Desired R Value For Attic

Existing 3 4 inches of insulation.

Desired r value for attic.

There are many ways to retrofit a home with fiberglass and. The recommended r value for attic floor insulation for this house is r 38. For houses in the northeastern united states or other colder areas you might need attic insulation with an r value as high as r 60. Your home s age if your home is more than 10 year old you likely need more insulation.

The homeowner could then check table 1 to find several choices. For houses in a southwestern state or other areas with generally warmer temperatures you might need attic insulation with an r value of only r 30. Where you live different climates require different insulation r values. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

If the existing attic floor insulation has an r 11 insulation value then an additional r 27 would be needed to bring the attic floor insulation up to the level recommended for that house. R value insulation chart find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. If the insulation is a foam board or sprayed on foam use any visible label information or multiply the thickness in inches by 5 to estimate the r value. Recommended insulation levels for retrofitting existing wood framed buildings.

Add insulation to attic.