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I am not sure where you heard this but the thickness of old putty against the thickness of insulation for r-value is not as good. The best insulator is air. Fiberglass insulation

has a high r-value because of the air it holds not the fiberglass itself. So that's why you don't cram 6in fiberglass into a 4in space, it does not work when you compress it.

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16y ago

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