How does a metal cladding wall perform in coastal environments with high salt and moisture exposure?

Coastal environments present accelerated corrosion challenges due to salt-laden air, high humidity and frequent wet-dry cycles. A metal cladding wall can perform successfully in these conditions when material selection, protective finishes, detailing and maintenance are all tailored to the coastal context. Material choices favor high-corrosion-resistance options: anodized aluminum, marine-grade stainless steel (e.g., 316), or properly galvanized and duplex-coated steels are common selections. High-performance coatings such as PVDF with appropriate film thickness provide additional protection against salt spray and UV degradation; anodizing enhances aluminum’s natural oxide layer for passive corrosion resistance. Detailing to prevent trapped moisture is critical — designs should avoid crevices where salt can accumulate and ensure adequate drainage and ventilation behind the cladding. Isolation from dissimilar metals (e.g., using non-conductive washers and barriers) prevents galvanic corrosion. Fasteners should be stainless or similarly corrosion-resistant and specified for marine exposure. Where possible, design for easy access and replacement of affected components, and locate vulnerable elements away from direct exposure. Maintenance regimes in coastal zones must be more proactive: regular rinsing with fresh water to remove salt deposits, inspections of seals and fasteners and scheduled touch-up coatings. Consideration of expected service life, lifecycle cost and warranty terms specific to coastal exposure should drive final material and finish decisions. When these precautions are observed, metal cladding walls offer durable and attractive façades even in aggressive coastal environments.