When researching insulation products, you will most likely come across the term “R-value” a lot. R-value is the rating given to insulation products that tells the consumer just how well that product insulates against heat flow. A product with a higher R-value is a better insulator than one with a low R-value. The higher R-value also indicates a slower heat loss rate.
When you think about the wall of a house or building, imagine the exterior as brick and the interior as drywall. The space in between these two surfaces is where the insulation is applied. Even though bricks are dense, hard, and connected by mortar, there are teeny, tiny cracks, gaps, and holes that allow air to flow through. The same goes for wood and drywall. Air can penetrate these surfaces fairly easily. This is why using a high R-value insulation product, such as spray foam insulation, is so important.
Spray foam insulation has an R-value of about 6.5, as compared to cellulose and fiberglass at about 3.6. Using spray foam insulation will help your house retain heat during the winter months and keep the heat out during the hot summers much better and more efficiently than other types of insulators with lower R-values. And remember those tiny holes discussed above? Spray foam insulation has the unique ability to spread and expand when it is first applied (since it is in a liquid state) to find and fill in those tiny holes.