How to seal roof vents properly - Fiberglass RV


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Old 05-30-2011, 10:40 PM   #1
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Name: Petra
Trailer: Big Foot camper
British Columbia
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How to seal roof vents properly

Hello everyone,
I tried to find the answer here, but ....not being very good with the pc.....I gave up
But I need help. The seal/caulking/whatever around our roof vent is cracking and it looks like it needs to be redone.
Do I have to remove all the old stuff?
What do I use to seal the roof vent???

Thanks for helping
Petra
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Old 05-30-2011, 11:08 PM   #2
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Name: Kirk
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I had the same question. I found this thread helpful. I'm going to use Stainless Steel fasteners as member Con suggests.

Butyl Tape, Silicone and sealing
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Old 05-31-2011, 04:40 PM   #3
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Name: Petra
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Thanks, that thread was very helpful.
I am still wondering though, if I have to remove all the old caulking down to the fiberglas or......????
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Old 05-31-2011, 05:06 PM   #4
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Yes.
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Old 05-31-2011, 09:37 PM   #5
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When I replaced our roof vent I cleaned all the old sealant and wiped the fiberglass w/ acetone to get a clean surface, then put a layer of butyl tape on the vent and screwed it in place w/ ss screws and washers and nuts inside, pulling the vent tight to the fiberglass body. Then I cleaned the squish out of putty and sealed over the top of the joint and over all the fasteners with Dicor lap sealant. No leaks and we have had a wet Oregon spring that certainly tested the seal.
Good luck!
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Old 06-02-2011, 02:54 PM   #6
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The old caulk should come off easily with a putty knife (or spatula) and a rag with Varsol or something similar. Rub it down to the bare gelcoat and you'll get a proper seal when new caulk is applied.
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