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Charlotte, North Carolina Reschecks currently use the North Carolina Energy Code. In Ceilings you typically see R values of insulation that are R30 and above and walls typically fall the in the R15 and greater range with some passing at R13. If you plan to build an exposed slab you should plan to insulate it with at least an R 4, subfloors need an R 19, Windows and glass doors need .30 u factor and below, and a basement wall should plan for R11 Continuous or greater.

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