Which tile fastener material cannot be used in coastal building zones?

Which tile fastener material cannot be used in coastal building zones?

• A. Stainless steel
• B. Galvalume
• C. Copper
• D. Aluminum

Answer: (B)

Coastal environments demand fasteners that withstand salt-laden air and moisture, because chloride exposure accelerates corrosion. Galvalume uses a zinc-aluminum coating on steel, which protects well in many settings, but in coastal zones the salt spray can attack the coating more aggressively and any damage or scratches expose the steel underneath. This makes fasteners with Galvalume prone to quicker corrosion, potential coating failure, and rust-driven issues over time, so they are not suitable for coastal applications. In contrast, stainless steel, copper, and aluminum fasteners offer better resistance to salt exposure, making them appropriate choices for tile installations in coastal areas.

Coastal environments demand fasteners that withstand salt-laden air and moisture, because chloride exposure accelerates corrosion. Galvalume uses a zinc-aluminum coating on steel, which protects well in many settings, but in coastal zones the salt spray can attack the coating more aggressively and any damage or scratches expose the steel underneath. This makes fasteners with Galvalume prone to quicker corrosion, potential coating failure, and rust-driven issues over time, so they are not suitable for coastal applications. In contrast, stainless steel, copper, and aluminum fasteners offer better resistance to salt exposure, making them appropriate choices for tile installations in coastal areas.