Blown Fiberglass Attic Insulation R Value
One bag of attic protector provides 62 square feet of r 30 coverage.
Blown fiberglass attic insulation r value. For example roll insulation suitable for 2 4 wall and ceiling cavities is about 0 35 to 0 40 per square foot. Know exactly how much you need with our project calculators. 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. When determining how much insulation you need don t guesstimate calculate.
The higher the r value the greater the insulation performance. Existing 3 4 inches of insulation. Fiberglass batt insulation is priced by the roll or by the square foot. 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. R value of insulation by type. You d need a thickness of. Closed cell spray foam insulation cost is 1 25 2 00 per board foot for the material diy.
R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. 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. Add insulation to attic. Johns manville attic protector formaldehyde free premium blow in fiberglass insulation offers effective thermal and acoustical performance.
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. As a benchmark one inch of solid wood has an r value of 1. 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.
Here are the r values per inch of the most common types of insulation. Recommended insulation levels for retrofitting existing wood framed buildings. R value measures how well certain building insulation materials can resist heat. Input depth of existing blown in insulation in inches.