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How many inches of insulation attic. In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill. If you need to add insulation in your attic save big by blowing in cellulose insulation yourself. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. How much insulation in attic for zones 1 4.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. We ll walk you through the steps to help you find the right type of fiberglass attic insulation and the right amount. The average recommended level is 17 inches of r60. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended.
Inspecting your attic insulation. The pros charge 1 500 to 2 000 to do a 1 200 sq ft. Add the right kind of insulation. Click the button to calculate the depth in inches and pounds of total insulation required for this job.
Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. The higher the r value the better the thermal performance of the insulation. For loose fill cellulose this translates to a total depth ranging from 8 inches.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. First you ll need to determine your r value. Fiberglass and cellulose insulation have r values of 2 9 to 3 8 per inch while sprayed foam insulation can go as high as 8 0 per inch. This calculator is to be used as an estimating tool only.
The higher the r value the better job the insulation does at preventing the transfer of heat. When adding additional insulation you do not have to use the same type of insulation that currently exists in your. Blown in insulation overview. You can do it yourself for about 500.
The recommended r value for attic insulation in ontario is between r 50 and r 60. The average recommended level is 14 inches of r49. If it s a new building simply reference the energy code map. In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill.
How much does attic insulation cost. Input length width and desired r value of the area to be insulated. R values of common types of insulation.
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