MBCI Eco-ficient� Roofing Panels: Can one roofing panel do it all? These can do it all. These metal roofing panels have high R-values, and qualify as continuous insulation where required by the IECC. They are designed to mitigate thermal drift and their R-values are billed as consistent for 20 years. Green roofers can look forward to working with these roofing panels.