Input depth of existing blown in insulation in inches.
How many inches of insulation attic.
Inspecting your attic insulation.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
Input length width and desired r value of the area to be insulated.
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.
In zone 3 the average minimum requirement for attic insulation is 9 inches of r30 fill.
This calculator is to be used as an estimating tool only.
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.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
The average recommended level is 17 inches of r60.
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.
For loose fill cellulose this translates to a total depth ranging from 8 inches.
Input length width and desired r value of the area to be insulated.
Click the button to calculate the approximate r value for this job.
Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values.
Note from this chart that the ideal r value differs for each part of your home.
In zone 4 the average minimum requirement for attic insulation is 11 inches of r38 fill.
This calculator is to be used as an estimating tool only.
In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended.
According to the u s.
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.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.