What is the required R-value for exterior walls in a climate zone with a moderate climate category?

The required R-value for exterior walls in a climate zone with a moderate climate category is established to ensure adequate thermal performance of the building envelope, contributing to energy efficiency and comfort within the home. In moderate climates, where the climate does not experience extreme temperatures, an R-value of R-20 is necessary. This level of insulation strikes a balance, providing sufficient resistance to heat flow to reduce energy consumption for heating and cooling while accommodating the specific thermal demands of the region.

Higher R-values, such as R-30, may be more appropriate for colder climates where increased insulation is crucial to manage heat loss. Conversely, R-values like R-13 or R-15 may not provide sufficient thermal resistance in moderate climates, potentially leading to higher energy bills and discomfort. Therefore, R-20 is the optimal choice as it meets the code requirements for effective insulation in areas experiencing moderate temperatures.