What is the correct angle of inclination for single and extension ladders?

The correct angle of inclination for single and extension ladders is 75 degrees. This angle is essential for maintaining both safety and stability while using a ladder. At this inclination, the ladder provides an optimal balance, allowing for a secure grip on the rungs while minimizing the risk of slipping or tipping over.

A 75-degree angle ensures that the base of the ladder is positioned far enough from the wall or structure it leans against, which is crucial for employing proper leverage and weight distribution. When the ladder is set at this angle, the weight is distributed evenly along the ladder, reducing the chances of it sliding out at the base or slipping at the top.

Angles that are too steep or too shallow can increase the risk of accidents. For example, a 90-degree angle would mean the ladder is vertical and not resting against any surface, which is unstable and unsafe for climbing. Similarly, a 45-degree angle is not steep enough and could lead to a greater risk of the ladder tipping over. Therefore, 75 degrees is recommended as the safest and most effective angle for ladder use, promoting both stability and ease of access while working at heights.