Input length width and desired r value of the area to be insulated.
How many inches of insulation does an attic need.
Most batt insulation carries an r value of 2 9 to 3 8 per inch.
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In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill.
This calculator is to be used as an estimating tool only.
In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill.
Input length width and desired r value of the area to be insulated.
Fiberglass and rock wool batts are probably the most popular options and are easy to install in unfinished walls and attics.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
Inspecting your attic insulation.
Add the right kind of insulation.
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.
How much insulation in attic for zones 1 4.
The higher the r value the better job the insulation does at preventing the transfer of heat.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
Therefore a 3 1 2 inch wall cavity filled with fiberglass batts has an r value of 10 15 to 13 3.
The higher the r value the better the thermal performance of the insulation.
The average recommended level is 17 inches of r60.
How well a particular insulation works is expressed by the r value which ranges from 2 0 to 8 0 per inch of 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.
Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
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.
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.
Having enough insulation in your attic is one of the best ways to save energy on both heating and cooling your home.
