The Ontario Building Code | Compacting or Filling With Concrete
9.12.4.1. Compacting or Filling With Concrete
(1) Thesoil in trenches beneath footings for sewers and watermains shall be compacted by tamping up to the level of the footing base, or shall be filled with concrete having a strength not less than 10 MPa to support the footing.
Section 9.13. Dampproofing, waterproofing and soil Gas Control
9.13.1. General
In Plain Language
Certain excavated areas must be compacted or filled with concrete as set out in this article, ensuring adequate bearing support beneath parts of the foundation.
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.