OSHA Requirements 1926.454 Employees who perform work while on a scaffold must be trained to recognize the hazards associated with the type of scaffold being used and to understand the procedures to control or minimize those hazards. A scaffold is defined as any temporary elevated work platform (supported or suspended) and its supporting structure used for supporting employees, materials or both. Scaffolds history takes us back to Ancient Egypt where some of the most marvelous structures were erected such as the pyramids and statues. Early scaffolding was made of wood and secured with rope knots. In the 20th century we use metal tubes made from steel and aluminum. The main difference between the two is that steel tubes weight is about three times more than aluminum.