Foil or felt faced polyiso
Is there any major difference between foil faced and felt faced polyiso in normal applications (wall sheathing for above-grade walls)? Is the foil facing more stable with respect to R value over time?
I ask because the reclaimed insulation guys have felt faced priced lower than foil faced. In my application, the foil facing won’t be facing an air space so it won’t help with IR radiation.
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