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Or is this just another myth in the world of building science?
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I've been guilty of perpetuating a myth. Not long ago I wrote an article in which I said installing insulation, "cavities [should be] filled completely with as little compression as possible." But is compression really such a bad thing? Here on GBAGreenBuildingAdvisor.com, commenter Dana Dorsett wrote, "Compression of batts is fine (resulting in a higher R/inch due to the higher density) as long as the cavity is completely filled.”
from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/compressed-fiberglass-insulation-really-problem
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