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

Open cell spray foam insulation typically has an R-value of approximately 3.7 per inch of thickness. This value indicates its effectiveness as an insulating material, which helps to reduce heat transfer and improve energy efficiency in buildings. The R-value represents the thermal resistance of the insulation; a higher R-value means better insulation performance.

Understanding the R-value is crucial for selecting the right type of insulation based on specific building needs and climate conditions. Open cell spray foam is often favored for its flexibility and ability to expand and fill gaps, providing an effective air barrier in addition to thermal insulation.