What is the typical R-value of closed cell spray foam insulation per inch?

Closed cell spray foam insulation is known for its high insulating properties and is typically rated at around R-6 per inch. This high R-value is due to the structure of the foam, which is composed of cells that are closed and filled with a gas, providing both thermal resistance and air sealing capabilities. This makes closed cell spray foam an excellent choice for areas where moisture resistance and thermal performance are critical, such as in walls, roofs, and any application requiring an effective air barrier.

The R-value rating reflects its effectiveness in reducing heat transfer; a higher R-value indicates better insulation performance. Closed cell foam's ability to achieve around R-6 per inch makes it highly efficient compared to other types of insulation, making it suitable for energy-efficient building designs. This efficiency, combined with its structural benefits, reinforces its popularity in modern construction and renovation projects.