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Old 02-28-13, 01:13 AM   #35
ecomodded
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I feel , with the outside seal in place, stay away from the interior Xps.
From what I have picked up, it pretty much dictates to using the more the breathable choice/cellulose.

At least cellulose is people friendly /lung and skin as opposed to fiberglass.
I am unsure of Cellulose's lifespan with its rated R-value, I know The Expandable Foam they inject in refrigerators starts to lose its R-value in 10 years or so.
fiberglass all though nasty may hold out for the long run, a pure guess on my part.
Worth further investigating never the less..
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