Spray foam insulation is an insulation and air barrier material that seals walls, floors, and ceiling cavities against air movement. Spray foam can be sprayed into an open cavity, like in new construction, attics, crawl spaces, and rim joists. It can also be used in existing homes, commercial buildings, and pole barns. As long as the cavities are open and there is access, then the spray foam can be applied. Spray foam never loses its shape. Unlike conventional insulation materials, spray foam fills cracks, gaps, and crevices on installation. It won’t compress, sag, or settle over time.
The two main types of spray foam insulation are known as closed-cell and open-cell spray foam insulation. Before installing spray foam insulation in a home or building, many people wonder what the main differences between these materials are.