The Ontario Building Code | Slab Construction
188.8.131.52. Slab Construction
(1) Concrete shall be cast against form work in accordance with CSA A23.1, "Concrete Materials and Methods of Concrete Construction".
(2) The slab shall be not less than 125 mm thick.
(3) The slab shall be reinforced with 10M bars spaced not more than 200 mm o.c. in each direction, with 30 mm clear cover from the bottom of the slab to the first layer of bars, and the second layer of bars laid directly on top of the lower layer in the opposite direction.
Section 9.40. Additional Requirements for Change of Use