Canada Occupational Health and Safety Regulations (SOR/86-304)

2.13 If there is a risk that tools or other objects could fall onto a person from a platform or other raised area, or through a floor opening or floor hole,

• (a) a toe board that extends from the floor of the platform or other raised area to a height of not less than 125 mm shall be installed; or

• (b) if the tools or other objects are piled to such a height that a toe board would not prevent the tools or other objects from falling, a solid or mesh panel shall be installed from the floor to a height of not less than 450 mm.