For most asphalt shingle ridge caps there are two.
How to install ridge vent on existing roof.
Install new field shingles.
Start by removing the nails holding the ridge cap shingles in place.
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Cut the ventilation opening.
Remove the shingle caps.
Install the ridge vent shingle over style install the ridge vent aluminum.
A ridge vent is an important part of a home s roofing system.
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.
Installed at the peak of a sloped roof the ridge vent allows damp warm air to escape from the attic.
Installing the vent in an existing roof entails tearing off the ridge shingles and cutting away the upper 2 or 3 inches of roof sheathing on each side of the ridge with a circular saw.