Vertical clearances in walls

307.4 – Vertical Clearances

307.4 Vertical Clearance.
Vertical clearance shall be 2030 mm (80″) high minimum.  Guardrails or other barriers shall be provided where the vertical clearance is less than 80 inches (2030 mm) high.  The leading edge of such guardrail or barrier shall be located 685 mm (27″) maximum above the finish floor or ground.