Doesn’t my house already have insulation?

Probably, but does it have enough? If your house was built within the last 30 years, it will likely have some insulation. In northeastern states, residential energy code requires R-38 for attics in new construction. The Dept of Energy now recommends R-49 in attics, as does Home Doctor of America. There is less flexibility to improve walls that contain existing insulation and usually the best option is to air seal them. Most 2×4 walls can contain no more than R-11 and 2×6 walls can hold R-19. Batt insulation must be properly placed and cover the entire cavity which rarely happens. Air sealing requirements were not understood. Without air sealing any existing insulation is not giving you the R-Value expected.

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