Blow In Attic Insulation R Value

Fiber glass insulation typically contains 20 to 30 recycled glass1.
Blow in attic insulation r value. R value is a measure of insulation s ability to resist heat traveling through it. Recommended home insulation r values. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3.
This calculator is to be used as an estimating tool only. Input length width and desired r value of the area to be insulated. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
Achieving the desired r value depends on both the depth of the insulation and its density. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Blowing the insulation should take less than 1 5 hours and the whole job can be completed in less than 4 hours based on a 1 000 sq. The specially designed atticat machine conditions the insulation by adding millions of tiny air pockets that give the material its insulating power and energy saving r value over time.
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. However it s hard to see a home that has batt insulation that doesn t fall short. This is because it achieves nominal r value when it fills in the cavities which include the hard to reach in areas voids and gaps.
Your home s age if your home is more than 10 year old you likely need more insulation. For example a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall. The higher the r value the better the thermal performance of the insulation. The table below shows what levels of insulation are cost effective for different climates and.
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. This calculator is to be used as an estimating tool only. Blown in insulation makes it easy to earn a higher grade rating when it comes to r values. Input depth of existing blown in insulation in inches.
You can achieve better thermal performance in your attic by adding an additional layer of insulation. Insulation level are specified by r value. Achieving greater r values in exterior walls. So that it can be installed with an insulation blowing machine.
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. There are many ways to retrofit a home with fiberglass and.