Which Type of Spray Foam is Best for Attic Insulation?

When it comes to attic insulation, there are two main types of spray foam to choose from: open-cell and closed-cell. Both types of spray foam create an air seal, but the best choice for your project will depend on the specific needs of your attic. Low-density open-cell spray foam is a two-component polyurethane foam that is applied as either low or high pressure. It is often used to fill cavities in walls during construction and is known as an air barrier, though it is permeable to vapor and moisture.

Open-cell spray foam is more flexible and softer than closed-cell spray foam because it has more space between cells, such as air bubbles or voids. Closed-cell spray foam is just the opposite, with no air or space in the cells. This stiffness makes it stronger and firmer than open-cell insulation, and it can even help to reinforce the integrity of the insulating structure. The bond that the spray foam forms with the roof can increase the building's resistance to rising wind, which can help reduce damage suffered during periods of strong wind. Closed-cell spray foam is denser and more moisture resistant, making it more suitable for outdoor applications and areas with high humidity levels. It can be more susceptible to retaining water or moisture, but it can be easier to handle and fill spaces, as it's not as stiff as a closed cell. When deciding which type of spray foam to use in your attic, you should consider the specific needs of your project.

Low-density open-cell spray foam provides thermal insulation and seals airflow through cracks, joints, and joints by filling cavities. Closed-cell spray foam can be used to fill cavities in walls during construction and can increase the building's resistance to rising wind. It is also denser and more moisture resistant, making it more suitable for outdoor applications. It's important to keep in mind that both types of spray foam work to create an airtight seal and prevent moisture infiltration, making them valuable insulation options. However, if you're worried about potential water damage due to spray foam insulation, make sure you consult a professional before beginning your project.