Massachusetts Construction Supervisor License (CSL) Practice Test

What is the proper horizontal spacing of a ladder placed vertical to a wall?

1. 2 feet horizontal for every 5 feet vertical

2. 1 foot horizontal for every 4 feet vertical

3. 3 feet horizontal for every 6 feet vertical

4. 1.5 feet horizontal for every 5 feet vertical

The correct answer is: 1 foot horizontal for every 4 feet vertical

The correct spacing for a ladder placed vertically against a wall is based on ensuring stability and safety for the ladder user. The guideline that specifies a horizontal spacing of 1 foot for every 4 feet of vertical height is designed to create an optimal angle between the ladder and the ground. This 4:1 ratio is crucial because it helps to prevent the base of the ladder from being too far from the wall, which could cause the ladder to become unstable and possibly tip over when a person climbs it. When following this guideline, it promotes a safe climbing angle, usually around 75 degrees from the ground, which is not only safer for the user but also conforms to best practices in ladder safety. Other options suggest different ratios that do not align with these safety guidelines. For example, a 3:5 ratio or a 1.5:5 ratio would lead to an angle that can result in either too steep an ascent or increased risk of ladder failure. Maintaining the proper spacing ensures that the ladder is secure and that the user can safely operate at height.