Is walking over a metal roof likely to cause any damage?
Not if you walk between the ribs when the roof is dry. One big benefit to metal roofing in terms of walkability is that it retains its impact resistance as it ages. After other roofing materials age a few years, they can be damaged by walking on them, but that is not the case with metal roofing. It will resist foot traffic, hail, etc. the same in 30 years or more as it does when it is new.
