I agree with herlichka about stopping moisture transmission past the interior envelope. I too have experienced moisture condensation on the inside of the exterior side of a wall, mold forming between the insulation and the OSB. Warm air readily absorbs moisture and when it finally trickled past the insulation the moisture condensed on the exterior side of the wall cavity and the colder air trickled down and out the bottom. Stopping the air flow stopped the moisture flow and consequently the condensation.
Foaming in the can should stop the moisture transmission as well as the heat shouldn't it? I don't understand how the foam can stop one without the other.
I like the idea of using the fire foam instead of regular foam, if the price the same why not? What is the difference of melting point of the two? Not that it's a big deal but it would be nice to know how much extra (if any) thermal integrity it has.
Thanks for the discussion. This is really great stuff.
I know, bad joke =)
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