Blown In Insulation R Value Per Inch

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. Values are reported to the nearest fi ve 5 rating. 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.

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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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Input depth of existing blown in insulation in inches.

Blown in insulation r value per inch.

Let s start with an example. 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. 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. An r value is also calculated per inch of width.

Click the button to calculate the approximate r value for this job. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. How is insulation r value calculated. Therefore a three inch thick board has an r value of 3.

R value bags per 1000 sq. A particular end use. However cellulose is inexpensive environmentally friendly and easy to install behind finished walls. 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.

Minimum thickness inches minimum settled thickness inches 13 5 9 168 5 0 169 4 75 4 75 19 9 1 109. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Input length width and desired r value of the area to be insulated. 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.

As you can see there s some variation in r value depending on the particular type and brand of products used. You d need a thickness of. Solid wood has an r value of 1. There are many ways to retrofit a home with fiberglass and.

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. As a benchmark one inch of solid wood has an r value of 1. Where you live different climates require different insulation r values. This calculator is to be used as an estimating tool only.

Here are the most common insulation materials listed in order of lowest to highest r value. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Maximum net coverage sq. This calculator is to be used as an estimating tool only.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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. Atticat expanding blown in pink fiberglas insulation nominal bag weight 28 5 lbs. Your home s age if your home is more than 10 year old you likely need more insulation.

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