Blown Attic Insulation R Value Per Inch

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. Here are the r values per inch of the most common types of insulation. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2.

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Solid wood has an r value of 1.

Blown attic insulation r value per inch.

When determining how much insulation you need don t guesstimate calculate. Therefore a three inch thick board has an r value of 3. This calculator is to be used as an estimating tool only. Input length width and desired r value of the area to be insulated.

The total r value of installed insulation is. Click the button to calculate the approximate r value for this job. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Know exactly how much you need with our project calculators.

Achieving the desired r value depends on both the depth of the insulation and its density. As a benchmark one inch of solid wood has an r value of 1. R stands for resistance and the higher an insulation s r value the more efficiently it resists transfer of heat from a warm zone into a cooler zone. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3.

R value of insulation by type. How is insulation r value calculated. Input depth of existing blown in insulation in inches. This calculator is to be used as an estimating tool only.

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 you can see there s some variation in r value depending on the particular type and brand of products used. Atticat expanding blown in pink fiberglas insulation nominal bag weight 28 5 lbs. R value bags per 1000 sq.

R value measures how well certain building insulation materials can resist heat. Minimum thickness inches minimum settled thickness inches 13 5 9 168 5 0 169 4 75 4 75 19 9 1 109 5 0 26 7 7. An r value is also calculated per inch of width. The higher the r value the greater the insulation performance.

Maximum net coverage sq. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Let s start with an example.

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