Code Library › Volume 1 › Section 9.20 — Masonry and Insulating Concrete Form
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.20.13.1.Materials for Flashing

(1) Materials used for flashing shall conform to Table 9.20.13.1. (2) Aluminum flashing in contact with masonry or concrete shall be effectively coated or separated from the masonry or concrete by an impervious membrane. Table 9.20.13.1. Flashing Materials Forming Part of Sentence 9.20.13.1.(1) Minimum Thickness, mm Material Exposed Flashing Concealed Flashing Aluminum 0.48 — Copper 0.46 0.46 Copper or aluminum laminated to felt or kraft paper — 0.05 Galvanized steel 0. 33 0.33 Lead sheet 1.73 1.73 Polyethylene — 0.50 Roll roofing, Type S — standard Zinc 0.46 0.46

This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.

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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.