Installing a roof vent - Fiberglass RV


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Old 09-16-2007, 09:00 AM   #1
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Trailer: 13 ft 1980 Boler
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I am installing a new roof vent on my 13 foot 1980 Boler. What is the best way to secure it to the roof? Rivets, stainless steel screws, small bolts and nuts. Also any other hints, such as how and what to seal it with would be helpful. Thank you. Don.
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Old 09-16-2007, 09:14 AM   #2
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Name: Roger
Trailer: Y2K6 Born Free 32RQ on the Kodiak chassis, 1995 Coachmen 19' B-van and 1996 Precision 21' Sailboat
Iowa
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Don, the one that's there is most likely secured with rivets. If it's been successful all these years, it's probably not unreasonable to use rivets again. Screws will work just as well, however. Use a good RV roof sealant... NOT silicone! You can get good roof sealant from your local RV store. I would suggest, however, that if you're going to the effort of replacing the vent, to replace it with a Fantastic Fan. They're really worth their weight in gold.

Roger
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Old 09-16-2007, 11:53 AM   #3
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Trailer: Boler (B1700RGH) 1979
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I really avoid screws into the fiberglass shell. If they are overtightened, they tear up the area around the hole. Most RV parts which are screwed in are assumed to be fastened to plywood, not a thin fiberglass shell.

Rivets will certainly work, although I don't like the process of removing them (if vent replacement or repair is required, in this case); a threaded fastener (bolt or screw) is easier to deal with in that respect.

For my MaxxFan vent, I wanted to attach a spacer on the inside; rivets would not have worked for that, although screws would have. Instead, I used small nuts and bolts.

One problem with nuts and bolts is that you normally need to reach both sides at the same time, which can be tough in many situations. In my case, the MaxxFan consists of a collar which installed first, with the fan dropped into it as a final step. It's easy to reach through the opening (stood up through the opening for the outside work), so there would be no problem in the MaxxFan case.

I actually used tee nuts embedded in the wooden spacer on the inside, but that would not be applicable to a normal vent installation - regular nuts would work.

I used stainless steel bolts, because I dislike dealing with rusted fasteners, and I wanted to be able to leave the head on the outside exposed. Stainless is not necessary.
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