How many feet should extension ladders reach above a working surface?

When using extension ladders, it is important for safety that they extend at least three feet above the working surface. This extension provides a secure handhold for individuals as they step on or off the ladder, thereby reducing the risk of falls. The three-foot extension offers adequate stability and ensures that the ladder remains secured and upright, even as the user transitions from the ladder to the structure or vice versa. This safety measure is critical, particularly in professional settings where workers often perform tasks at height, and thus adhering to this standard is essential for accident prevention.