Quote:
Compressing lowers the R value considerably. It is the air, trapped in the insulation, that gives the resistance to heat flow. Compressing the insulation reduces the amount of air and the R value.
By a lot.
bottom line - don't compress!
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If this was true then dense pack cellulose would provide no benefit at all. Cellulose fibers actually add the insulation value and dense packing it cuts way down on air infiltration.