What is closed cell spray foam?

Closed cell foam insulation utilizes chemical blowing agents in a liquid form. The gasses these chemicals produce will expand, much like they do in open cell foam, but they expand slower and the plastic sets before the bubbles start to explode. This results in a spray foam that is denser and more impermeable than open cell foam.


Pros and Cons of Closed Cell Foam

The Pros

  • Closed cell has a higher R-Value.
  • Closed cell can be installed at lower temperatures.
  • Closed cell is recommended for flood zones because it is designed to deflect bulk water.
  • Closed cell is great for both interior and exterior use.
  • Closed cell increases structural integrity by 275%.

The Cons

  • Closed cell is a little more expensive than open cell foam.
  • Closed cell is three times denser than open cell and does require more materials.

When should you choose closed cell foam over open cell foam?

Closed cell and open cell spray foam insulation both have some pros and cons, and the right one for the job will depend on the overall environment and conditions of the project at hand. Although there is a few overlaps between applications that closed cell and open cell foam can be used for, in many cases, one can be clearly more beneficial than the other. Closed cell spray can be used for many applications but not limited to the following, including:

  • Vented or non Unvented Attics
  • Interior or Exterior Walls
  • Floors with or without a Subfloor or Decking
  • Unvented or Vented Crawl Spaces
  • Concrete Slabs on Raised Homes
  • Cold Storage Units
  • Freezers
  • Duct work
  • Coolers Large or Small
  • Tanks and Silos
  • Ceilings and Roof Decking