Construction Supervisor License Practice Exam

What is the typical angle for setting a extension ladder against a wall?

1. 60°

2. 75°

3. 45°

4. 90°

The correct answer is: 75°

The typical angle for setting an extension ladder against a wall is 75 degrees. This angle is considered optimal for safety and stability when using the ladder. Setting the ladder at this angle helps ensure that the ladder is neither too steep, which could increase the risk of slipping or falling, nor too shallow, which could lead to the ladder tipping backward. A 75-degree angle strikes a balance, providing a secure base while allowing for easy access to the upper rungs. It is generally recommended to position the base of the ladder one foot away from the wall for every four feet of height, which aligns closely with the 75-degree guideline. This safe positioning allows users to maintain proper balance and control while ascending or descending, significantly reducing the risk of accidents. Angles such as 60 degrees or 45 degrees would not offer the same level of safety, as they either create a steeper incline or increase the likelihood of the ladder tipping. A 90-degree angle would place the ladder directly against the wall, which is not practical for safe use, as it does not provide any angle for stability and makes climbing more challenging. Therefore, setting an extension ladder at 75 degrees is the recommended and safest practice.