Blown Attic Insulation R Value Per Inch
As a benchmark one inch of solid wood has an r value of 1.
Blown attic insulation r value per inch. The higher the r value the greater the insulation performance. How is insulation r value calculated. Let s start with an example. As you can see there s some variation in r value depending on the particular type and brand of products used.
The total r value of installed insulation is. Know exactly how much you need with our project calculators. This calculator is to be used as an estimating tool only. Achieving the desired r value depends on both the depth of the insulation and its density.
Atticat expanding blown in pink fiberglas insulation nominal bag weight 28 5 lbs. Click the button to calculate the depth in inches and pounds of total insulation required 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. 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.
Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. Solid wood has an r value of 1. This calculator is to be used as an estimating tool only. When determining how much insulation you need don t guesstimate calculate.
An r value is also calculated per inch of width. R value bags per 1000 sq. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Input length width and desired r value of the area to be insulated.
Here are the r values per inch of the most common types of insulation. 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. Therefore a three inch thick board has an r value of 3. R value of insulation by type.
R value measures how well certain building insulation materials can resist heat. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Input depth of existing blown in insulation in inches.