The Ontario Building Code | Grading
9.14.4.3. Grading
(1) The bottom of an excavation drained by a granular layer shall be graded so that the entire area described in Article 9.14.4.2. is drained to a sump conforming to Article 9.14.5.2.
In Plain Language
Granular drainage material must be graded (sloped) as set out in this article, directing water toward the drainage pipe rather than letting it pool.
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.