Means of Egress · IBC 2021 §1011.10
Spiral Stairway Dimensions
Spiral stair plan and section to scale: 6 3/4" clear tread at 12" from the narrow edge, 9 1/2" maximum riser, 78" headroom, 26" clear width, and where egress use is allowed.. Referenced to IBC 2021 §1011.10.
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