Blown In Fiberglass Attic Insulation R Values

Recommended home insulation r values.

Blown in fiberglass attic insulation r values.

Where you live different climates require different insulation r values. The higher the r value the better the thermal performance of the insulation. This calculator is to be used as an estimating tool only. Spray foam insulation for both types starts at about 1 50 per square foot and can cost more than 5 00 per square foot when a thick application is applied.

Your home s age if your home is more than 10 year old you likely need more insulation. As a benchmark one inch of solid wood has an r value of 1. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Insulation level are specified by r value.

Fiberglass insulation is the same type of material that is in batts or rolls of fiberglass insulation except it is chopped or cubed so that it can be installed with an insulation blowing machine. The table below shows what levels of insulation are cost effective for different climates and. Some installations can yield a higher r value than traditional batt insulation for the same thickness and can fill even the smallest cavities creating an effective air barrier. Fiberglass installation labor cost is about 1 00 to 2 75 per square foot based on the amount of insulation and the location.

Input length width and desired r value of the area to be insulated. The higher the r value the better the thermal performance of the insulation. Click the button to calculate the approximate r value for this job. Fiber glass insulation typically contains 20 to 30 recycled glass1.

You can use the small pressurized cans of foam. Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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. Achieving greater r values in exterior walls.

R value is a measure of insulation s ability to resist heat traveling through it. This calculator is to be used as an estimating tool only. You d need a thickness of. 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 along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage.