How much insulation is needed?
Floors – R-19 Heat doesn’t just rise; it goes from a warm surface to a cold surface so it is beneficial to insulate floors with fiberglass. Carpeting adds an R-value of 1.3. * Ceilings – R-38 Insulate attic access doors with weather-stripping. (Attic access doors are often located right above the thermostat.) * Walls – R-19 If an older home does not have wall insulation, do not insulate unless a total renovation is planned. Blown-in insulation is not always cost-effective for older homes with no wall insulation. * Windows Storm windows add little R-value. Their benefit comes from reducing air infiltration.
