Closed Cell Spray Foam vs Open Cell Spray Foam

The two types of spray foam insulation are open cell and closed cell.

Open Cell Foam Insulation


Open cell is a type of foam in which the tiny cells that comprise it are not completely closed. It can be more cost effective due to using less product to achieve similar R-values. It can provide excellent insulation in 2×6 walls and attics where thickness is not a constraint. Open Cell also provides excellent sound reduction.

Open cell spray foam will not shrink or settle and offers:

  • R-Values (a measure of thermal resistance) up to R-19 in 2 x 6 construction

  • A rapid expansion rate of 150 times its size in seconds

  • Great sound barrier properties

  • An impermeable air barrier

  • Vapor retarder.

  • An ideal solution for large voids, 2 x 6 or larger cavities, roof decks and cathedrals.

Closed Cell Foam Insulation


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:

  • Higher R-Values, up to R-17 in 2 x 4 construction and R-28 in 2 x 6 construction

  • Increased racking strength (up to 330-400%)

  • An excellent vapor barrier at .1 Perm (minimum 2 inches).