Handrail extensions at stair runs showing top and bottom clearance requirements per California Building Code sections 11B-505.10.2 and 11B-505.10.3. The top handrail extension features a minimum twelve-inch horizontal extension past the top riser. The bottom handrail extension includes a horizontal extension equal to twelve inches plus one tread depth minimum beyond the bottom riser, with dimension X representing the tread depth.
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