Open cell is a type of foam in which the tiny cells that comprise it are not completely closed. It is typically less expensive because it uses fewer chemicals. While it is not recommended for outdoor applications, it can provide insulation in 2×6 walls and attics and sound reduction in interior walls during new home construction or renovations.
Open cell spray foam will not shrink or settle and offers:
Closed cell foam insulation is denser, because the cells contain less air and are more compact. Because it is structural in nature, it can be used anywhere in the home—including garages and basements—adding 300 to 400% more strength to the home and acting as a substantial barrier against mold- and mildew-causing moisture in finished basements.
Closed cell foam is ideal for masonry and 2 x 4 or 2 x 6 framing and metal buildings. It won’t shrink or settle and offers: