Scaffold boards shall not be stand on end unattended.
And scaffold planks shall not be used as concrete forms, trench shoring, or as sills for scaffolds.
All scaffolds shall have a specified load rating, corresponding to the maximum intended load, of either light-duty, medium duty or special duty. For design, the maximum intended load shall be taken as the scaffold’s loading rating.
All scaffoldings and scaffolding boards shall not be loaded in excess of their loading rating.
The maximum allowable for fabricated planks and platforms shall be determined by the manufacturer and shall be the shortest simple span required to support, without failure, the platform unit’s own weight and at least four times the most critical maximum intended load.