Stair handrail extensions detail the minimum clearance and horizontal run required beyond the stair nosing. The top handrail extension requires a minimum twelve-inch horizontal run past the top riser. The bottom handrail extension requires a horizontal continuation equal to twelve inches plus one tread depth beyond the last riser face. These dimensions ensure compliance with accessibility standards for stair handrail grips.
12" MIN. 12" 12" + X MIN. X NOTE: X = TREAD DEPTH TOP HANDRAIL EXTENSION AT STAIRS BOTTOM HANDRAIL EXTENSION AT STAIRS
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