Example: R-Value per inch (3.6) x 3.5 inches of insulation = R-12.6. (laboratory R-value)

• ConvectionConvection - through airflow (random air leaks). Air leakage can cause up to half of your home's energy loss.
• ConductionConduction - through materials as a result of temperature difference across material (walls, ceilings, insulation)
• RadiationRadiation - in waves (i.e. from sun through windows)

Click here for an illustration showing common air leakage areas in a home.

Building codes in your area usually set a minimal acceptable level of R-value for areas in a home. But if insulation doesn't help stop random air leakage, it's not helping you control the source of up to half of the energy lost by your home (convection).

To make the best insulation investment consider a product offering the best of both worlds: an ideal level of R-value and control of random air leakage.


2. R-value is based on specific laboratory conditions.

In real homes, the R-value advertised can be diminished if insulation gets wet or if it's installed improperly (cut improperly or compressed into wall cavities).




3. Surprise! More or thicker insulation and higher R-values are not always better.

Most (93%) conductive heat flow (heat flow through a solid) is already controlled by R-12 insulation.  That means doubling R-value (from R-12 to R-24 for example) won't double your savings. Learn more.