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Stuffing thicker insulation into a smaller space will increase its R-value.
Fiberglass insulation works on the principle of trapped air pockets. By compressing fiberglass insulation, you decrease the amount of air trapped in the material, therefore reducing the overall R-value. So compressing a thick product into a small space won't necessarily give you a better R-value.
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* By insulating and air sealing.
. Savings vary. Find out why in the seller’s fact sheet on R-values. Higher R-values mean greater insulating power.
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