What safety measure is required when dropping debris more than 20 ft?

When debris is dropped from a height greater than 20 feet, an enclosed chute is a required safety measure. This is primarily to protect workers and bystanders below from falling debris, which can cause serious injuries or fatalities. Enclosed chutes direct falling materials safely to the ground, minimizing the risk of accidents and ensuring that the surrounding area remains clear.

Open chutes may not provide adequate protection from debris, as they allow materials to fall freely and may not contain the scattered debris. While safety nets are beneficial for catching falling objects, they are typically used in conjunction with other measures rather than as a primary method for managing debris from significant heights. Ladders, on the other hand, are intended for access rather than for controlling falling debris. Hence, the requirement for an enclosed chute underscores the importance of proactive safety measures in construction and demolition operations.