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U.S. ACCESS BOARD TECHNICAL GUIDE Stairways

Requirements for stairways address treads and risers, surfaces, nosings, and handrails. All steps on a flight must have uniform riser heights Tread surfaces must comply with Treads and Risers (§504.2 and §504.3) within a range of 4” – 7” and uniform tread depths that are 11” min. Open risers are prohibited. .

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  Trade, Riser, Treads and risers

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