Blown In Insulation R Value Per Inch

As you can see there s some variation in r value depending on the particular type and brand of products used. Where you live different climates require different insulation r values. For example a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall.

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A Chart Of R Values Broken Up By Zone And Placement In The Home Types Of Insulation Insulation R Value Roof Insulation

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Maximum net coverage sq.

Blown in insulation r value per inch.

An r value is also calculated per inch of width. Let s start with an example. Your home s age if your home is more than 10 year old you likely need more insulation. Solid wood has an r value of 1.

A particular end use. Atticat expanding blown in pink fiberglas insulation nominal bag weight 28 5 lbs. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Here are the most common insulation materials listed in order of lowest to highest r value.

How is insulation r value calculated. You only need four inches of r 3 5 cellulose in a wall cavity to exceed the recommended insulation level of r 13 for walls located in zone 4. Loose fill cellulose is rated between r 3 2 and r 3 9 per inch making it one of the least efficient insulation materials available. Blown fiberglass installed in the attic has an r value of 2 2 per inch so 12 inches of it would give you an r value of 26 4 in your attic installation project.

Minimum thickness inches minimum settled thickness inches 13 5 9 168 5 0 169 4 75 4 75 19 9 1 109. 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. You d need a thickness of. Depending on where you live it s recommended that attics have a minimum r value of r 30 in warm climates to r 60 in cold climates.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Therefore a three inch thick board has an r value of 3. R value bags per 1000 sq. As a benchmark one inch of solid wood has an r value of 1.

Click the button to calculate the approximate r value for this job. Values are reported to the nearest fi ve 5 rating. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. This calculator is to be used as an estimating tool only.

There are many ways to retrofit a home with fiberglass and. However cellulose is inexpensive environmentally friendly and easy to install behind finished walls. Input length width and desired r value of the area to be insulated. Input depth of existing blown in insulation in inches.

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. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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. This calculator is to be used as an estimating tool only.

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