Insulation R Value vs. E Value

The R value of insulation is a measure of how effective it is at resisting two forms of heat transfer: conduction and convection. Conduction is when heat is transferred between solid objects, while convection is when heat is passed from one object to another through air circulation. Both of these forms of energy transfer can be straining on utility bills, which is why insulating homes with a high R value product is extremely important. However, there is a third type of heat transfer, emission, which is actually far more detrimental to utility bills if homes are left unprotected.

Emission is the direct transfer of heat from a radiant source – for example, the sun. The ability to protect homes from emission is measured in E value, which standard insulation typically has a very low rating in. Luckily, eShield™ was specifically formulated to protect homes from 97 percent of radiant heat transfer, giving it the highest E value on the market today.

With the addition of eShield™ to standard R value insulation, homeowners can save up to 25 percent on energy bills. Plus, eShield™ can be installed virtually anywhere, including walls, basements, attics, garages, lofts, crawlspaces, and floors.

Please call or e-mail us today for more information about eShield™, the difference between E value and R value insulation, or to set up a home energy audit with one of our green contractors.