Architectural · G-CCRGH

Stair Tread Acceptable Nosings and Warning Striping

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Stair tread nosing profiles and warning striping dimensions are detailed for four configurations including flush riser, angled nosing, round nosing, and striping. The flush riser shows an eleven-inch minimum tread depth, seven-inch maximum riser height, and a half-inch maximum radius at the nosing with a thirty-degree maximum slope. The angled nosing features an eleven-inch minimum tread depth, seven-inch maximum riser height, and a sixty-degree radius with a one-and-a-quarter-inch maximum projection. The round nosing details an eleven-inch minimum tread depth, seven-inch maximum riser height, and a one-and-a-quarter-inch maximum projection with a smooth radius. The striping configuration establishes a two-inch minimum strip width located one-inch maximum from the edge of the tread, with handrail and guardrail heights ranging from twenty-seven inches minimum to thirty-eight inches maximum.

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