JACKSONVILLE Blog

Differences Between Closed-Cell and Open-Cell Foam Insulation

Spray foam insulation is frequently used for residential and commercial jobs. Two types exist: open-cell and closed-cell spray foam. Both are highly effective at keeping buildings warm and secure, but they each have unique strengths and weaknesses. This guide describes the differences between the two so that you can select the best choice for your project. 

About the Two Insulation Types

Open-cell foam contains cells, or small compartments, that are not fully encapsulated. Parts of the cell are left open so that the overall material is lighter, thinner, and more flexible. Closed-cell foam, on the other hand, is made of cells that are fully closed. This results in a more rigid, thick material since moisture and air can't penetrate the little compartments. 

How They Differ

R-Value

The R-value of spray foam insulation is a measurement of the material's resistance to heat flow. Closed-cell foam has a higher R-value per inch than the open-cell alternative since the cells don't allow for air, moisture, or anything else to pass through. The higher the rating, the more effective the insulation. Since open-cell foam tends to have a slightly lower R-value per inch, it's commonly used in roof deck and applied at a thicker depth. 

Expansion

Closed-cell foam expands by about 1 inch as soon as it is sprayed. You can apply multiple layers of this insulation to achieve your desired R-value. Typically, you would use 2-3inches of foam thickness in most applications. Open-cell insulation also expands, but at a much more dramatic rate than closed-cell. Therefore, you only apply one 3-6inch layer in most cases. 

Benefits of Each

Open- and closed-cell spray foams have specific benefits depending on your needs. Closed is ideal for areas with dramatic temperature differences and moisture concerns need to be addressed since it effectively keeps out the cold and helps regulate the temperature of your home as well as being a moisture barrier. Since it's rigid, it also lends sturdiness and support to walls where it is applied. 

Open-cell foam expands dramatically, so it can fill most spaces quickly. It's also an ideal choice for soundproofing since it fits easily into small areas. Applied at a thicker layer it can be used in roof decks and walls where a moisture barrier has already been applied

If you need help with an insulation project, turn to Koala Insulation of Jacksonville in St. Augustine, FL. With more than 15 years of experience, this contractor has helped hundreds of homeowners with their insulation needs. They use a variety of materials and methods to ensure that homes are properly insulated, including spray foam insulation. Learn more about their services online, and schedule a consultation by calling (904) 679-6282.