Accufoams 2.8 lb. Roof Foam HFO Closed-Cell Regular Spray Foam Insulation bonds seamlessly to a variety of surfaces, including metal, wood, and concrete. As the foam expands upon application, it fills gaps and cracks, ensuring complete coverage and minimizing the potential for leaks. This spray foam not only enhances the structural integrity of the roof but also contributes to long-term performance by offering resistance to water damage and mold growth. Its an eco-friendly and effective solution for maximizing roof insulation.