How Long Do Aluminium Panels Last in Harsh Environments?

High-quality aluminum panels designed for exterior cladding can last 25 to 40 years in harsh environments if specified and maintained correctly. Key factors include the base alloy, protective coating, and installation details. Marine-grade aluminum alloys (e.g., 5005, 5754) resist salt corrosion, while PVDF finishes with Kynar 500 resin maintain color and gloss for 30+ years under UV exposure. Anodized finishes with a thick oxide layer (≥25 microns) also deliver comparable longevity. Proper substrate preparation—abrasive blasting and conversion coating—ensures coating adhesion. Installation with stainless-steel flashings, hidden fasteners, and ventilated rainscreen cavities prevents moisture traps and galvanic corrosion. Routine maintenance—annual inspections, gentle washing—removes environmental deposits and extends service life. In polluted or coastal areas, biannual rinsing is recommended. With these practices, aluminum panels remain structurally sound and visually appealing for decades, making them a cost-effective choice for demanding climates.