When dealing with complex roofing projects in downtown Asheville, especially on buildings with multiple penetrations and skylights, it's important to choose materials and methods that enhance longevity and weather resistance. In my experience, TPO (Thermoplastic Olefin) roofing stands out for its high reflectivity and heat-welded seams, making it an excellent choice for urban settings with limited access. One effective approach is keeping part of the existing insulation, such as the bottom layer of polyiso, and adding a new insulating layer. This layered insulation method improves thermal performance while controlling project cost and minimizing waste. In addition, mechanically attaching the 60mil TPO membrane ensures a secure fit, reducing the likelihood of issues related to wind uplift or membrane movement. I also found that careful removal of the existing membrane and top layer of polyiso is essential to provide a smooth substrate for the new roof system. This process not only helps in tackling any hidden damage but promotes better adherence of the new materials. For those in Asheville or similar climates, consider consulting with roofing experts familiar with local weather patterns and structural challenges. Their insights can guide you in selecting the best roofing solutions that balance durability, energy efficiency, and aesthetics. This method of roofing restoration can extend the life of your building envelope while enhancing comfort inside.