Drill a hole upward through the middle of the area you desire and leave the drill bit sticking up through the roof so you can find it from the outside.
How to install a roof vent on an existing roof.
First head up to your attic and determine where you want to install your roof vent.
Nail the section down by driving 2 inch roofing nails through the holes provided.
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.
Next position your ladder against your home and climb up to your roof.
Insert an end plug into a section of ridge venting and align the end with the end of the roof.
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This video is a comprehensive rundown on how to install a roof vent on a pre existing shingle roof.
5 add sections to.
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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Locate the drill bit.