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Old 11-12-2012, 04:38 PM   #1
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Spray foam the shell of an Aiirstream

Hi all

I have a completely stripped sovereign airstream and we are considering whether to use a spray urethane foam in the shell. what are the negatives to this approach

thank you all in advance

Russ
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Old 11-12-2012, 04:58 PM   #2
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I believe there are other threads you can find in search tab above by typing words like "insulation replacement" or "urethane insulation".. From memory, the foam still won't eliminate cold or warm inner skins, due to metal to metal contact along ribs. It may make any future re-wiring or re-plumbing more difficult, and should be selected to make sure mice or rodents don;t enjoy digging in and living there. I think there may have been issues with out-gassing as well, but that also probably depends on type chosen, and opportunity to dry and air out before inner walls restored..
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Old 11-12-2012, 05:45 PM   #3
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I remember a discussion on this and there was a concern that the movement and vibration of a trailer in motion would break down the foam.

As the foam broke down it would pool at the bottom and you would lose your insulation.
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Old 11-12-2012, 05:54 PM   #4
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Hi Russ,

Avion used spray applied foam insulation with great success. The insulation in our 73 has held up very well. I'd research the product thoroughly though before trying anything like this today, but it is do-able.

Kevin

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Old 11-12-2012, 07:39 PM   #5
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I would think foam would not stand up well to the heat inside the walls. The vibration may destroy it. With the ribs limiting isolation of interior/exterior walls, the advantage of foam may be limited. Leaks happen in Airstreams and the foam may prevent drying of the wall space.

All things considered, fiberglass is a proven material for this use.

doug k
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Old 11-12-2012, 08:09 PM   #6
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If you use 2 pound, closed cell insulation, water wouldn't be able to penetrate the insulation. 1/2 pound is open cell and would absorb water. If the product can stand up to trailer movement, I think it might be a viable option. It certainly wouldn't provide nesting for critters.
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Old 11-12-2012, 08:16 PM   #7
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As Kevin said, Avions used foam insulation.
We are currently working on one at the moment and we can tell you that it works great even after 22 years!
If you see Darkspeed thread, he used ceramic paint and foam insulation, we were inside that trailer and will testify that it was just awsome! It works great regarding the insulation properties and regarding the cracking od the foam, will take som pics of our walls and you will see that looks just fine..
Just our 2 cents..
Can't wait to see how your trailer looks now..any pics?
Will get back to you with some pics..
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Old 11-12-2012, 10:19 PM   #8
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The Airstream has a plywood floor, does the Avion?

The effect of an insulation material change ought to be considered on the whole structure, not just the shell.

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Old 11-12-2012, 11:11 PM   #9
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Quote:
Originally Posted by dkottum
The Airstream has a plywood floor, does the Avion?

The effect of an insulation material change ought to be considered on the whole structure, not just the shell.

doug k
Yes. A double layer.

http://www.airforums.com/forums/f417...ml#post1226268
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