Closed-cell SPF has an R-value of around 6.0 per inch (aged R-value) and uses high R-value blowing agents.īoth types of foam are commonly used in most building applications and the choice for which to use can depend on many of the factors discussed above. Open-cell SPF has an R-value around 3.5 per inch and typically uses water as the blowing agent. The choice of foam can also be based on the requirements for the other performance or application specific characteristics such as strength, vapor control, available space, etc. Even though it has a better R-value, typically the cost per R is still higher than open-cell foam. The disadvantage of the closed-cell foam is that it is denser, requires more material, and therefore, is more expensive. The advantages of closed-cell foam compared to open-cell foam include its strength, higher R-value, and its greater resistance to the leakage of air or water vapor. These “higher density” foams are typically in the 30 lb./cu. Some polyurethane foams are molded into decorative interior molding and painted or stained for a simulated wood effect. The higher the density the foam, the heavier, or stronger it becomes. Roofing applications typically use a 2.8 to 3.0+ lb./cu. Closed cell foam for insulation applications range in density from 1.7 lb./cu. Open cell foams typically weigh in at 0.4 to 0.5 lb./cu. These cells can be formulated to obtain many characteristics, the most common being size and density.ĭensity is measured by weighing one solid cubic foot of foam material.

They are filled with a gas that helps the foam rise and expand and become a greater insulator. This makes the foam weaker or softer feeling than closed-cell foam.Ĭlosed-cell foam differs in that all of its tiny foam cells are closed and packed together. They are broken and air fills all of the “open” space inside the material. It is either open-cell foam, where the tiny cells of the foam are not completely closed. closed-cell issue, there are two major factors to understand and consider. This makes a big difference in cost, application methods, and performance. When it comes time to actually put the foam product in your home or commercial building structure, you must identify whether you will use. This may be one of the most important pages on the website if your interest is in spray foam insulation. What is the difference between closed cell and open cell?

Does closed cell foam absorb water