What "R-value" Really Means?
R-value is a measure of resistance to heat flow through a given thickness of material. In theory, the higher the R-value, the greater the resistance. That’s true to a point, but it’s just one of four key factors that determine the effectiveness of an insulation material.
Insulation is, first and foremost, meant to stop the movement of heat. The problem with using R-Value as the sole yardstick of an insulation’s effectiveness is that heat moves in and out of a home (or any building) in four ways: conduction (which R-Value measures), and by convection, radiation and air infiltration (none of which R-Value measures). Cellulose insulation offers high R-Value while also controlling these other three important insulation factors. To learn more switch to the full site view.
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Click on this map to find insulation R-Value recommendations from the U.S. Department of Energy for your region.