Blow In Attic Insulation R Value
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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.
Blow in attic insulation r value. Achieving the desired r value depends on both the depth of the insulation and its density. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. Existing 3 4 inches of insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
You can achieve better thermal performance in your attic by adding an additional layer of insulation. 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. 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.
Click the button to calculate the approximate r value for this job. 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. The higher the r value the better the thermal performance of the insulation. Input length width and desired r value of the area to be insulated.
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. Code requirements may also vary for attics and single rafter or joist vaulted roof assemblies. Add insulation to attic. Achieving greater r values in exterior walls.
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. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. 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. As a benchmark one inch of solid wood has an r value of 1. 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. Recommended insulation levels for retrofitting existing wood framed buildings.
Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. Click the button to calculate the depth in inches and pounds of total insulation required for this job.
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