Blown In Fiberglass Attic Insulation R Values

This calculator is to be used as an estimating tool only.

Blown in fiberglass attic insulation r values.

You can use the small pressurized cans of foam. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Recommended home insulation r values. Click the button to calculate the depth in inches and pounds of total insulation required for this job.

Input depth of existing blown in insulation in inches. Input length width and desired r value of the area to be insulated. Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage. The higher the r value the better the thermal performance of the insulation.

Achieving greater r values in exterior walls. R value is a measure of insulation s ability to resist heat traveling through it. Fiber glass insulation typically contains 20 to 30 recycled glass1. Fiberglass installation labor cost is about 1 00 to 2 75 per square foot based on the amount of insulation and the location.

You d need a thickness of. Click the button to calculate the approximate r value for this job. There are many ways to retrofit a home with fiberglass and. 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.

As a benchmark one inch of solid wood has an r value of 1. The higher the r value the better the thermal performance of the insulation. 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. 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.

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. You can achieve better thermal performance in your attic by adding an additional layer of insulation. 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. Insulation level are specified by r value.

This calculator is to be used as an estimating tool only. The table below shows what levels of insulation are cost effective for different climates and.