of reflective material of selected thickness having one or more longitudinal creases located proximate each of opposite longitudinal edges of the panel permitting compressing the panel a selected amount in a direction transverse to said longitudinal creases and panel stiffening formations spaced apart from one another on the remainder of the panel, said formations including a major rib disposed proximate at least each of opposite ends of the panel and extending transversely across the panel from one to the other of said longitudinal creases and a plurality of minor spaced apart stiffening formations located between said major ribs and said longitudinal creases and each opposing longitudinal edge of the panel is folded upon itself providing a stiffening rib and at least one stiff flexible longitudinal lateral support member disposed within said transverse major rib cooperatively engaging said longitudinal creases for cooperatively engaging and removably holding said sheet in a selected position disposed between and biased by and extending to a pair of roof support members comprising rafters. 11. The radiant barrier panel as defined in claim 10 said at least one stiff flexible longitudinal lateral support member cooperatively engaging and removably holding said sheet in a selected position disposed between a pair of roof support members spaced apart from a roof a selected distance is selected from the group consisting of a wire and a fiberglass rod. 12. The radiant barrier panel as defined in claim 10 wherein said major ribs have a narrow groove in each of opposite ends thereof. 13. The radiant barrier of claim 10, wherein said reflective material comprises a sheet of aluminum. 14. The radiant barrier panel as defined in claim 10 further comprising a least one flexible longitudinal lateral support member cooperatively engaging and removably holding said sheet in a selected position disposed between a pair of roof support members spaced apart from a roof a selected distance. 15. The radiant barrier panel of claim 10, wherein said plurality of minor spaced apart stiffening formations located between said major ribs and said longitudinal creases comprises a plurality of minor spaced apart ribs. 16. The radiant barrier panel as defined in claim 10 wherein a longitudinal terminal edge of said panel is rolled upon itself at least one turn comprising a rolled edge forming a strengthened outer tubular member defining a rod. 17. A radiant barrier comprising a heat reflective elongate panel insertable in friction fit between adjacently disposed spaced apart roof rafters, said panel having first and second laterally spaced apart longitudinally extending creased sections and panel strengthening formations disposed there between, said creased sections being disposed adjacent respective opposite longitudinal marginal edges of the panel permitting compressing the same a selected amount in a direction transverse to said longitudinally extending creased sections and wherein the panel longitudinal marginal edges are formed into panel strengthening ribs, said panel including transverse major ribs spaced apart from one another at selected intervals and at least one stiff flexible longitudinal lateral support member disposed within said transverse major rib cooperatively engaging said longitudinal creases for cooperatively engaging and removably holding said sheet in a selected position disposed between and biased by and extending to a pair of roof support members comprising rafters. 18. The radiant barrier panel of claim 17 wherein said reflective elongate panel comprises a sheet of aluminum. 19. The radiant barrier panel of claim 17, wherein said plurality of minor spaced apart stiffening formations located between said major ribs and said longitudinal creases comprises a plurality of minor spaced apart ribs. 20. The radiant barrier panel as defined in claim 17 wherein a longitudinal terminal edge of said panel is rolled upon itself at least one turn comprising a rolled edge forming a strengthened outer tubular member defining a rod.