Spray foam insulaton in Austin
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Knowledge Topics
Open Cell vs. Closed Cell
When insulating buildings, you have a choice of two different types of spray foams: Open Cell Foam or Closed Cell Foam. In Closed Cell, the cell structure is tighter which increases its density, typically a 12” cube of Closed Cell would weigh 1.7 to 2.0 lbs. The same 12” cube of Open Cell would weigh 0.5 lbs.
Since Closed Cell is tighter, it is better at moisture permeability, vapor permeability, R – Value per inch of thickness and even adds structural strength to the building. Closed Cell expands at a rate of 30 to 1, Open Cell a ratio of 100 to 1.
Although Closed Cell has better insulating properties, it is also more expensive because it requires more spray foam to do the same square footage. It is often used when you need insulation for extreme weather, such as the winter's in Jackson Hole Wyoming, or for its structural benefits.