What is the density of closed cell spray foam insulation?

Closed cell spray foam insulation typically has a density range of about 1.5 to 3.0 pounds per cubic foot. The correct answer, 2 pounds, reflects the standard for many formulations of closed cell foam that strike a balance between thermal resistance, structural integrity, and moisture resistance.

Closed cell spray foam is recognized for its higher density compared to open cell foam, which allows it to provide superior insulation properties while also acting as a vapor barrier. This characteristic makes it particularly effective in applications where moisture control is a priority, such as in basements or exterior walls.

Lower density options, such as those at ½ pound or 1 pound, are more common with open cell foam, which does not provide the same level of insulation or moisture resistance as closed cell foam. Thus, the higher density of 2 pounds is aligned with the functional advantages that closed cell spray foam provides in terms of energy efficiency and durability.