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Replacing a Roof Vent

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  • May 4th, 2020 7:05 pm
Deal Fanatic
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Jan 22, 2008
6622 posts

Replacing a Roof Vent

I have a powered vent fan on my roof that is dead. I am wanting to replace it with a Ventilation Maximum 301-12 passive vent. The hole in the roof once the powered fan is removed is about 16.5" and round-ish The passive vent only needs a 12"x12" square hole and has 19.5" diameter flashing so I'm only covering the hole with an extra 3" (1.5" on either side) which I'm pretty sure is not safe. Is it possible to add on to the flashing to get extra coverage?
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2 replies
Deal Fanatic
Dec 5, 2009
5766 posts
Can you not replace the wood in that section and reapply shingles ? Maybe a couple of feet wide.
Deal Addict
Oct 22, 2016
1025 posts
Comox Valley
As fdl says, replace the wood in that section. Or depending how old you roof is, and if it might have to be redone in 5 years, just do a temporary fix to it.
Such as, add extra support to this area from attic space, if you have enough head room.


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