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Old 06-20-2015, 11:19 AM   #1
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1980 20' Caravelle
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Coeur d alene , Idaho
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Sealant for Fantastic Vent ?

Not going to use the foam gasket provided with the fan. I am thinking about using Trempro 635 in place of the gasket and to seal screw heads and top of the flange. I see a 2010 thread on the subject---will Trempro 635 do the job or should use Sikaflex or something else? Love the Vent --have it hooked up just waiting to order the sealant. Thanks, Don
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Old 06-20-2015, 01:23 PM   #2
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1996 34' Excella
Elberta , Alabama
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I just installed two new Fantastics on our '96 34'er. I used the closed cell foam gaskets that came with them. Be advised the 14 x 14 holes in the ceiling of the AS should have a 2 x 2 frame between the inner ceiling panels and the roof panels. It will give you a lot more "meat" to screw the Fantastic frame to the roof than just the thickness of the aluminum.
Then to seal the frame to the roof, I used 3" wide Alumabond to cover the screw heads.
For whatever it's worth
Larry



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Originally Posted by glacierrunne View Post
Not going to use the foam gasket provided with the fan. I am thinking about using Trempro 635 in place of the gasket and to seal screw heads and top of the flange. I see a 2010 thread on the subject---will Trempro 635 do the job or should use Sikaflex or something else? Love the Vent --have it hooked up just waiting to order the sealant. Thanks, Don
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Old 06-20-2015, 05:31 PM   #3
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1971 21' Globetrotter
Arvada , Colorado
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I have installed a FF on my thread below that was done differently then any other on the forum. It's toward the end of the thread
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Old 06-20-2015, 06:45 PM   #4
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I set my fans with butyl tape, then sealant on the screw heads and edges of the flange.
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Old 06-21-2015, 11:52 AM   #5
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1996 25' Excella
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Sikaflex is absolutely permanent but it will be difficult to remove the installation if need be down the road. If you are using any tape or strip mastic be sure it is tight fitting all the way around and a little bit overlapped at the corners.

Good point about the support between he aluminum skins. I used Sikaflex to bed the new batwing antenna. The mounted antenna flexed quite a bit...wish I had the advice about the wood filler back then.
JCW
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Old 06-21-2015, 02:44 PM   #6
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2004 25' Safari
1968 17' Caravel
Fountain Valley , California
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About four years ago I had two of the Fantastic vent fans installed in my Airstream by Southwest Coaches in Irvine, CA. They used Sikaflex in their installations.
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Old 06-21-2015, 09:35 PM   #7
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1976 31' Sovereign
Portage , Indiana
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Took Lucille our '76 31'. LY on her maiden voyage. Lots of leaks. Interested in a good sealant. What type of roof are you using?. Mine is bad. Not looking to keep it the original. Any advice greatly appreciated! Jim Teach Lucille.
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Old 06-21-2015, 09:38 PM   #8
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1976 31' Sovereign
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Sorry what type roof vent are using?
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Old 06-21-2015, 10:29 PM   #9
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1980 20' Caravelle
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I have a Fantastic vent in place and is running as we speak. It is sitting on the provided plastic gasket with 8 screws holding it down. I am reading all the responses to this thread before I decide on the sealant to use. Thank-you to all you guys for your imput! Don
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Old 06-22-2015, 06:39 AM   #10
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1996 25' Excella
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Sikaflex! Second choice for me would be an industrial grade acrylic caulk... you want a non-curing caulk...no silicone. Silicone shrinks and pulls away especially if there is residue from the last install.
I like MONO brand but it may be available only in Canada. There are lots of good brands in the US. Go to Ace or someone in the construction supply business
JCW
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