Blown Fiberglass Attic Insulation R Value

Fiberglass batt insulation is priced by the roll or by the square foot.

Blown fiberglass attic insulation r value.

The higher the r value the greater the insulation performance. Click the button to calculate the depth in inches and pounds of total insulation required for this job. As a benchmark one inch of solid wood has an r value of 1. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

For example roll insulation suitable for 2 4 wall and ceiling cavities is about 0 35 to 0 40 per square foot. Here are the r values per inch of the most common types of insulation. R value of insulation by type. Know exactly how much you need with our project calculators.

Input length width and desired r value of the area to be insulated. As you can see there s some variation in r value depending on the particular type and brand of products used. The common denominator among varieties of insulation is the r value. Closed cell spray foam insulation cost is 1 25 2 00 per board foot for the material diy.

Input depth of existing blown in insulation in inches. Recommended insulation levels for retrofitting existing wood framed buildings. When blown into attics and wall spaces loose fill fiberglass offers an average r 2 5 thermal value per inch the higher the number the greater the insulating effect. Click the button to calculate the approximate r value for this job.

Installed with a portable blowing machine it s perfect for covering hard to reach areas within attics and provides a more efficient installation for homeowners or remodeling. R value measures how well certain building insulation materials can resist heat. This calculator is to be used as an estimating tool only. One bag of attic protector provides 62 square feet of r 30 coverage.

When determining how much insulation you need don t guesstimate calculate. 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. Existing 3 4 inches of insulation. Add insulation to attic.