PRANCE metalwork is a leading manufacturer of metal ceiling and facade systems.
How to Ensure Weather Resistance of Decorative Panels for Outside Walls?
Decorative aluminum panels on exterior walls must resist rain, wind, UV, and temperature cycles to preserve appearance and function. Begin with a rainscreen design: panels are mounted on an independent subframe with a continuous air cavity behind, allowing moisture to drain and evaporate. Ensure the cavity’s depth is at least 20 mm and that weep holes are provided at the bottom to prevent water accumulation.
Panel joints require flexible, UV-stable silicone or polyurethane sealants rated for exterior use (ASTM C920 Grade NS, Class 25). Maintain a minimum joint width of 8 mm to accommodate thermal movement. At panel terminations and penetrations, install flashings and drip edges to shed water away from the substructure.
Choose powder-coated or fluoropolymer (PVDF) finishes with proven resistance to chalking and fading—look for coatings that pass AAMA 2605 specifications. Proper pretreatment (chromate conversion coating) and primer layers ensure adhesion and corrosion resistance. In coastal or industrial areas, specify extended testing (2,000+ hours salt spray and acid rain resistance).
Perform biannual cleaning using mild detergents and soft brushes to remove dirt and pollutants. Inspect sealant joints and mechanical fixings yearly, reapplying sealant and tightening fasteners as needed. By combining rainscreen detailing, high-performance coatings, and proactive maintenance, decorative aluminum panels will deliver long-lasting, weather-tight façades.