Accessibility requirements for vertical clearance beneath open staircases comply with California Building Code standards. A guardrail or other barrier is required where the underside of the stair slopes to a vertical clearance of less than eighty inches above the finished floor. The barrier prevents circulation into spaces where headroom is restricted, maintaining a maximum twenty-seven inch height limitation for protruding objects. Additional details show acceptable vertical change in level dimensions and bevel configurations for walking surfaces.
1 /4 " 1 /4 " 1 /2 " 1/4" MAX 1 2 11B-303.3 11B-303.2 27" MAX X < 80" CBC 11B-307.4 GUARDRAIL OR OTHER BARRIER
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