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Old 07-18-2010, 12:04 PM   #1
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Fantastic Fan Gasket Use?

Have the vent holes squared an am ready to install 1st fan. What's the consensus on how to seal the flange to the roof? Gasket provided by FF, Vulkem or another sealant/caulk or a combo of the two?
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Old 07-18-2010, 12:35 PM   #2
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I have installed 2 in our AS and yes I did use the gasket provided. I spoke with the distributor and the company and they feel this is the best way to go.
The distributor, who has installed hundreds of fans also recommended Dicor Lap sealant (501 LSW) so that is what I used and it has turned out great.
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Old 07-18-2010, 12:41 PM   #3
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I have installed 2 in our AS and yes I did use the gasket provided. I spoke with the distributor and the company and they feel this is the best way to go.
The distributor, who has installed hundreds of fans also recommended Dicor Lap sealant (501 LSW) so that is what I used and it has turned out great.
NashBuff,

Exactly where did you apply the sealant? Thanks
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Old 07-18-2010, 12:49 PM   #4
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I used the sealant on the gasket itself and then once in place sealed all around and each screw. I used about a tube for each fan.
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Old 07-18-2010, 01:43 PM   #5
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When installing a Fantastic Fan using the included gasket, you don't need to seal the gasket.

After you screw the plastic flange to the roof (with the gasket under it, of course ), you then run a bead of Dicor or Sikaflex 715 which are both self-levelling sealants ( which I prefer) around the seam between the flange and the roof, then another around the flange on top of that bead you just applied. As I work around, I run a continuous bead around and on top of each screw head as well.

This way, you have all of the openings to the roof and interior well sealed.I have found that Dicor tends to crack and weather in 2-3 years, where Sikaflex will not crack at all.............just an observation.
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Old 07-18-2010, 02:55 PM   #6
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Lew I found a mobile tech to fix my fridge, thanks for the idea.
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Old 07-19-2010, 10:59 AM   #7
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Can't find Sikaflex 915

I can't find any Sikaflex 915 in this area and since the Dicor cracks in 2-3 years would like something better. Any other suggestions for sealants? I have Vulkem 116, Trempro 636 and Parbond. I can get Sikaflex 215 and 221 locally, but can't get the 915.
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Old 07-19-2010, 01:22 PM   #8
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I can't find any Sikaflex 915 in this area and since the Dicor cracks in 2-3 years would like something better. Any other suggestions for sealants? I have Vulkem 116, Trempro 636 and Parbond. I can get Sikaflex 215 and 221 locally, but can't get the 915.
That's Sikaflex 715.

No wonder you can't find it

221 works also, but it does not self-level. You can smooth it with a plastic putty knife though and get very nice results. If your a neat freak, you can even add masking tape to have a perfect line around the flange.
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Old 07-19-2010, 01:29 PM   #9
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That's what I get for going by memory.. Ha! I hope that I asked for 715 and wrote 915. Regardless, they only mentioned having the 215 and 221. Leaving right now to get some 221 hopefully in silver or gray and yes I will be taping it off. Thank you.
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Old 07-20-2010, 01:27 AM   #10
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Is there a reason not to use Tempro 636?
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Old 07-26-2010, 10:05 PM   #11
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When a manufacturer provides a gasket, they probably have tested that to be a proven solution. Quit trying to fight the system mark. . . . just get in the gasket line like the rest of us. . .
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Old 07-27-2010, 07:44 AM   #12
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Actually most RV products are not made specifically for an Airstream, so many of these products require different methods of installation when being installed on an Airstream. I've installed the gaskets and will be sealing the edge with a product yet to be determined.
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Old 07-27-2010, 08:03 AM   #13
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I have put in Fantastik Fans and Maxx Fans. The Fantastik Fan comes with a foam gasket and the Maxx Fan recommends butyl. At a restoration rally using the foam gasket was not recommended. I spoke with Fantastik Fan who use the foam gasket for installs at Internationals. Where the fans meet the roof the design is essentially the same. I used Vulkem around the flange. Seems to me butyl is a better choice. Vulkem is also used to replace the gasket altogether.
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Old 07-27-2010, 08:16 AM   #14
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Just completed the MaxxAir coversion ala Lewster's recommendations and it came out great ! Excellent product that I would not hesitate to recommend and worth the extra dough.

Don't over think this stuff, it really isn't all that complicated. If you can work your tools and have an idea of what the job entails, when you get up there, you'll figure out the rest.

Happy caulking !

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