ADAS 2010 307.4 – Vertical Clearance
Vertical clearance shall be 80 inches high minimum. Guardrails or other barriers shall be provided where the vertical clearance is less than 80 inches high. The leading edge of such guardrail or barrier shall be located 27 inches maximum above the finish floor or ground.
EXCEPTION: Door closers and door stops shall be permitted to be 78 inches minimum above the finish floor or ground.
Code according to 2010 ADAS. Check your state’s accessibility laws. Some states such as California, Georgia and Florida have additional requirements and standards.