In Plain Language

Where a foundation or part of a building is subject to hydrostatic uplift, the buoyant pressure exerted by groundwater pushing upward, that effect must be accounted for in the structural design.

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.