Final answer:
The question pertains to the specifications for aluminum used in flashing that ensures corrosion resistance. Galvanization provides protective measures for steel by using zinc as a sacrificial layer to prevent oxidation.
Step-by-step explanation:
The student is inquiring about the thickness of aluminum that can be used for flashing in construction to ensure it is corrosion resistant. The other materials listed are galvanized steel, copper, and lead-coated copper, each with specified dimensions or weights. Galvanization is a method of preventing corrosion on iron or similar metals by applying a protective coating of zinc. The more reactive zinc serves as a sacrificial layer, which protects the iron or steel beneath from oxidation and corrosion.
The properties of galvanized steel make it an ideal choice for outdoor or wet environments where corrosion resistance is vital. This is due to the surrounding zinc layer that offers both prophylactic protection (protects the underlying steel from oxygen in the air) and cathodic protection (when exposed, the zinc will oxidize before the steel itself).