When using an extension ladder to access the roof of a building, how far should the top of the ladder extend above the roof edge?

The requirement for the top of the ladder to extend above the roof edge by a certain height is primarily for safety and stability when climbing off and onto the ladder. Extending the ladder by three feet above the roof edge offers sufficient support and ensures that the person using the ladder has a secure handhold when stepping onto or off the roof. This additional height allows for better balance and reduces the risk of falling.

Moreover, having this extra length provides a buffer that helps prevent the ladder from slipping or sliding back as weight is transferred from the ladder to the roof. While other measurements may seem sufficient, three feet is generally recognized as the ideal height to balance safety and practicality when working at elevations.