The Ontario Building Code | Loads on Stairs and Ramps
9.8.9.1. Loads on Stairs and Ramps
(1) Except as required in Articles 9.8.9.4. and 9.8.9.5., stairs and ramps shall be designed for strength and rigidity under uniform loading criteria to support specified loads of,
(a) 1.9 kPa for stairs and ramps serving a single dwelling unit, and
Note: On July 1, 2017, Clause 9.8.9.1.(1)(a) of Division B of the Regulation is amended by striking out "single dwelling unit" and substituting "houseor an individual dwelling unit". (See: O. Reg. 139/17, s. 85)
(b) 4.8 kPa for other stairs and ramps.
In Plain Language
Stairs and ramps must be designed to safely carry the loads set out in this article, covering both the people using them and, where relevant, any equipment.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.