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R-value refers to the thickness of the insulation.
R-value refers to insulation's resistance to heat flow, not to its thickness. Tiny air pockets trapped in the insulating material resist the passage of heat -- heat gain in the warm summer months, and heat loss in the colder months. The higher the insulation's R-value, the greater its insulating power.
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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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