What technique should be applied when placing a ladder for use on a roof?

The recommended technique for placing a ladder for roof access is to ensure it is raised to a 75-degree angle. This specific angle provides the best stability and safety when using a ladder. At a 75-degree angle, the ladder is inclined enough to allow for a secure climb while also being steep enough to provide a grip and support against the structure it is leaning against.

Using this angle minimizes the risk of the ladder slipping or falling over, making it critical for the safety of the person using it. Properly positioning the ladder in this way allows for easier access to the roof and ensures that the climber maintains a stable footing throughout the ascent and descent.

In cases where a ladder is placed flat against the roof, it can lead to a dangerous situation where it may slide off or lack adequate support. Positioning it at a steep angle could compromise stability and increase the risk of accidents. Leaning the ladder at an angle that follows the pitch of the roof might not provide the necessary support or stability required to safely climb, as it could lead to misalignment and potential hazards during use.