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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.
Ridge vent. 1  The idea behind roof ventilation is to get fresh air circulating to the underside of the deck. 2  Industry standard is that for every 150 square feet of attic floor area, you need 1 square foot of intake ventilation and 1 square foot of exhaust ventilation.