S-2.1, r. 4 - Safety Code for the construction industry

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6.7.2. Diagonal bracing: At every 4 rows of telescopic jacks, a diagonal bracing placed at a 45º angle shall be installed on both vertical planes perpendicular to each other. This bracing shall alternate from top to bottom and from bottom to top.
R.R.Q., 1981, c. S-2.1, r. 6, s. 6.7.2.