Apparently we recently completed the biggest shell upgrade in the NJ Home Performance with Energy Star program. Installed around 80 sheets of Thermax. While I'm sure Dow loves us, I have mixed feelings about putting totally impermeable stuff on below-grade walls. AFAIK, Thermax is the only rigid foam that can be left exposed in virtually any part of a home owing to code requirements related to the flammability of most foams. In this case there were no moisture problems in the space, so probably very low risk from a permeance perspective. Also, Thermax is a type of polyisocanurate which has considerably less environmental impact (See Alex Wilson's stuff) than all other types of foam. I suppose one never really finds the perfect solution to every problem.
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