Desired R Value For Attic

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. Look at your ductwork. It will most likely be a fiberglass batt so multiply the thickness in inches by 3 2 to find out the r value or the r value might be visible on a product label.

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The homeowner could then check table 1 to find several choices.

Desired r value for attic.

Recommended insulation levels for retrofitting existing wood framed buildings. 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. 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. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

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. Where you live different climates require different insulation r values. There are many ways to retrofit a home with fiberglass and. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

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. Your home s age if your home is more than 10 year old you likely need more insulation. The recommended r value for attic floor insulation for this house is r 38. Existing 3 4 inches of insulation.

Add insulation to attic.