S-2.1, r. 13 - Regulation respecting occupational health and safety
14. Floor: Any floors shall be:
(1) kept in good order, clean and free from any obstruction;
(2) provided with walkways that comply with section 15;
(3) provided with drains, if required for maintenance and the draining off of liquids;
(4) free from any opening capable of causing an accident, unless they are protected with a guardrail or a cover capable of withstanding loads to which they may be exposed.