The Ontario Building Code | Fastening
9.28.4.6. Fastening
(1) stucco lath shall be fastened in conformance with Subsection 9.27.5.
(2) Fasteners on vertical surfaces shall be spaced not more than,
(a) 150 mm o.c. vertically and 406 mm o.c. horizontally, or
(b) 100 mm o.c. vertically and 610 mm o.c. horizontally.
(3) Nailing patterns other than those required in Sentence (2) are permitted to be used provided there are not fewer than 20 fasteners per square metre of wall surface.
(4) Fasteners on horizontal surfaces shall be spaced not more than,
(a) 150 mm o.c. along the framing members when members are spaced not more than 406 mm o.c., and
(b) 100 mm o.c. along members when members are spaced not more than 610 mm o.c.
9.28.5. stucco Mixes
In Plain Language
Stucco lath must be fastened as set out in this article, ensuring it stays securely attached to resist the weight of wet stucco during application.
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.