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| Requirement | Typical Value | |------------------------------|-----------------------------------------| | Minimum live load | 1.5 kN/m² (residential) / 3.0 kN/m² (public) | | Tread depth (nosing to nosing) | ≥ 10 inches (254 mm) | | Riser height uniformity | ≤ 3/16″ variation | | Handrail requirement | If >3 risers, one handrail required | | Guardrail (open side) | 42″ minimum height (USA) |