ADA 101 – Extended Floor or Ground Surface
2010 ADAS 405.9.1 Extended Floor or Ground Surface
The floor or ground surface of the ramp run or landing shall extend 12 inches minimum beyond the inside face of a handrail complying with 505.
Code according to 2010 ADAS. Check your state’s accessibility laws. Some states such as California, Georgia and Florida have additional requirements and standards.