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  #1  
Old 12-20-2017
djlcanuck djlcanuck is offline
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Question Wall insulation

As I'm pulling the bird apart I have noticed that the spray foam insulation in the walls around the windows is probably 6 inches from the bottom of the windows.
Is this:
a)Normal Don't worry about it
b) has settled after 20+ years and should/could be topped up
C) has shrunk due to water damage and should/could be topped up
If I top it up should I use anything specific "great stuff"?

I would appreciate comments from anyone who has seen inside their walls

Thanks

Doug
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  #2  
Old 12-21-2017
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alvahall alvahall is offline
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Doug, noticed the same thing on our coach. Stuffed all the windows and the door voids with fiberglass insulation. Big difference this year.
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  #3  
Old 12-21-2017
k1100lt k1100lt is offline
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Where-ever there was foam missing on mine I used 1/4 plywood as a form and used spray can foam to top it up. Secure whatever form material you choose to use and leave it in place until the new foam expands and dries. I stapled plastic wrap on the foam side of the plywood to prevent the foam from sticking to the plywood. I used closed cell foam similar to the original BB application.
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Last edited by k1100lt; 12-21-2017 at 12:27 PM. Reason: Clarification-closed cell-open cell foam
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  #4  
Old 12-21-2017
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If you go the foam route I would spend the extra money for the closed cell foam. It is much more efficient than open cell or "great stuff". Great stuff is ok for a quick fill of a hole here or there but not so much for a big job, because it is open cell. Don't know how much you are dealing with but you can get it on Amazon for various sized jobs. Remember is expands something like 30 times its original volume so go slow or you will have more work than you bargained for.
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Old 12-21-2017
rrueckwald rrueckwald is offline
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There has been some discussion on the forum in the past about that spray foam causing severe corrosion on steel. I have therefore avoided using it in contact with steel. There must be an acceptable type, since BB used it. Can anyone with experience with this comment?
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  #6  
Old 12-21-2017
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Randy Dupree Randy Dupree is offline
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i ruined a nice old truck by using
great Stuff,the truck rusted out in less than a year,any place where the foam touched un-painted steel.
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  #7  
Old 12-21-2017
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Quote:
Originally Posted by rrueckwald View Post
There has been some discussion on the forum in the past about that spray foam causing severe corrosion on steel. I have therefore avoided using it in contact with steel. There must be an acceptable type, since BB used it. Can anyone with experience with this comment?
Quote:
Originally Posted by Randy Dupree View Post
i ruined a nice old truck by using
great Stuff,the truck rusted out in less than a year,any place where the foam touched un-painted steel.
Those are good points to consider. If it is unpainted steel it could be a real issue. Even vapor could possibly cause an issue. But I think that is one advantage to the closed cell foam, because it is a vapor barrier. But open cell foam like Great Stuff is open cell and it needs an independent vapor barrier.
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  #8  
Old 12-21-2017
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BB used closed cell. Its at least twice the R-value of open cell (great stuff). I would not use open cell as stated previously.

The closed cell is also more resistant to water. This may explain the corrosion issues reported with the use of open cell if it holds water.
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  #9  
Old 12-21-2017
djlcanuck djlcanuck is offline
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Thumbs up

Thanks for all the great reply's guys!
Can anyone
a) advise a brand of closed cell foam to use?
b) has anyone else used fiberglass bat?
It sounds easier (just stuff it in) and no rust issues.

Thanks
Doug
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  #10  
Old 12-21-2017
k1100lt k1100lt is offline
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I do not know enough to comment on the fiberglass batt suggestion. I would be concerned about condensation with/without a plastic vapour barrier and the metal sheeting on the outside of our birds though. I am sure someone with more knowledge will have a definitive answer.
I do not recall the brand name of the closed cell insulation that I used. It was clearly identified on the container though.
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