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 install ridge vent on existing roof.

Exact rates depend on the type size and number of units you choose to install. To calculate an example of exhaust and intake use 25 feet of roof ridge vent. Several ridge vent installation tips are given in this video. The amount of venting your attic needs is based on its floor space and to ensure proper air circulation the venting should be equally divided.

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. 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. One of the fundamental steps is to nail one side of the ridge vent before nailing the other sid. Add any connectors and end caps that came with your ridge vent system to ensure the vent is watertight.

Ridge vents cost 2 to 3 per linear foot. Position the aluminum ridge vent along the reference line. 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. Vents evenly spaced underneath the roof provide intake.

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. Mark a pencil line on the ridges of the installed metal roofing panels using the edge of the ridge cap as a guide. How to add a roof ridge vent to an existing roof.