In Plain Language

A sheet metal leader (a downspout-style drainage component) can't be used except above ground outside a building, limiting this lighter-duty material to exterior, non-structural drainage applications.

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.