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Old 09-06-2013, 10:36 AM   #1
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spray foam insulation

I was wondering what the forum would suggest for spray on insulation. I would like to know the best method of installing the insulation

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Old 09-06-2013, 10:45 AM   #2
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There was recently a lengthy discussion on this topic--try searching for terms like "spray insulation" and "foam insulation," and you should find it. To offer my own summary, I would say that it is a hot topic, and there are always many more dissenting voices, arguing against the use of expanding foams, compared to those in favor of it. The arguments usually center around the rigidity of the foam limiting the flex of the trailer, its ability/tendency to trap moisture and cause rot, rust, and corrosion, and the probability of it out-gassing toxic chemicals.

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Old 09-06-2013, 10:46 AM   #3
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Here is the recent thread I was thinking of:
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Old 09-06-2013, 11:28 AM   #4
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of course as a counterpoint...
There are companies out there that have been manufacturing spray-in foam insulation for Trucks, RVs, commercial trailers etc, for over 30 years. It seems they have figured something out. I suggest you give one of them a call and explain how you want to use the product and get their opinion.

I am looking into this company But I am not quite to that point in my restoration. Probably next summer/fall.

One question I still need a good answer for is this. If one fully insulates with a spray-in foam insulation and thus removes much of the "flex" in the trailer will there be unintended consequences like excessive bounce or sway? Will it force more suspension activity than it is designed for? I don't know the answer to this.
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Old 09-19-2013, 08:25 AM   #5
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The flexural strength of Aluminum is so much greater than even the most rigid foam,
that there is no chance of foam retarding Aluminum flex.
Take this from a chemical engineer.
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Old 09-19-2013, 09:20 AM   #6
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Avion used spray foam for years in their trailers.
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Old 09-19-2013, 10:15 AM   #7
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I think the spray foam is a great idea. I would be curious if any of the products will react with aluminum and what is the weight of the product for the volume to be installed?

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Old 09-19-2013, 10:45 AM   #8
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The only downside I can see, is for future upgrades that require pulling new wires through the shell walls. It would be impossible with the walls full of rigid foam.
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Old 09-19-2013, 11:02 AM   #9
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I didn't the read the entire thread that was referenced a couple of posts ago. I did read enough to see that everyone seemed to be lumping all spray foam together. I know in building construction there are two main categories: closed cell and open cell. Closed cell is vapor impermeable, very rigid, very high r value, heavier, more expensive. Open cell is flexible, lower r value, and vapor impermeable, less expensive, lighter. Keep that in mind as you research the issue.

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