What is the approximate R-value for one inch of duct wrap insulation used on round metal ducts?

The R-value measures the thermal resistance of insulation, indicating how well it can prevent heat transfer. For duct wrap insulation specifically used on round metal ducts, an R-value of approximately 3.0 per inch of thickness is standard.

This R-value reflects the effectiveness of the insulation in reducing heat loss or gain as air moves through the ducts. It is essential for maintaining the efficiency of heating and cooling systems in buildings since proper insulation helps to ensure that conditioned air is delivered without significant energy loss.

In contrast, the other values do not accurately represent the typical performance of duct wrap insulation. Lower R-values would indicate less thermal resistance, which is not characteristic of standard duct wrap materials designed to provide effective insulation.