S-2.1, r. 13 - Regulation respecting occupational health and safety

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12. Guardrails: Any guardrail incorporated in a building, with the exception of a guardrail that is part of any equipment, shall comply with the National Building Code as applied at the time of its installation.
Other guardrails shall be so designed, constructed and installed as to withstand the following minimum loads:
(1)  a 0.55 kN horizontal single point load applied at any location on the top rail;
(2)  a 1.5 kN per linear metre load applied vertically at the top rail.
In addition, such guardrails shall be provided with a top rail located between 900 mm and 1,100 mm from the floor and at least an intermediate rail fixed at midway between the top rail and the floor.
The intermediate rail may be replaced by balusters or panels.
O.C. 885-2001, s. 12.