How do I know if a building is using aluminum sheets?

To determine if a building is using aluminum sheets, look for the following signs: 1) Shiny, metallic appearance, which is characteristic of aluminum. 2) Lightweight construction, as aluminum is less dense than many other metals. 3) Resistance to corrosion and weathering, a common feature of aluminum. 4) Use in areas prone to water or moisture, as aluminum is water-resistant. 5) Check for the manufacturer's specifications or building materials list. If possible, consult with the building's architect or engineer for confirmation.