The dimensions, shape and arrangement of scaffolding decks are appropriate to the nature of the work to be carried out and to the loads to be supported. They allow safe working and movement. Scaffolding decks are assembled in such a way that their components cannot move during use. There must be no gap of more than 20 centimetres between the edge of the decks and the structure or equipment against which the scaffolding is set up.
When the configuration of the structure or equipment does not allow this distance limit to be respected, the risk of falling is prevented by the use of collective or individual protection devices under the conditions and according to the procedures defined in articles R. 4323-58 to R. 4323-61. The same applies when the scaffolding is set up against a structure or piece of equipment that does not exceed the floor level of the scaffolding by a sufficient height.