Eshield - R-Value vs. E-value

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

conduction

convection

emission

heat transfer through contact between solid objects

air circulates and passes heat from one object to another

direct transfer from a radiant heat source like the sun

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.