What is the long-term R-value of Polyisocyanurate and polyurethane insulation per inch?

The long-term R-value of Polyisocyanurate and polyurethane insulation is typically around R-6 per inch. This value reflects the insulation's ability to resist heat flow, which is crucial for energy efficiency in buildings. Polyisocyanurate is known for its high thermal resistance, making it an excellent choice for low-slope roofing and exterior wall applications. Its R-value can vary slightly based on the specific product formulation and manufacturing process, but R-6 is a standard reference point for these materials.

Understanding R-value is important for assessing insulation performance; a higher R-value indicates better insulating effectiveness. For builders and architects, choosing materials with higher R-values is essential to meet energy codes and to enhance the overall energy efficiency of a structure. The specified R-value helps in calculating the overall thermal performance of insulation systems and can influence decisions on materials based on budget and performance criteria.