There are three ways that heat can be transferred in and out of your home:

R-value measures only the resistance to conduction and convection, but almost all of the energy lost in your home is through emission – radiant heat transfer. "E-value" (the ability to prevent radiant heat transfer) is far more important than R-value in evaluating an insulation system. eShield™™ Attic Energy Barrier has a much higher E-value than any form of mass insulation.

CONDUCTION heat transfer through contact between solid objects	CONVECTION air circulates and passes heat from one object to another	EMISSION direct transfer from a radiant heat source like the sun