Roof flashing materials

(1)  Sheet metal flashing shall consist of not less than,

    (a)   1.73 mm thick sheet lead,

    (b)   0.33 mm thick galvanized steel,

    (c)   0.33 mm thick copper,

    (d)   0.35 mm thick zinc, or

    (e)   0.48 mm thick aluminum.

Article 9.26.4.2. Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.