Volara insulation inside camper
I saw an earlier question re: potentially using Volara foam insulation inside a camper van, but I can’t find any conclusions to that conversation. If the poster is reading this (“smoojee”), I’m curious if you used it?
We plan to use it to create a thermal break in the interior of a teardrop camper (under construction as I type). So the “sandwich” is: Aluminum skin > HDPE (hard plastic layer sealed to aluminum skin > Thinsulate 600L > Volara > Maple hardwood veneer (Soystrong).
I am chemically sensitive, so I like the more healthy factors of Volara compared to other insulations you might use for a thermal break.
But in reviewing the issue of vapor permeability, it seems to rate as near zero. The question is: Will we be trapping moisture vapor in the wall that then can’t get back out? We need to ensure that the “sandwich” can breathe to the interior of the camper, since the exterior is well sealed (complete vapor barrier).
Should we only use it on the interior face of the aluminum framing, that is, as a thermal break? Or should we keep it as one membrane throughout, right below the plywood to prevent moisture vapor from even entering the walls (or to slow down its entrance into and exit from the wall cavity)?
I would very much appreciate any input on how to think this through. URL for Volara: https://www.sekisuivoltek.com/products/volara-polyolefin-foams/
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