How Many Inches Of Insulation Attic

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3.

How many inches of insulation attic.

In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. Fiberglass and cellulose insulation have r values of 2 9 to 3 8 per inch while sprayed foam insulation can go as high as 8 0 per inch. In zone 3 the average minimum requirement for attic insulation is 9 inches of r30 fill. Inspecting your attic insulation.

First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. Click the button to calculate the approximate r value for this job. For loose fill cellulose this translates to a total depth ranging from 8 inches.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Add the right kind of insulation when adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. The average recommended level is 17 inches of r60. This calculator is to be used as an estimating tool only.

Department of energy it s recommended that attics have an r 38 to r 49 or about 12 to 15 of fiberglass or cellulose insulation. According to the u s. Once you ve determined the r value of insulation you need to decide which type of insulation you will use. Click the button to calculate the depth in inches and pounds of total insulation required for this job.

Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values. Input length width and desired r value of the area to be insulated. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. In zone 4 the average minimum requirement for attic insulation is 11 inches of r38 fill.

Input depth of existing blown in insulation in inches. Input length width and desired r value of the area to be insulated.