6.7.1. Horizontal bracing:1. A horizontal bracing shall be placed horizontally in 2 directions at right angles to each post of any shoring when:a) this post is 1.8 m high or more and is placed on the soil;
b) this post is 3.5 m high or more and rests on a concrete slab.
2. The horizontal bracing shall be placed:a) as close as possible to the mid-height of the posts unless another point of buckling is indicated by the calculations; and
b) when posts are 5.5 m long or more, at heights not exceeding 2.7 m between this bracing and:i. the bottom or the top of the post; or
ii. another bracing on the same post.
3. The bracing required in subsection 1 may be omitted if the engineer who drew up the calculations of the concrete shoring plan indicates on the plan he submits that it is not necessary.