What is the minimum height for guardrails on elevated surfaces?

The minimum height for guardrails on elevated surfaces is 42 inches. This standard is set to ensure safety by providing adequate protection against falls from heights. When guardrails are 42 inches tall, it significantly minimizes the risk of a person accidentally falling over the edge, which is particularly important in residential and commercial construction environments where workers and occupants may be at risk.

The height of 42 inches is generally recognized in various building codes and safety regulations, aiming for a balance between providing enough protection while still allowing for visibility and ease of movement. This height is especially relevant in areas such as balconies, decks, and rooftops, where the potential for falls can be serious.

The other options, while related to safety regulations, do not meet the established minimum height requirement necessary to effectively protect individuals from falling from elevated surfaces. Lower heights would not provide sufficient barrier, increasing the likelihood of serious accidents.