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R-values in our climates
Using the Federal Trade Commission's energy model calculations to determine effective R-values for insulation material, as many designers do, is not realistic and can potentially lead to increased energy costs, poor indoor performance and mechanical equipment being oversized or undersized. Yearly average temperatures are available for many regions across North America and can be used to understand the temperature ranges expected for a location when determining the amount and type of insulation to use in a roof system.