Blown In Insulation Attic R Value

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. As you can see there s some variation in r value depending on the particular type and brand of products used.

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This calculator is to be used as an estimating tool only.

Blown in insulation attic r value.

If your home is in a warmer climate you require an r 38 or higher or about 12 more. Click the button to calculate the approximate r value for this job. There are many ways to retrofit a home with fiberglass and. 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.

Input depth of existing blown in insulation in inches. 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. Click the button to calculate the depth in inches and pounds of total insulation required for this job. As a benchmark one inch of solid wood has an r value of 1.

This calculator is to be used as an estimating tool only. 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. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. 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.

Your home s age if your home is more than 10 year old you likely need more insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Recommended insulation levels for retrofitting existing wood framed buildings. Existing 3 4 inches of insulation.

Add insulation to attic. Where you live different climates require different insulation r values.

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