What must a ladder extend above a parapet wall or landing?

The requirement for a ladder to extend above a parapet wall or landing by at least 3 feet is based on safety standards that ensure the user has a secure handhold when transitioning from the ladder to a higher surface. This extension is crucial because it provides additional leverage and stability, reducing the risk of falls as the person moves onto the roof or down from the ladder.

This specification is particularly important in situations where the user may need to reach over a barrier or edge safely, and it helps ensure that once at the top of the ladder, the individual has enough height to grasp the structure securely. Such safety regulations are part of broader guidelines aimed at preventing workplace injuries and promoting safe practices when using ladders in construction and maintenance work.