Blown In Attic Insulation R Value Per Inch

The r value of insulation is a measure of how well it reduces the flow of heat and cold into and out of your house. Click the button to calculate the depth in inches and pounds of total insulation required for this job. While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country.

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The r value of loose fill cellulose is r 3 2 to 3 8 per inch2.

Blown in attic insulation r value per inch.

Your home s age if your home is more than 10 year old you likely need more insulation. Where you live different climates require different insulation r values. The most common blown in material used but it can rot and grow moldy if exposed to moisture. Click the button to calculate the approximate r value for this job.

Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. There are many ways to retrofit a home with fiberglass and. As a benchmark one inch of solid wood has an r value of 1.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Fibers from recycled post consumer paper that are treated for insect and fire resistance. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation.

Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage. This calculator is to be used as an estimating tool only. 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. Some installations can yield a higher r value than traditional batt insulation for the same thickness and can fill even the smallest cavities creating an effective air barrier.

Input length width and desired r value of the area to be insulated. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. The higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home. You can use the small pressurized cans of foam.

Achieving the desired r value depends on both the depth of the insulation and its density. Fibers from rock or recycled slag from blast furnaces. The r value per inch for different types of insulation varies depending on the. Input depth of existing blown in insulation in inches.

This calculator is to be used as an estimating tool only.

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