This calculator is to be used as an estimating tool only.
How many inches of insulation does an attic need.
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.
Inspecting your attic insulation.
In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill.
The average recommended level is 17 inches of r60.
The higher the r value the better job the insulation does at preventing the transfer of heat.
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First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.
The higher the r value the better the thermal performance of the insulation.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
Most batt insulation carries an r value of 2 9 to 3 8 per inch.
The average recommended level is 14 inches of r49.
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 in your attic to reach r 30 if you live in zones 2 or 3.
In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill.
Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values.
In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended.
Fiberglass and rock wool batts are probably the most popular options and are easy to install in unfinished walls and attics.
Input length width and desired r value of the area to be insulated.
This calculator is to be used as an estimating tool only.
For loose fill cellulose this translates to a total depth ranging from 8 inches.
How much insulation in attic for zones 1 4.
Add the right kind of insulation.
Having enough insulation in your attic is one of the best ways to save energy on both heating and cooling your home.
When adding additional insulation you do not have to use the same type of insulation that currently exists in your.
Input length width and desired r value of the area to be insulated.
How well a particular insulation works is expressed by the r value which ranges from 2 0 to 8 0 per inch of insulation.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
