Where you live different climates require different insulation r values.
Blown in insulation attic r value.
Depending on where you live it s recommended that attics have a minimum r value of r 30 in warm climates to r 60 in cold climates.
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.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Click the button to calculate the approximate r value for this job.
This calculator is to be used as an estimating tool only.
In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.
Recommended insulation levels for retrofitting existing wood framed buildings.
For homes that are situated in cold climates homeowners need to ensure that they have a minimum of r 49 in their attics this is equivalent to about 16 inches of fibreglass insulation.
As a benchmark one inch of solid wood has an r value of 1.
Input length width and desired r value of the area to be insulated.
Your home s age if your home is more than 10 year old you likely need more insulation.
This calculator is to be used as an estimating tool only.
As you can see there s some variation in r value depending on the particular type and brand of products used.
Add insulation to attic.
If your home is in a warmer climate you require an r 38 or higher or about 12 more.
R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.
There are many ways to retrofit a home with fiberglass and.