What is the desired angle for the heel or base of the ladder to ensure a proper climbing angle?

The desired angle for the heel or base of a ladder to ensure a proper climbing angle is 75 degrees. This angle is recommended because it provides a balance between stability and reach. At 75 degrees, the ladder is steep enough to allow for easy climbing while also being stable and preventing the base from slipping or the top from tipping over.

Using this angle supports safer climbing practices, as it lowers the risk of accidents due to the ladder slipping or the climber losing balance. It also ensures that the ladder can be easily manipulated into position, enhancing firefighter efficiency while maintaining safety protocols on the scene.

Other angles, such as 60 degrees or 45 degrees, do not provide the optimal combination of stability and ease of ascent. A 90-degree angle, where the ladder is vertical, is not practical for climbing as it offers no support for the climber and significantly increases the risk of falls.