Spray foam insulation is a good choice to consider when you need more insulation in your attic and exterior walls. A contractor sprays the foam on and it rolls into cracks and gaps as it hardens. This makes it an effective way to seal your home, as well as add insulation. There are two types of spray foam insulation to choose from: open cell and closed cell. Closed-cell spray foam is often a good choice. Here's why.
Closed-Cell Spray Foam Has A Higher R-Value
R-value is the measurement of how well insulation blocks the transfer of heat. The higher the value, the better the insulation keeps heat indoors in the winter and blocks heat from coming inside during the summer.
The R-value of closed-cell spray foam is greater than that of open-cell foam. Both types of insulation can have their R-value increased by adding more layers. However, when the insulation is sprayed out, open-cell foam expands a lot more than closed-cell foam, so you can't apply as many layers of open-cell foam in a closed space, like between walls. This widens the gap even further between the two types of spray foam insulation when it comes to R-value.
Closed-Cell Spray Foam Acts As A Vapor Barrier
Closed-cell foam has another advantage, in that it not only blocks airflow better, it also blocks water vapor. This is an important feature when you apply insulation to an exterior wall. The foam helps keep water vapor and moisture from getting inside your house and creating problems with mold and decay. Closed-cell insulation doesn't soak up water very well, and that keeps it free from mold, rot, and other damage that can afflict other types of insulation.
Closed-Cell Foam Is Dense
The denseness of closed-cell foam makes it a good choice for cold climates. The way the foam is made allows the cells to be packed close together. This makes the material dense once it hardens. It is much denser and heavier than other insulation, including open-cell foam. This makes it a good choice for areas that need superior insulation due to extremely cold temperatures in the winter because it is so effective at blocking airflow and leaks.
Closed-cell spray foam has advantages, but the insulation costs more than open-cell foam. When choosing the best insulation for your needs, whether it's for your walls, crawlspace, or attic, talk to an insulation contractor for advice. You need insulation that matches your climate, fits in with your budget, and is suitable for the moisture threats in the space you intend to use it.