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

When using an extension ladder to access a rooftop unit, it is essential for safety that the top of the ladder extends at least 3 feet beyond the support point, such as the edge of the roof. This extension provides a secure handhold as you transition from the ladder to the roof, reducing the risk of slips or falls.

The 3-foot extension is a standard guideline recommended by safety organizations, ensuring that workers have enough grip on the ladder when climbing on or off the roof. It facilitates safer operation, as being able to hold onto the ladder while stepping onto the roof helps maintain balance and stability. This detail is especially important because rooftop units can be located in various and sometimes precarious environments, making secure ladder use critical for the safety of the technician.