The lower half of the flange sits on top of the shingles.
How to install a roof fan vent.
Before you begin make sure all factory installed bolts are tightened.
Afterward install the roof vent fan flange as you normally would.
Then cover the bottom of the adaptor with 3m marine sealant and clamp it to the roof until dry.
Mount the vent as close to the center of the house as possible.
Draw a circle on the roof matching the diameter of your fan.
Afterward install the vent fan flange as you normally would.
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To install a roof adaptor cut and clean the hole in the roof as you would normally.
Consider two things for maximum performance when you choose the location of the vent.
The pilot hole you drilled should be in the center of the circle.
So there you have it.
Plenty more videos t.
Mount it as near to the roof ridge without it being visible from the front of the house.
Nail the lower corners with roofing nails and tar the heads.
To install a roof adaptor cut and clean the hole in the roof as you would normally.
Slide the vent under the shingles so they cover the top half of the vent flange.
Then cover the bottom of the adaptor with 3m marine sealant and clamp it to the roof until dry.
Then get on the roof and draw the circle around the pilot hole with a piece of chalk.
Apply a bead of asphalt roof cement on the bottom of the vent.