Gaf - cobra 3 roof ridge exhaust vent in black - 18 sq. in. net-free area. 13-3/4 in. x 48 in. cut-out. plastic construction. black. - thd sku# 986754. A high vent probably won’t help with the shingle-curling problem. asphalt-shingle products are more strongly affected by ultraviolet radiation than by roof. For helpful videos and ridge vent installation instructions by roof type for qurrix ridge vents, ez-plugs & more, visit our installation resources page!.

For helpful videos and ridge vent installation instructions by roof type for qurrix ridge vents, ez-plugs & more, visit our installation resources page!.

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Gaf attic ventilation calculator. use this calculator to help determine the proper amount of attic ventilation based on u.s. fha 1/300 guidelines.. I have a 2/12 pitch shed roof that often forms an ice dam in winter. i'd like to both insulate and vent the roof. there is no soffit. over the roof-deck intake vents. The perma-boot 312 is a high performance vent the perma-boot 312 is a high performance vent pipe flashing designed for new roof and re-roof applications..