The Ontario Building Code | Stucco Lath Specifications
9.28.4.3. stucco Lath Specifications
(1) stucco lath shall conform to Table 9.28.4.3.
Table 9.28.4.3.
stucco Lath
Forming Part of Sentence 9.28.4.3.(1)
| Item | Column 1 Location | Column 2 Type of Lath | Column 3 Minimum Diam of wire, mm | Column 4 Maximum Mesh opening | Column 5 Minimum Mass, kg/m2 |
| 1. | Vertical surfaces | Welded or woven wire | 1.15 | 25 mm | — |
|
|
| 1.30 | 38 mm | — | |
|
|
|
| 1.50 | 51 mm | — |
|
|
| stucco mesh reinforcing (expanded metal) | — | 25.8 cm2 | 0.98 |
| 2. | Horizontal surfaces | 9.5 mm rib lath | — | — | 1.84 |
|
| Cedar lath | — | — | — |
In Plain Language
Stucco lath must meet the specifications set out in this article, ensuring adequate reinforcement for the applied stucco coats.
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.