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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.
â Cutting and Installing a Ridge Vent. To cut the opening for the ridge vent, they measure down 3 inches from the top of the ridge and snap a line. Using a circular saw with a carbide-tip blade, one of the roofers plunges the saw into the ridge at the ends and then follows the chalk line.