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Old 05-27-2013, 07:57 PM   #11
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I've been looking into resealing my 2012 jayco 5th wheel windows after reading about how jayco is using foam sealant in the windows.

After checking around I found a foam sealant that supposedly out "performs" butyl tape. Any chance that this is what jayco uses and replacing what's sealing my windows with butyl could be a step back?

http://www.emseal.com/Products/Specialty/MST/MST.htm
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Old 05-27-2013, 08:13 PM   #12
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The MST sealant foam looks like an interesting product. With a hard sided trailer, there is virtually no space between the window flange and the side of the trailer. Butyl tape fills it really well and is a proven product. That MST foam might be just the thing for sealing windows in aluminum sided trailers, though.

The major problem I found in how Jayco installed windows in my trailer was not the sealant, but the fact that the windows were not installed in the center of the cutout hole which made the sealing width between the flange and the side of the trailer very small. In many cases, as small as one eighth of an inch and in a few cases almost nothing -- ie, there was almost a crack. Leaving the windows sealed as is means that the centering problem won't be fixed.

If you do leave the windows as is, I'd encourage you to caulk the top edge and completely around he top curved corners and down the side a couple of inches. Even Jayco recommends the "cap" of caulk.

To answer a previous question, when I resealed my windows I applied the butyl to the flange of the window.
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Old 05-27-2013, 08:20 PM   #13
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Thanks rvhiker. Yeah I kind of forgot about the centering problem, wish there was a way I could check w/o pulling them off. For now I am definitely going to cap the top of the windows.

There is a link talking specifically about rv's. http://www.emseal.com/Products/Specialty/RV/RVS.htm
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Old 05-27-2013, 08:28 PM   #14
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Maybe you'd want to remove one of the smaller windows to check on how Jayco did. Maybe they just had a bad day when the crew installed my windows (though I doubt that's the explanation). Good luck whatever you decide.
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Old 05-27-2013, 08:50 PM   #15
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Yeah I might go that route for starters. First though I need to locate some butyl tape, all the rv dealer near me had was putty tape and i've heard that it dries out over time so i'll keep hunting down butyl.
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Old 05-28-2013, 09:43 AM   #16
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I located some butyl tape but it's 3/32, would that work or is it going to be touch to thin?

Also RVhiker did you do any shimming on the sides of the windows to help keep them centered or will the new butyl do that job good enough.
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Old 05-28-2013, 01:29 PM   #17
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That butyl tape may "officially" be one eighth inch; on the roll it kind of gets smashed around. I expect it will be thick enough; if not, just smash another layer of the butyl down on top of the first layer. If you get a good "ooze" at the seam when you re-install the window, you know you had enough butyl. Be sure to mark the opening some how so that when you re-install the window, you can get it better centered than Jayco. I used short pieces of electrical tape, and placed the tape one eighth beyond where I wanted the window edge to go so that the tape would not get caught between the window and the side of the trailer.

I shimmed sides and bottom and just used some cedar shims I bought at the lumber yard. However, I really think that with the butyl's stickiness and the tightness of the flange against the window that the window would not move; but better safe than sorry. In fact, originally I did not plan to use shims and then got worried about the window sliding down so I removed the inside window ring and inserted the shims; the butyl held the windows quite steady. That may be the way to do it, anyway; I'm not sure how the shims can be put in as the window is being installed - for me, it would be just too much stuff to hold at the right place all at the same time.
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Old 05-28-2013, 03:47 PM   #18
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Thanks!
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Old 07-03-2013, 09:38 AM   #19
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Well we've just finished re-sealing the windows on our 23.5' HT 5th wheel, using butyl tape.

I can only say that I'm so glad I went ahead and did this as I can't imagine the foam seal that Jayco used could have lasted very long.

Like everyone on here said it wasn't very difficult, quite easy actually. When we took out the first window my wife said they don't even have a seal in this one, that alone should be an indicator of just how thin the seal they used compressed to. My thinking is that they use the foam seal mainly because it would be just a lot quicker to apply not because it could possibly be better, their application by the way left a lot to be desired as it wasn't applied very evenly at all.

Thanks again to everyone in this thread for the tips and ideas!
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