R-value is a measure of thermal resistance used in the building and construction industry. Specifically, R-value is thermal resistance to heat flow. The higher the R-value number, the better the insulating properties of the material. However, an R-16 value is not twice as good as an R-8 Value. R-16 does not offer twice as much thermal resistance or twice the energy savings of an R-8 value. A value of R-16 offers a 5% reduction in heat flow and a 5% improvement energy efficiency than a value of R-8, not 50%. No matter the R-Value, an insulated garage door will reduce the amount of heat flow and improve energy efficiency of a home.