The Ontario Building Code | Levelling of Sill Plates
9.23.7.2. Levelling of Sill Plates
(1) Sill plates shall be,
(a) levelled by setting them on a full bed of mortar, or
(b) laid directly on the foundation where the top of the foundationis level.
(2) The joint between the sill plate for exterior walls and the foundationshall be sealed in accordance with Subsection 9.25.3.
9.23.8. Beams to support Floors
In Plain Language
Sill plates must be levelled as set out in this article, ensuring the framing built on top starts from a true, even base.
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.