Blow In Attic Insulation R Value

Achieving the desired r value depends on both the depth of the insulation and its density.

Blow in attic insulation r value.

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. 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. Your home s age if your home is more than 10 year old you likely need more insulation. 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. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. 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.

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. Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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. Achieving greater r values in exterior walls.

You can achieve better thermal performance in your attic by adding an additional layer of insulation. Where you live different climates require different insulation r values. Click the button to calculate the approximate r value for this job. Recommended insulation levels for retrofitting existing wood framed buildings.

Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. The higher the r value the better the thermal performance of the insulation. Input depth of existing blown in insulation in inches. This calculator is to be used as an estimating tool only.

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. Input length width and desired r value of the area to be insulated. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. Code requirements may also vary for attics and single rafter or joist vaulted roof assemblies.

As a benchmark one inch of solid wood has an r value of 1. There are many ways to retrofit a home with fiberglass and.