Trim
Mueller makes trim for metal roofs and walls that protects the building and finishes the job cleanly. Trim covers the seams, edges and transitions where water wants to get in, and it gives the roof and walls a straight, deliberate line where two planes meet.
The right profile depends on the panel system on your building. Sizes, colors and stock vary by location, so your local Mueller store can confirm what they carry and what they can order for your project.