Yes, zinc wall cladding does change color over time.
This is due to the natural oxidation process where zinc reacts with the elements (moisture, air, etc.) to form a protective layer called a patina. This patina gives zinc its characteristic bluish-gray appearance.
Initially, zinc cladding has a shiny, silvery look, but as it weathers and oxidizes, it will gradually develop the patina, causing the color to change and darken.
The exact rate and extent of the color change will depend on several factors, including the local climate, exposure to pollutants, and the specific type of zinc finish applied.
Some people appreciate the evolving aesthetics of zinc cladding as it ages, while others prefer to maintain the original finish with regular maintenance and coatings. It is important to understand this natural process when choosing zinc cladding for your building.