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Open Cell VS Closed Cell Spray Foam Insulation

If you’re looking into spray foam insulation for your home or business, you may have noticed that there are two different types on the market: open cell and closed cell. However, what may not be obvious is the difference between the two. It turns out that open cell and closed cell insulation is very different and the one you need depends on how you plan to use it and what type of performance you expect.



The biggest difference between open cell and closed cell spray foam insulation is the structure of the foam. With open cell insulation, the tiny cells that make up the foam are open. The broken cells can fill with air, making the foam weaker and softer feeling than closed cell foam.

As the name implies, closed cell foam is made up of tony closed cells packed together. The cells are filled with gas that helps them expand and increases their insulating capabilities. Closed cell insulation can be formulated to take on different characteristics like size and density.

Closed Cell Foam Insulation

Closed cell foam insulation ranges in density from 1.7lb./cu. ft. to 2.0 lb./cu. ft. For applications on the roof, 2.8 to 3.0 lb./cu. ft. foam is usually used. This supports loads better and is more durable so workers can walk on it. Sometimes spray foam insulation is even molded into decorative trimmings, then painted or stained to match the home.

Closed cell foam is stronger than open cell foam and it tends to have a higher R-value. The foam is more resistant to air or water leaks, but it is denser and requires more material to make – thus, it is more expensive.

Open Cell Foam Insulation


Open cell insulation is less dense than closed cell insulation, but it is better suited for interior projects like soundproofing and providing insulation between floors in the living area. The lighter weight of the foam and the slightly more flexible finished product makes it the best choice for insulating in small areas, around objects and more.

While both types of foam can be used in most types of building applications, the type you’ll choose will depend on a number of factors. If you have any questions regarding where spray foam should be used, the installer can help you while putting the product in place. Click on the button below to get quotes on having high-quality spray foam insulation installed in your home or business.