The top rails of a guardrail system must be how many inches above the walking surface?

The top rails of a guardrail system are required to be positioned between 39 to 45 inches above the walking surface to provide effective protection against falls. This height range is established to ensure that the guardrail system offers adequate safety for individuals working at elevated surfaces, helping to prevent accidents and injuries. Guardrails that are too low may not serve their purpose, as they could be easily overlooked or not provide sufficient containment for individuals or materials. By adhering to this standard, safety regulations help create a secure environment in various construction or work settings.