Desired R Value For Attic

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

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. 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. The homeowner could then check table 1 to find several choices. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Where you live different climates require different insulation r values. Existing 3 4 inches of insulation. There are many ways to retrofit a home with fiberglass and. Recommended insulation levels for retrofitting existing wood framed buildings.

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. 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.

Add insulation to attic.