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Residential energy codes generally have three options for compliance: prescriptive, performance, and Energy Rating Index compliance paths. The two prescriptive methods, the R-value and U-factor alternative, compare the home’s component thermal characteristics against prescriptive measures. Depending on the jurisdiction, to comply with the prescriptive, performance or ERI paths, there are reports and calculations to show correct computation and reporting. However, the most popular in Florida is performance, found in section R405