The Ontario Building Code | Aggregate
9.28.2.2. Aggregate
(1) Aggregate shall be clean, well-graded natural sand or sand manufactured from crushed stone, gravel or air-cooled blast furnace slag and shall contain no significant amounts of deleterious material.
(2) Aggregate grading shall conform to Table 9.28.2.2.
Table 9.28.2.2.
Aggregate Grading for stucco
Forming Part of Sentence 9.28.2.2.(2)
| Item | Column 1 | Column 2 | Column 3 |
|
| Sieve Sizes, mm | % Aggregate Passing Sieve |
|
|
|
| Maximum | Minimum |
| 1. | 4 | — | 100 |
| 2. | 2 | — | 90 |
| 3. | 1 | 90 | 60 |
| 4. | 0.5 | 60 | 45 |
| 5. | 0.25 | 30 | 10 |
| 6. | 0.125 | 5 | — |
In Plain Language
Aggregate used in stucco mix must meet the requirements set out in this article, ensuring consistent strength and texture.
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.