1011.5 Stair Treads and Risers

Where the bottom or top riser adjoins a sloping, walkway or driveway having an established grade and serving as a landing, the bottom or top riser is permitted to be reduced along the slope to less than 4 inches (102 mm) in height, with the variation in height of the bottom or top riser not to exceed one unit vertical in 12 units horizontal (8-percent slope) ofwidth. Theor leading edges of treads at such nonuniform height risers shall have a distinctive marking stripe, different from any othermarking provided on the. The distinctive marking stripe shall be visible in descent of theand shall have a slip-resistant surface. Marking stripes shall have a width of not less than 1 inch (25 mm) but not more than 2 inches (51 mm).

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