How Deep To Make Blow In Insultaion In My Attic

This calculator is to be used as an estimating tool only. 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 helper will feed the blown in insulation into the hopper while you work the hose up in the attic photo 5.

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Hoses that you can connect and snake into the attic.

How deep to make blow in insultaion in my attic.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Input length width and desired r value of the area to be insulated. Ten inches of blown insulation provides an insulating value of approximately r 30 1 inch of fiberglass provides about r 2 7 while 1 inch of cellulose is approximately r 3. Measure your attic s square footage.

The blower should include two 50 ft. For loose fill cellulose this translates to a total depth ranging from 8 inches. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. You d need a thickness of.

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Your choice in insulation can make a real difference in cleanup and mitigation after a burst pipe or house fire. To add to the r value of existing insulation calculate the thickness based on the. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended.

Blown in spray foam batts and blankets. To insulate to r value 50 with an r value of 3 5 per inch you will need 50 divided by 3 5 or about 14 inches. Your options for attic insulation range from radiant barriers to sheets of mineral wool but most homeowners stick with products made from cellulose or fiberglass. For loose fill read labels.

Each bag lists the required depths for a range of r values and the number of bags needed to cover 1 000 square feet at those depths. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Each bag of fiberglass insulation will cover approximately 65 square feet of attic space to a depth of 10 inches cellulose insulation covers half as much. Input length width and desired r value of the area to be insulated.

For batts or rolls calculate the number based on the width and length of the product you re using. This calculator is to be used as an estimating tool only.

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