Hip and ridge vent

1. A roof ridge and hip ridge vent system for contoured roofs, comprising:

a vent slot located through a roof structure along at least one of a roof ridge or hip ridge, the roof ridge having a ridge length and the hip ridge having a hip length, the vent slot defining a first side of the roof structure and a second side of the roof structure;

a contoured roofing material having upwardly directed projections that forms a roof surface;

a first vent strip located on the roof surface on the first side of the roof structure extending along the vent slot for the ridge length or the hip length, and a second vent strip located on the roof surface on the second side of the roof surface and extending along the vent slot for the ridge length or the hip length, the first and second vent strips having respective top and bottom surfaces and comprising synthetic fibers that are randomly aligned into an open web by an air flow and then joined by a phenolic or latex binder that is heat cured to form an air permeable mesh material having a generally uniform thickness, a density of about 0.08 to 0.1 grams per cubic centimeter (1.3 to 1.6 grams per cubic inch), and a crush recovery of at least 80%, each of the first and second vent strips comprising a respective first longitudinally extending groove, arranged parallel to the roof ridge or hip ridge, extending for the roof length or the hip length and from the respective bottom surface to about 40% to 60% of a height of the respective vent strip in an uninstalled state, the respective first longitudinally extending groove being located a distance of at least about 1 inch from a downslope side of the respective vent strip, each of the first and second vent strips resiliently compressible such that a space between the respective projections in the contoured roofing material is filled with the respective vent strip, and a portion of the respective strip is compressed into contact with and extends over the respective projections, with some of the fibers being moved or compressed into the respective first longitudinally extending groove in an area of the respective projections; and

a cap overlying the slot and the first and second vent strips.

2. The roof ridge and hip ridge vent system for contoured roofs of claim 1 , wherein a height of each of the first and second vent strips is in a range of 1 to 1.5 inches.

3. The roof ridge and hip ridge vent system for contoured roofs of claim 1 , wherein each first longitudinally extending groove has a groove width that is at least about 0.12 inches to about 0.25 inches.

4. The roof ridge and hip ridge vent system for contoured roofs of claim 1 , wherein each first longitudinally extending groove extends from the respective bottom surface about 50% of the height of the respective vent strip.

5. The roof ridge and hip ridge vent system for contoured roofs of claim 1 , wherein each of the first and second vent strips comprise a respective second longitudinally extending groove extending from the respective bottom surface of the respective vent strip and is spaced upslope from and apart a nominal distance S from the respective first longitudinally extending groove, and S is at least about 1 inch.

6. The roof ridge and hip ridge vent system for contoured roofs of claim 5 , wherein the first and second vent strips with the respective first and second longitudinally extending grooves are adapted for roofs having a roof pitch of less than 5/12.