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Old 10-13-09, 07:24 PM   #8
Daox
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Interesting, but a bit contradictory. Your third link says that foil faced polyiso is 22 times better at blocking moisture than XPS.

I'll have to do some more digging. I'm sure there are problems, but getting data that says polyiso from the extruded polystyrene foam association doesn't seem like the most unbiased source, haha. They did source an Oak Ridge National Lab study, but we have no way of knowing the conditions of that test.

Thanks AC Hacker.
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