A recent MCA study of the service life of unpainted 55%Al-Zn low slope standing seam roofing has had an impact on the Athena Sustainable Materials Institute.  The report served as the technical substantiation for Athena to change the useful service life of this type of roofing product to 60 years!  Athena’s software allows for whole building LCA assessment, taking into account all materials, systems, assemblies and components used in a given type of building.