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ABA Accessibility Standard for GSA Facilities Pocket Guide

405.9.1 Extended Floor or Ground Surface.

The floor or ground surface of the ramp run or landing shall extend 12 inches (305 mm) minimum beyond the inside face of a handrail complying with 505.

Advisory 405.9.1 Extended Floor or Ground Surface. The extended surface prevents wheelchair casters and crutch tips from slipping off the ramp surface.
The cross section of a ramp with handrails is shown where the ramp surface extends 12 inches (305 mm) minimum to the outside of the handrails.

Figure 405.9.1 Extended Floor or Ground Surface Edge Protection 

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