Attic Insulation R Value Depth

Achieving the desired r value depends on both the depth of the insulation and its density.

Attic insulation r value depth.

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. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. If you ve reached your target depth but still have a few bags left over keep adding the material at an even depth throughout the space until all the bags your calculations called for are empty. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3.

Add the right kind of insulation. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. There are many ways to retrofit a home with fiberglass and. The higher the r value the better the thermal performance of the insulation.

Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. The higher the r value the better the thermal performance of the insulation. Existing 3 4 inches of insulation. Where you live different climates require different insulation r values.

In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. Click the button to calculate the approximate r value for this job. Add insulation to attic. 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.

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. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Recommended insulation levels for retrofitting existing wood framed buildings. Input depth of existing blown in insulation in inches.

Achieving greater r values in exterior walls. Your home s age if your home is more than 10 year old you likely need more insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. R value is a measure of insulation s ability to resist heat flow.

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