The Ontario Building Code | Parapet Walls
9.20.6.5. Parapet walls
(1) The height of parapet walls above the adjacent roof surface shall be not more than three times the parapet wall thickness.
(2) Parapet walls shall be solid from the top of the parapet to not less than 300 mm below the adjacent roof level.
In Plain Language
Parapet walls, the portion of a wall extending above the roofline, have specific requirements set out in this article given their added weather exposure on multiple sides.
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.