Insulation levels are specified by R-Values, a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value, the better the thermal performance of the insulation. The table below shows what levels of insulation are cost-effective for different climates and locations in your home.
To convert from one to the other use the following formulas:
1/R-value = U-value or 1/U-value = R-value
Example: R-19 (common for walls) = 1/19 = U-Value of .053