Insulation R-Value

r values for different insulation types

What is R-Value?

R stands for Resistance. R-Value is used to measure the effectiveness of insulation by measuring the Resistance to the passage of heat through the walls and ceilings of a home.

Why Foam Insulation?

In the graph above, you will see that Tripolymer® Injection foam and Spray Foam (open and closed cell) have the highest R-Values.

We can apply Spray foam to open areas, such as attic rafters, open wall cavities (before sheetrock), basement and crawl space ceilings and rim joists.  Tripolymer injection foam insulation can be applied to existing wall cavities from the exterior of your home.  With Tripolymer, the R-value is higher than traditional insulation products like fiberglass and cellulose, because it fills more of your wall cavity and has a higher density than the other products. When you buy Spray Foam or Injection Foam, you are buying a higher R-Value, which means you are getting better insulation!

How Much Better?

For Existing Walls:  Installed in a standard existing 2″ X 4″ wood framed wall (3 1/2 ” of cavity), Tripolymer® Injection Wall Foam will provide an R-value of approximately 18, which is 34% higher than what can be achieved with cellulose and fiberglass! This is a significant difference and is important to attaining an energy efficient home. Another important difference is that unlike cellulose and fiberglass, Tripolymer® Injection Wall Foam will not settle over time so will maintain its insulation value. Learn more about Tripolymer® and our unique installation process to see how it can be applied in your home.

For Attics & Basements as well as New Construction Walls: Spray Foam insulation will provide you with the highest R-Values and air sealing capabilities. Fiberglass batts have an R-Value of about 3.5 per inch, but they do not air seal. Spray foam provides a permanent barrier to air flow and heat loss. Spray Foam products, depending on the open or closed cell composition, range from about 4.0 per inch to over 6.0 per inch.  Visit our Spray Foam Insulation Products  and Spray Foam FAQs to compare R-Values for some of the open and closed cell Spray Foam insulation brands we use and where they would be typically applied in your home.


According to the U.S. Department of Energy, 80% of the homes built before 1980 are not considered well insulated. Many of these homes have no little or no insulation, since building codes did not require minimum insulation at that time. Because of our installation process, if you have an existing home with little or no insulation or even if you have underperforming insulation in your walls today, you can dramatically improve your home’s R-Value without tearing down existing wall structures or undertaking major home remodeling projects.

The following map shows the U.S. Department of Energy’s minimum recommended* R-Values for newly constructed wood framed homes in various climates.

Home Insulation R-Value | Fairfield County | Westchester County Home Insulation R-Value CT | New Haven County

*These recommendations are based on the best available information on local fuel and materials costs, and weather conditions. Consequently, the levels may differ from current local building codes.