Attic Insulation R Value Depth

You can achieve better thermal performance in your attic by adding an additional layer of insulation.

Attic insulation r value depth.

For loose fill cellulose this translates to a total depth ranging from 8 inches. Existing 3 4 inches of insulation. The higher the r value the better the thermal performance of the insulation. Where you live different climates require different insulation r values.

Your home s age if your home is more than 10 year old you likely need more insulation. R value is a measure of insulation s ability to resist heat flow. Click the button to calculate the approximate r value for this job. The higher the r value the better the thermal performance of the insulation.

Input depth of existing blown in insulation in inches. Recommended insulation levels for retrofitting existing wood framed buildings. Add the right kind of insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

There are many ways to retrofit a home with fiberglass and. But newer homes in central and southern arizona are insulated to ratings of r 30 to r 38 while newer homes in northern arizona generally have attic insulation at r 60 because of colder winters. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. Achieving greater r values in exterior walls.

Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. Achieving the desired r value depends on both the depth of the insulation and its density. To get the target r value from the product you chose use the number of bags your calculations showed that you needed to insulate your attic never fewer. Add insulation to attic.

This calculator is to be used as an estimating tool only.