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411.2.1 Tread Dimensions and Area
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Treads shall be not less than 24 inches (607 mm) at the leading edge. Treads shall have an unobstructed surface area of not less than 240 square inches (0.154 m2) and an unobstructed horizontal depth of not less than 10 inches (254 mm) at the centerline.
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Related Code Sections
411.2.1 Public Swimming Pools, Tread Dimensions and Area
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