Blown Fiberglass Attic Insulation R Value

You can use the small pressurized cans of foam.

Blown fiberglass attic insulation r value.

Considering diy blown fiberglass insulation vs spray foam both require care to get the thickness right. Insulation level are specified by r value. 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.

Recommended home insulation r values. Input length width and desired r value of the area to be insulated. Fiber glass insulation typically contains 20 to 30 recycled glass1. 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.

Home improvement stores will often rent you a machine to blow in the fiberglass. The table below shows what levels of insulation are cost effective for different climates and. The higher the r value the greater the insulation performance. This calculator is to be used as an estimating tool only.

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. Click the button to calculate the depth in inches and pounds of total insulation required for this job. This calculator is to be used as an estimating tool only. The higher the r value the better the thermal performance of the insulation.

Spray foam insulation vs fiberglass r value is about equal for open cell insulation and about double for closed cell insulation per one inch layer. Click the button to calculate the approximate r value for this job. There are many ways to retrofit a home with fiberglass and. Your home s age if your home is more than 10 year old you likely need more insulation.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Know exactly how much you need with our project calculators. Where you live different climates require different insulation r values. For example a wall with 3 fiberglass batting r value of 10 8.

Input depth of existing blown in insulation in inches. When determining how much insulation you need don t guesstimate calculate. R value measures how well certain building insulation materials can resist heat. 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.