When using an extension ladder to work on a rooftop unit, how far should it extend beyond the support point?

When using an extension ladder to access a rooftop unit, it is essential for the ladder to extend beyond the support point by at least 3 feet. This extension provides the necessary stability and a safe handhold when transitioning from the ladder to the rooftop. By having the ladder extend this distance, it helps ensure that the worker can securely grip the ladder while stepping on or off, reducing the risk of slipping or falling.

Extending only 1 or 2 feet may not provide adequate support or safety for the user during this transition, while 4 feet would be more than what is typically recommended, potentially leading to issues such as the ladder being overly unwieldy or more difficult to position effectively. Thus, the standard recommendation for safety in ladder use, especially in situations requiring access to elevated areas, is to extend the ladder 3 feet beyond the support point.