What is a proper method for recovering with SPF on single-ply systems?

Applying SPF (Spray Polyurethane Foam) directly or with a cover board or separation layer is the proper method for recovering single-ply roofing systems. This method is advantageous because it provides insulation, helps with moisture control, and adds a seamless roofing surface that can significantly enhance the roofing system’s durability and performance.

When SPF is applied directly to the existing single-ply membrane, it creates a strong bond that can improve the system's thermal efficiency. Alternatively, using a cover board or separation layer can prevent potential issues such as adhesion problems or incompatibility with the existing materials. This additional layer helps protect the single-ply membrane and provides a uniform substrate for the SPF application.

In contrast, other approaches, such as applying SPF without additional layers or using third-party products, might not maintain the integrity of the roofing system or could lead to compatibility issues. Similarly, relying solely on traditional roofing materials may not provide the same benefits in terms of insulation and moisture management that SPF offers. Thus, integrating SPF properly can significantly improve the lifespan and performance of single-ply roofing systems when installed correctly.