The Ontario Building Code | Minimum Size
9.14.3.2. Minimum Size
(1) Drain tile or pipe used for foundation drainage shall be not less than 100 mm in diam.
In Plain Language
Foundation drainage pipe must meet a minimum size requirement set out in this article, ensuring adequate capacity to carry away groundwater.
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.