The most widely used scaffolding planks include the wooden planks and the aluminum planks. The applications of wooden scaffolding planks are common for two reasons: the planks are strong and they stack easily when in transport. 

Planks of scaffolding plank system for the construction site shall not be painted, treated, or coated in any way that could conceal defects or obscure the top or bottom surfaces.

Planks shall be properly stacked, off the ground, on a suitable foundation. Where the height of a stack exceeds 20 planks, measures shall be taken to tie or bound succeeding layers.

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.