The average recommended level is 17 inches of r60.
How many inches of insulation does an attic need.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
The higher the r value the better job the insulation does at preventing the transfer of heat.
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.
The higher the r value the better the thermal performance of the insulation.
Add the right kind of insulation.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
Inspecting your attic insulation.
In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended.
How well a particular insulation works is expressed by the r value which ranges from 2 0 to 8 0 per inch of insulation.
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.
Having enough insulation in your attic is one of the best ways to save energy on both heating and cooling your home.
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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.
In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill.
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.
The average recommended level is 14 inches of r49.
These r values are a sum meaning this should be the total r value once you add up the entire depth 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.
Therefore a 3 1 2 inch wall cavity filled with fiberglass batts has an r value of 10 15 to 13 3.
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.
Most batt insulation carries an r value of 2 9 to 3 8 per inch.
