Frequently Asked Questions

R-value is a measure of the ability of insulation to block transfer of heat through conduction.  Looking at R-value alone is not a good way to measure the effectiveness of heating and cooling in a home.  You will typically see fiberglass batts and cellulose insulation have R-values ranging between 11 and 30.  The higher number the greater the ability to block heat transfer through conduction.  Because it is fairly easy to calculate R-value, it is the most common way that is used to measure the effectiveness of insulation.  However, heat transfer through conduction (R-value) is NOT a good measure of determining the overall efficiency of insulation.  Heat transfer through radiation and air transfer (convection) play a greater role.  Fiberglass batts may be good at blocking heat transfer through conduction, but air can pass right through the batts and does little to help block heat loss through convection.  You need to look at the whole picture to determine the effectiveness of insulation in your home.