The 6-foot rule
In construction, OSHA requires fall protection at any height of 6 feet or more above a lower level (general industry is 4 feet). That covers:
- Unprotected sides and edges.
- Leading edges where you're building the floor or roof out.
- Holes in floors and roofs, and openings in walls.
- Roofs, ramps, runways, and elevated platforms.
- Work above dangerous equipment, at any height.
Below 6 feet you can still get badly hurt — the rule is a floor, not a guarantee.