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

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6.5.4. If the shores rest on concrete slabs, the loads due to the shoring of the upper floors shall not exceed the initial design loads. For slabs:
(a)  100 mm thick or less, the sill shall support a minimum of 3 posts and shall be at least equal in length to the number of posts multiplied by their spacing;
(b)  more than 100 mm thick, wooden pieces covering more than the entire telescoping jack flange area shall be used between the slab and the telescopic jacks.
R.R.Q., 1981, c. S-2.1, r. 6, s. 6.5.4.