Blow In Attic Insulation R Value

You can achieve better thermal performance in your attic by adding an additional layer of insulation. Code requirements may also vary for attics and single rafter or joist vaulted roof assemblies. Attic insulation 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.

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The higher the r value the better the thermal performance of the insulation.

Blow in attic insulation r value.

Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. When blown into attics and wall spaces loose fill fiberglass offers an average r 2 5 thermal value per inch the higher the number the greater the insulating effect. 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.

Where you live different climates require different insulation r values. Add insulation to attic. Achieving the desired r value depends on both the depth of the insulation and its density. 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. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Recommended insulation levels for retrofitting existing wood framed buildings. Click the button to calculate the approximate r value for this job.

You d need a thickness of. This calculator is to be used as an estimating tool only. Achieving greater r values in exterior walls. Blowing the insulation should take less than 1 5 hours and the whole job can be completed in less than 4 hours based on a 1 000 sq.

The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Existing 3 4 inches of insulation. The specially designed atticat machine conditions the insulation by adding millions of tiny air pockets that give the material its insulating power and energy saving r value over time. 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. If your home is in a warmer climate you require an r 38 or higher or about 12 more. There are many ways to retrofit a home with fiberglass and. Input depth of existing blown in insulation in inches.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

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