Blown Attic Insulation R Value Per Inch

R value of insulation by type.
Blown attic insulation r value per inch. Let s start with an example. Know exactly how much you need with our project calculators. R value bags per 1000 sq. An r value is also calculated per inch of width.
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. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Solid wood has an r value of 1. 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. 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. How is insulation r value calculated. Atticat expanding blown in pink fiberglas insulation nominal bag weight 28 5 lbs.
Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. The higher the r value the greater the insulation performance. R value measures how well certain building insulation materials can resist heat. Therefore a three inch thick board has an r value of 3.
The total r value of installed insulation is. Input depth of existing blown in insulation in inches. 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. 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. This calculator is to be used as an estimating tool only.
This calculator is to be used as an estimating tool only. Maximum net coverage sq. Click the button to calculate the depth in inches and pounds of total insulation required for this job.