PART XI SCAFFOLDS, STAGES AND WORK PLATFORMS — Lumber planks

be rough sawn and of not less than 5.08 centimetres by 25.40 centimetre dimensions;

extend not less than 15.24 centimetres and not more than 30.48 centimetres beyond the supporting members;

be supported at intervals not exceeding 3.05 metres for light work and 2.13 metres for heavy work, including bricklaying and masonry;

be of uniform thickness in adjoining planks; and

have maximum allowable deflection not exceeding the span length divided by 80.

Each lumber scaffold plank shall be visually inspected for defects before each installation and shall be removed from service where it is found to be defective.