Which grade ladder is permissible to provide access and egress to a scaffold platform?

A single industrial grade ladder is the correct choice for providing access and egress to a scaffold platform because it meets the necessary safety standards for such use. Industrial grade ladders are specifically designed to withstand the rigors of construction environments, ensuring that they can safely support the weight and dynamic forces experienced when personnel are climbing.

When used properly, a single industrial grade ladder provides a stable and secure means of access to scaffolding without excessive bulk, which can pose hazards in tighter spaces or when navigating around scaffold structures. The other types of ladders listed may not be intended for the same purpose or might not conform to the strict regulations regarding scaffold access, as they might be designed for different applications or have different load capacities. For example, a double industrial grade ladder is generally used for providing access from both sides, which is not necessary in most scaffolding scenarios, while heavy-duty and extension grade ladders serve functions that might not align with the specific needs of scaffold access.