The Ontario Building Code | Pigments
9.28.5.2. Pigments
(1) Pigment if used shall consist of pure mineral oxides inert to the action of sun, lime and cement.
(2) Pigment shall not exceed 6% of the portland cement by weight.
In Plain Language
Pigments added to stucco for colour must meet the requirements set out in this article, ensuring they don't compromise the stucco's structural performance.
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.