what r value for exterior walls

what r value for exterior walls

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The recommended R-value for exterior walls depends on the climate and specific energy efficiency goals of a building. Generally speaking, the higher the R-value, the better the insulation. For example, in colder climates, a higher R-value is typically recommended to keep the heat inside the building and to reduce heating costs. According to the U.S. Department of Energy, R-values for exterior walls in colder climates should be at least R-13 to R-23. In milder climates, a lower R-value may be sufficient. For example, in a moderate climate, an R-value of R-13 to R-15 is typically recommended. However, its important to note that the R-value should be consistent throughout the wall.

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