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To install a 50-foot long ridge vent, a roofing contractor will charge $409, which includes the labor and material. If you're a handy homeowner who has experience working on roofing projects, you can buy the ridge vent material for $125 and install it yourself, saving 69 percent, a nice reward for your work.
Preparing for Ridge Vent Installation. For a ridge vent to work properly, it must have adequate intake of fresh, cool air. As the ridge vent expels hot, humid air, intake vents feed fresh, cool air into the attic. Equal flow of exhaust and intake should be provided. Example: 900-square-foot attic / 150 square feet = 6 square feet of net-free area.