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A ridge peak roof ventilator comprising a pair of vent parts disposed on opposing sides of an opening in a roof peak, and a top panel disposed above and connecting each of the vent parts. The vent parts may be of unitary construction, folded from interconnected panels, or assembled from individual l

A ridge peak roof ventilator comprising a pair of vent parts disposed on opposing sides of an opening in a roof peak, and a top panel disposed above and connecting each of the vent parts. The vent parts may be of unitary construction, folded from interconnected panels, or assembled from individual layers of sheet material, and each forms a multiplicity of air passages through which air flows from the interior to the exterior of the roof ventilator. The top panel is constructed from double-faced corrugated plastic having a pair of planar plies and a convoluted intermediate ply. The underside of the top panel is routed along the centerline to form a concave recessed area, thereby cutting away a section of one planar ply and part of the intermediate ply to form oval-shaped openings. Each opening has side walls traversing concave arcuate paths between a maximum height adjacent the side edges of the .[.recesesd.]. .Iadd.recessed .Iaddend.area and a minimum height along the centerline. The top panel will responsively fold along the centerline corresponding to the minimum heights of each of the side walls. Each vent part defines pockets serving as precipitation barriers, the pockets being formed by cutting an array of apertures into separate panels and folding or attaching those panels in parallel abutting contact with the apertures aligned. The top panel may also define one or more lines of apertures extending completely therethrough. The roof ventilator may be shipped flat or folded into a compact bundle.

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[ What is claimed is:] [16.]16. In a roof ventilator for mounting on a peak of a roof having a roof opening, said roof ventilator having a pair of vent parts disposed on opposing sides of said roof opening and a top panel disposed above said pair of vent parts, said top panel being constructed of a

[ What is claimed is:] [16.]16. In a roof ventilator for mounting on a peak of a roof having a roof opening, said roof ventilator having a pair of vent parts disposed on opposing sides of said roof opening and a top panel disposed above said pair of vent parts, said top panel being constructed of a double-faced corrugated sheet material having a pair of planar plies spaced apart a distance and an intermediate ply, said intermediate ply having a multiplicity of convolutions and being disposed between and connected to each of said pair of planar plies to define a longitudinal grain and a multiplicity of partially enclosed air passages extending therethrough parallel with said longitudinal grain, said roof ventilator defining an interior region and an exterior region surrounding said roof ventilator, said top panel having an underside defined by a one of the pair of planar plies communicating with and proximate to said interior region, the improvement comprising:a generally concave recessed area cut in and extending at least partially into the underside of the top panel, said generally concave recessed area extending through the one of the pair of planar plies defining the underside of the top panel and at least partially through the intermediate ply, said generally concave recessed area having a pair of side edges and a centerline disposed approximately equidistant between said pair of side edges, said generally concave recessed area defining a plurality of openings, each of said plurality of openings having a pair of side walls defined by the intermediate ply, said pair of side walls each traversing a generally oval-shaped path and having a side wall margin, said margin defining at least a portion of said generally concave recessed area such that the top panel may be manually folded within said generally concave recessed area..Iaddend..Iadd.