Scaffolds that have been erected or altered by persons who have not received the necessary training are likely to be dangerous and unsafe.

Scaffold must only be erected, altered or dismantled under the strict supervision of a person who has received the necessary training as well as being competent and experienced.

The prime reason for erecting a scaffold is to provide a platform for working at heights that cannot be reached from the ground or from any other parts of the building.

A putlog is a horizontal tube which is used when there is only one row of standards. A putlog is fixed to the scaffold like a transom, but with one end supported by the building or structure against which the scaffold is being erected.