Blown In Insulation Attic R Value

This calculator is to be used as an estimating tool only. If your home is in a warmer climate you require an r 38 or higher or about 12 more. This calculator is to be used as an estimating tool only.

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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.

Blown in insulation attic r value.

Recommended insulation levels for retrofitting existing wood framed buildings. Click the button to calculate the approximate r value for this job. 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. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Existing 3 4 inches of insulation. Add insulation to attic. Where you live different climates require different insulation r values. There are many ways to retrofit a home with fiberglass and.

Input depth of existing blown in insulation in inches. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Input length width and desired r value of the area to be insulated. 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 depth in inches and pounds of total insulation required for this job. As you can see there s some variation in r value depending on the particular type and brand of products used. Your home s age if your home is more than 10 year old you likely need more insulation. As a benchmark one inch of solid wood has an r value of 1.

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. 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.

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