Open-Cell or Closed-Cell Spray Foam?
Closed-Cell Spray Foam
The bubbles or cells in closed-cell spray foam are closed and tightly packed together. This makes closed-cell spray foam much denser and stronger than open-cell spray foam. It will not absorb water or allow air to pass through it. This is because the bubbles in closed-cell foam are filled with a gas making them much smaller and a better insulator. Closed-cell spray foam tops the charts in insulating power with an impressive average of R-7 per inch.
