The Ontario Building Code | Front Edge of Stair Treads
9.9.2.5. Front Edge of Stair Treads
(1) Except for curved stairs, the front edge of stair treads in exitsand access to exits shall be at right angles to the direction of exit travel.
In Plain Language
The front edge of stair treads within an exit must meet specific visibility or marking requirements set out in this article, helping people see each step clearly, particularly during an emergency.
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.