What is the safest angle to position an extension ladder against a wall?

Positioning an extension ladder at a 75-degree angle is considered the safest because it provides optimal stability and balance. This angle allows the ladder to make adequate contact with the ground while leaning against the wall, reducing the risk of slipping or tipping over.

At this angle, the base of the ladder stands a distance from the wall that is approximately one-fourth the height of the ladder. This ratio helps ensure the ladder is secure enough for the climber to ascend and descend safely. When using a ladder at this angle, it also minimizes the strain on the climber by allowing for a more natural approach to the ladder, keeping bodyweight distributed evenly.

Ladders set at angles that are too steep, such as 90 degrees, can lead to instability because they lean too closely to the wall, increasing the risk of falling. Conversely, too shallow an angle, like 60 degrees or 45 degrees, may not provide enough elevation or may shift the center of gravity too far back, causing the ladder to tip over.