Blown Attic Insulation R Value Per Inch

Know exactly how much you need with our project calculators. 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. Input depth of existing blown in insulation in inches.

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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.

Blown attic insulation r value per inch.

Click the button to calculate the approximate r value for this job. The total r value of installed insulation is. Therefore a three inch thick board has an r value of 3. 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.

This calculator is to be used as an estimating tool only. Solid wood has an r value of 1. 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. Achieving the desired r value depends on both the depth of the insulation and its density.

As you can see there s some variation in r value depending on the particular type and brand of products used. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Atticat expanding blown in pink fiberglas insulation nominal bag weight 28 5 lbs. The higher the r value the greater the insulation performance.

How is insulation r value calculated. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. As a benchmark one inch of solid wood has an r value of 1.

Let s start with an example. R value bags per 1000 sq. 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. An r value is also calculated per inch of width. R value measures how well certain building insulation materials can resist heat. R value of insulation by type.

Here are the r values per inch of the most common types of insulation. When determining how much insulation you need don t guesstimate calculate. Input length width and desired r value of the area to be insulated.

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