To maximize the overhead space in their facilities, many operations utilize elevated work platforms, pick modules, or rack supported platforms upon which workers access stored items. Because they’re working above ground level, it’s important to integrate permanent fall protection—specifically guardrails—around the perimeter of the platform or walkway to prevent those associates from falling over the edge.

ANSI Publications Weigh in on Guardrails

Guidelines for the safe design of guardrails are in two separate ANSI publications:

Both specifications note that guardrails must consist of a top rail, an intermediate rail and posts. The horizontal top rail must be at a minimum height of 42 inches above the floor surface. Further, intermediate rails must be designed to prevent a 21-inch-diameter sphere from passing through any opening. For additional safety, the entire guardrail assembly must be designed to separately resist the force of a concentrated live load of 200 pounds, or a distributed live load of 20 pounds-per-foot.

Guardrails Versus Handrails

It’s also important to note the difference between a guardrail and a handrail—two terms that are not interchangeable. Guardrails provide fall protection. Conversely, handrails on stairways provide additional stability to persons ascending or descending from one level to another. Handrails can also serve as the top of guarding. In this case, their position must be between 34 inches and 38 inches from the tread surface. They must also prevent a 21-inch-diameter sphere from passing through any opening.

Find More Ways to Protect Workers at Heights

Want to learn more about the design requirements that ensure worker safety on elevated work platforms? The RMI/SMA ANSI MH32.1: Stairs, Ladders, and Open-Edge Guards for Use with Material Handling Structures specification can be downloaded here.