PART XI SCAFFOLDS, STAGES AND WORK PLATFORMS — Extension of uprights
173
(1) A wood upright may only be extended using a butt joint, strengthened by two wooden splice plates not less than 1.2 metres long.
173(2)
The splice plates for wood uprights shall have a minimum thickness of 38 millimetres and be of the same width as the spliced members.
173(3)
The combined cross-sectional area of the splice plates shall be at least that of the vertical upright member.
Not legal advice. Verify the cited article against the signed agreement.