I CAN tell you that according to some builders and contractors (and roofers) those barriers actually cause the roof shingles to wear a bit faster than the lifetime warranty of a shingle suggests. Apparently, the barrier put in the attic contains the heat as it's supposed to ... but it winds up reflecting that heat back out before being absorbed in the attic, which causes the shingles to actually "bake" on both sides ... effectively causing them to get more brittle as time goes on. So, you resolve one issue and create another in long run.
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