PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code
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9.27.1.1.General
(1) Where lumber, wood shingles, shakes, fibre-cement shingles, planks and sheets, plywood, OSB, waferboard,
hardboard, vinyl, insulated vinyl, polypropylene, aluminum or steel, including trim and soffits, are installed as cladding
on wood-frame walls or above-ground flat insulating concrete form walls exposed to precipitation, the cladding assembly
shall comply with
(a) Subsections 9.27.2. to 9.27.13., or
(b) Part 5.
(2) Where stucco is installed as cladding on wood-frame walls, above-ground flat insulating concrete form walls or
masonry walls exposed to precipitation, the cladding assembly shall comply with
(a) Subsections 9.27.2. to 9.27.5., and Section 9.28., or
(b) Part 5.
(3) Where masonry serves as cladding on wood-frame walls, above-ground flat insulating concrete form walls or
masonry walls exposed to precipitation, the cladding assembly shall comply with
(a) Subsections 9.27.2. to 9.27.4., and Section 9.20., except for masonry veneer, which shall be attached to above-
ground flat insulating concrete form walls in accordance with Sentence 9.27.5.4.(2), or
(b) Part 5.
(4) Where asphalt shingles are installed as cladding on wood-frame walls exposed to precipitation, the cladding
assembly shall comply with
(a) Subsections 9.26.7. and 9.27.2. to 9.27.4., or
(b) Part 5.
(5) Where an exterior insulation finish system is installed as cladding on wood-frame, masonry, cold-formed steel stud,
above-ground flat insulating concrete form or cast-in-place concrete walls exposed to precipitation, the cladding assembly
shall comply with
(a) Subsections 9.25.5., 9.27.2. to 9.27.4. and 9.27.14., or
(b) Part 5.
(See Note A-9.27.1.1.(5))
(6) Where cladding materials other than those described in Sentences (1) to (5) are installed, or where the cladding
materials described in Sentences (1) to (5) are installed on substrates other than those identified in Sentences (1) to (5),
the materials and installation shall comply with Part 5.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.