What is the DIfference Between Open Cell Foam And Closed Cell Foam?
There are two distinct types of spray foam insulation: open cell and closed cell. Closed cell spray foam cures into a hard, rigid state, whereas open cell foam cures with a spongy, softer texture. In terms of insulation effectiveness, closed cell spray foam has an R-value of approximately R-7 per inch, while open cell foam has an R-value of around R-4 per inch. Additionally, closed cell foam becomes an air barrier with just 1 inch of application, whereas it generally takes 3 inches of open cell foam to achieve the same air barrier effect. Another significant difference is that open cell foam is permeable to water, while closed cell foam is not. Open cell foam also offers soundproofing qualities that can help in reducing outside noise.
What type of spray foam is best for my home and what if I have a roof leak?
While every job and application can vary, we generally recommend using open cell spray foam for attic encapsulations and closed cell spray foam for basement or crawlspace encapsulations. Open cell spray foam is well-suited for attics because it allows moisture to pass through it. This means that if you have a roof leak, the water would be able to permeate the foam, making it easier to identify and address the issue. On the other hand, closed cell spray foam is not permeable to water, so we do not typically recommend it for attic applications. If a leak were to occur, closed cell foam could potentially trap moisture, leading to problems such as rot and damage to your roof.
However, there are certain situations where closed cell foam might be a suitable option along the roof-line, particularly in hurricane-prone or high-wind areas, as it can provide added structural integrity. Nonetheless, closed cell spray foam is generally more suitable for basement and crawlspace encapsulations. It creates a moisture barrier that helps prevent damp and musty air from infiltrating the conditioned space of your home, thus maintaining a more comfortable and healthy environment.
Will I save money if I insulate with spray Polyurethane foam insulation?
This is a frequently asked question about spray foam insulation. It is true that the initial cost of installing spray polyurethane foam insulation is generally higher compared to fiberglass and blown-in cellulose insulation. However, this higher upfront cost is partially offset by the long-term sustainability of spray foam insulation, as it does not degrade over time like fiberglass and cellulose.
Furthermore, opting for spray foam insulation may allow you to downsize your heating and air conditioning equipment, which can contribute to cost savings. Additionally, homes insulated with spray foam have been shown to use up to 40% less energy for heating and cooling compared to homes insulated with conventional insulation, resulting in reduced energy bills. The actual savings you experience will depend on various factors such as your lifestyle, appliances, house location, number and size of windows, and more.