Which statement about zinc-coated sheets is true?

• A. They are easy to paint but not corrosion resistant.
• B. They are corrosion resistant but cannot be painted.
• C. They are easy to paint and corrosion resistant, making them good for roofs.
• D. They have poor durability for roofing materials.

Answer: (C)

Zinc-coated sheets rely on their zinc layer to protect the steel underneath. Zinc acts as a sacrificial coating, so even if the surface is damaged, the zinc still shields the steel from rust, giving good corrosion resistance. At the same time, the surface can be painted after proper surface preparation (cleaning and using a galvanized-compatible primer), so painting is generally straightforward. For roofing, you want material that can resist moisture and weather while also allowing a protective or aesthetic paint finish, which is exactly what zinc-coated sheets provide. That combination—easy painting with a durable corrosion barrier—makes them well suited for roofs. Some might think galvanized steel can’t be painted, but with proper pretreatment and compatible paints, painting is readily achievable.