Blown Attic Insulation R Value Per Inch

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

Blown attic insulation r value per inch.

Click the button to calculate the approximate r value for this job. 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. Click the button to calculate the depth in inches and pounds of total insulation required for this job. R value of insulation by type.

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. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Atticat expanding blown in pink fiberglas insulation nominal bag weight 28 5 lbs. As a benchmark one inch of solid wood has an r value of 1.

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. As you can see there s some variation in r value depending on the particular type and brand of products used. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. R value measures how well certain building insulation materials can resist heat.

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

R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Here are the r values per inch of the most common types of insulation. Let s start with an example. How is insulation r value calculated.

Solid wood has an r value of 1. R value bags per 1000 sq. Maximum net coverage sq. Input length width and desired r value of the area to be insulated.

Achieving the desired r value depends on both the depth of the insulation and its density. The higher the r value the greater the insulation performance. The total r value of installed insulation is.