The Ontario Building Code | Slope
9.8.5.4. Slope
(1) The slope of ramps shall be not more than,
(a) 1 in 10 for exterior ramps,
(b) 1 in 10 for interior ramps servingresidential occupancies,
(c) 1 in 6 for mercantileor industrial occupancies, and
(d) 1 in 8 for all other occupancies.
In Plain Language
A ramp's slope (steepness) can't exceed the maximum set out in this article, since a ramp that's too steep becomes difficult or unsafe to use, particularly for wheeled 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.