Baylor College of Medicine Research Tower
We were annoyingly (and contractually) adamant that we were not responsible for protection after delivery. We productively reminded the GC that putting these treads into what was still a construction site (albeit under roof) was a recipe for staining, dirtying, and chipping the treads. They laid masonite or similar covering over every tread and avoided a good-sized problem.
This photo is also available in a larger resolution.