How To Install Ridge Vent On Existing Roof

Roof vents come in a variety of styles and range from 10 to 500 each.

How to install ridge vent on existing roof.

Below we ve compiled some helpful tips on how to install a ridge vent for metal roofing. How to add a roof ridge vent to an existing roof. To calculate an example of exhaust and intake use 25 feet of roof ridge vent. Before the ridge vent installation begins the crew installs pieces of peel and stick membrane to patch under the existing felt paper on the adjacent wall.

Position a section of metal ridge cap over the peak of the metal roof with the end of the ridge cap flush with one end of the roof peak. Mark a pencil line on the ridges of the installed metal roofing panels using the edge of the ridge cap as a guide. Using the example above three round vents would be needed 432 144 3 vents or nine square vents 432 50 8 64 or 9 vents. Fasten the vent to the roof decking and rafters or trusses by nailing through the flange on both sides of the vent using the nails and nail spacing recommended by the manufacturer.

Then they lap the peel and stick existing felt and new housewrap over the step and kick out flashings so that any water hitting the wall is directed onto the roof instead of behind the flashing. Position the aluminum ridge vent along the reference line. One of the fundamental steps is to nail one side of the ridge vent before nailing the other sid. Ridge vents cost 2 to 3 per linear foot.

Add any connectors and end caps that came with your ridge vent system to ensure the vent is watertight. Exact rates depend on the type size and number of units you choose to install. Vents evenly spaced underneath the roof provide intake.