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Old 10-04-2012, 12:09 PM   #14
Beastly Adventurer
Joined: Sep 2010
Oddometer: 16,289
Originally Posted by vwboomer View Post
as I said, no eves so I can't go anywhere but roof. Which I spose I could do. little leery of what a 4" hole saw is gonna do to old fiberglass shingles. I guess with enough flashing and goop it shouldn't be a problem.

Make sure your hole saw is sharp and the shingles aren't cold and you should be OK. This is the roof vent I used:

which comes with its own flashing, so you just need to cut the shingles to fit and goop the seams. I didn't use the included duct, since I had 4" insulated duct already. In my case, since I had a package of shingles on hand, I went ahead and replaced all the shingles around the new opening. I did have to use a 5" hole saw so there would be room for the duct insulation and the clamps.
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