Remove all the shingle caps from the roof ridge from one side of the roof to the other by prying them up with a pry.
Installing roof ridge vent existing roof.
A shingle over vent is installed over the ridge of a roof and is covered over by asphalt shingle caps that match the surrounding roof shingles.
Snap a chalk line on either side of the ridge that is about an inch from the peak and cut the shingles along both.
An aluminum ridge vent has a mushroom shaped profile combined with a wide flange on both sides that sits on top of the roof shingles.
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This aluminum cap is the finished product and does not require additional asphalt shingle ridge caps.
A properly installed ridge vent increases energy efficiency and prolongs the life of your roof.
How to add a roof ridge vent to an existing roof 1.