What is Spray Polyurethane Foam (SPF) primarily used for in roofing?

Spray Polyurethane Foam (SPF) is primarily used in roofing as an insulating membrane due to its excellent thermal insulation properties. When applied, it expands and forms a solid, seamless layer that adheres to the roof substrate, providing a high R-value, which is essential for energy efficiency. This insulation helps regulate temperature and reduces heating and cooling costs by minimizing air leakage.

Additionally, as an insulating membrane, SPF can add structural integrity to the roofing system and can also help with water resistance when properly coated. Its ability to create a continuous barrier without seams means it effectively reduces the risk of leaks, making it a popular choice for flat and low-slope roofing applications. Therefore, its primary function aligns closely with providing insulation and contributing to the overall energy efficiency of the building.