Insulation Value is not graded with A, B, C D, or F….it is graded on an R-value
Posted onShutter insulation – Insulation is rated on its ability to insulate cold and warm from the exterior to interior. The rating used is based on an R-value rating. The higher the R-value the more insulated the product. In general: Attic space is R-19 to R-38, Walls are R-13 Windows are only R-3.5 That is a […]