This video is a comprehensive rundown on how to install a roof vent on a pre existing shingle roof.
How to install a roof vent on an existing roof.
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.
Insert an end plug into a section of ridge venting and align the end with the end of the roof.
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First head up to your attic and determine where you want to install your roof vent.
5 add sections to.
The installation of a turbine vent is nearly identical to a static vent.
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.
Nail the section down by driving 2 inch roofing nails through the holes provided.
A roofer will from the attic mark a spot near the ridge of the roof he may first use nails from the attic to mark preferred spots between two rafters.
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Take your time and do not use a straight blade use a hook blade you can get it at home of the deep.
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