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A ridge ventilation system includes a plurality of ridge vent sections configured to be arranged end-to-end along the ridge of a roof covering a vent slot formed therealong. Each ridge vent section has an elongated longitudinally flexible top panel with a central portion, edge portions terminating a

A ridge ventilation system includes a plurality of ridge vent sections configured to be arranged end-to-end along the ridge of a roof covering a vent slot formed therealong. Each ridge vent section has an elongated longitudinally flexible top panel with a central portion, edge portions terminating at extreme edges of the top panel, and ventilation grids extending beneath and along the edge portions spaced from extreme edges thereof. The space between the extreme edges of the top panel and the ventilation grids forms or defines an overhang configured to receive edges of shingles in a course of shingles installed next to the vent section and to inhibit the edges of the shingles from rising up. The ridge vent sections also have depending deflectors for deflecting blowing rain and snow that might enter through the ventilation grids and filter fabric may be affixed to the bottom of the ridge vent sections to provide additional deflection of rain and snow. The ridge ventilation system is particularly useful with slate or slate-style roofs and the vent sections are sized so that ridge cap slates extend beyond the extreme edges of the sections to hide substantially the ridge ventilation system from view.

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1. A ridge vent section suitable for slate shingled roofs, the ridge vent comprising: an elongated laterally flexible top panel having an upper side, a lower side, a central portion, and edge portions terminating at extreme edges of the top panel;ventilation grids depending from the lower side of th

1. A ridge vent section suitable for slate shingled roofs, the ridge vent comprising: an elongated laterally flexible top panel having an upper side, a lower side, a central portion, and edge portions terminating at extreme edges of the top panel;ventilation grids depending from the lower side of the top panel with each ventilation grid extending along a respective edge portion of the laterally flexible top panel spaced from the extreme edge thereof;the edge portions of the top panel defining an overhang between the ventilation grids and an extreme edge of the edge portions;an array of longitudinally spaced apart support baffles each depending from the lower side of laterally flexible top panel and extending laterally beneath the overhang from the ventilation grids to an extreme edge of the edge portions, the baffles being arched from a lower edge of each ventilation grid toward an extreme edge of the edge portion of the top panel to form a series of spaced apart hold-downs for a row of field shingles installed beside the ridge vent; andthe top panel being sized to be substantially hidden beneath ridge cap shingles installed atop the ridge vent when the ridge vent is applied along the ridge of a roof. 2. A ridge vent section as claimed in claim 1 and further comprising at least one line of relative weakness formed along the central portion of the top panel. 3. A ridge vent section as claimed in claim 2 and wherein two spaced apart lines of relative weakness are formed along the central portion of the top panel. 4. A ridge vent section as claimed in claim 3 and wherein the lines of relative weakness comprise lines of indentation formed in the central portion of the top panel. 5. A ridge vent section as claimed in claim 4 and wherein the lines of indentation are formed on the lower side of the top panel. 6. A ridge vent section as claimed in claim 1 and wherein the ventilation grids depend downwardly at an angle relative to the lower side of the top panel. 7. A ridge vent section as claimed in claim 6 and wherein the ventilation grids extend downwardly from the lower side of the top panel and outwardly relative to the central portion of the top panel. 8. A ridge vent section as claimed in claim 1 and further comprising deflectors depending from the lower side of the top panel and being arranged to intercept and deflect blowing rain and snow that may enter through the ventilation grids. 9. A ridge vent section as claimed in claim 8 and wherein the deflectors are spaced apart in the lateral direction and staggered with respect to one another. 10. A ridge vent section as claimed in claim 9 and wherein the deflectors are sized such that they partially overlap one another in the lateral direction to present a substantially continuous barrier. 11. A ridge vent section as claimed in claim 8 and wherein the deflectors are substantially rectangular in cross section. 12. A ridge vent section as claimed in claim 8 and wherein the deflectors are substantially curved in cross section to define a concave surface facing the ventilation grids. 13. A ridge vent section as claimed in claim 8 and wherein the deflectors taper from a wider portion at the top panel to a narrower portion at free ends of the deflectors. 14. A ridge vent section as claimed in claim 13 and wherein the deflectors are further curved to present a concave surface toward the ventilation grids. 15. A ridge vent section as claimed in claim 1 and wherein the ventilation grids have insides facing the central portion of the top panel and wherein the support baffles also extend toward the central portion of the top panel on the insides of the ventilation grids. 16. A ridge vent section as claimed in claim 15 and further comprising a slot formed in the support baffles on the insides of the ventilation grids, the slots of the support baffles being substantially aligned in the longitudinal direction of the ridge vent section. 17. A ridge vent section as claimed in claim 16 and further comprising filter fabric fixed to the underside of the ridge vent section, at least a portion of the filter fabric extending into the slots of the support baffles to form a double wall of filter fabric to inhibit ingress of rain and snow. 18. A ridge vent section as claimed in claim 17 and wherein the filter fabric is heat staked to the ridge vent section. 19. A ridge vent section as claimed in claim 17 and wherein the filter fabric is draped over internal ends of the support baffles to form another wall of filter fabric to inhibit ingress of rain and snow. 20. A roof comprising: a roof deck;a roof ridge;a vent slot formed along the roof ridge;a plurality of vent sections as claimed in claim 1 arranged end-to-end covering the vent slot;courses of field shingles covering the roof deck, the shingles of the uppermost course of field shingles having upper edges disposed beneath the hold-downs formed by the arched ends of the support baffles; andridge cap shingles covering the ridge vent sections. 21. The roof of claim 20 and wherein the ridge cap shingles extend beyond the extreme edges of the ridge vent. 22. The roof of claim 20 and wherein the shingles are slate-style shingles. 23. The roof of claim 20 and wherein the shingles are slate shingles. 24. A ridge ventilation system comprising a plurality of ridge vent sections configured to be arranged end-to-end along the ridge of a roof covering a vent slot formed therealong, each ridge vent section having an elongated laterally flexible top panel with a central portion, edge portions terminating at extreme edges of the top panel, and ventilation grids fixed to the top panel along a line spaced from an extreme edge of the top panel and extending downwardly and laterally outwardly therefrom, the space between the extreme edges of the top panel and the ventilation grids forming an overhang configured to receive edges of shingles in a course of shingles installed next to the vent section and to inhibit the edges of the shingles from rising up. 25. The ridge ventilation system of claim 24 and wherein the ventilation grids are angled downwardly and outwardly from the top panel to preserve a net free area of the ventilation grids when edges of shingles are disposed beneath the overhang. 26. The ridge ventilation system of claim 24 and wherein the top panels of the ridge vent sections are sized to receive ridge cap shingles with the ridge cap shingles projecting beyond the extreme edges of the top panel for substantially hiding the ridge ventilation system. 27. The ridge ventilation system of claim 24 and further comprising deflectors positioned to intercept and deflect rain and snow that might enter the ridge vent sections through their ventilation grids. 28. The ridge ventilation system of claim 27 and wherein the deflectors depend from the top panel on an interior side of the ventilation grids and are positioned to present a substantially continuous barrier toward the ventilation grids and are spaced in the lateral direction to permit airflow past the deflectors.