(1) Flashing fabricated on site for vent pipes shall be fabricated from,
(a) copper sheet at least 0.33 mm thick,
(b) aluminum sheet at least 0.48 mm thick,
(c) alloyed zinc sheet at least 0.35 mm thick,
(d) lead sheet at least 1.73 mm thick,
(e) galvanized steel sheet at least 0.33 mm thick, or
(f) polychloroprene (neoprene) at least 2.89 mm thick.
(2) Prefabricated flashing for vent pipes shall be certified to CSA B272, “Prefabricated Self-Sealing Roof Vent Flashings”.