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Aluminum Alloy Double Standing Seam Roofing Roof Sheet Triseam25-430. Long Service Life: More than 50 years in common climate conditions. Flexible Customization: Customization from samples and designs with flexible options. Curved Panel Capability: Capable of producing curved panels for various architectural shapes. No Hole Installation: Features no hole or punching installation for a seamless look. Water-Proof & Ventilated: Robust water-proofing surface with ventilated layer design. Maintenance-Free: Designed to be maintenance-free with no sealant or adhesive needed. Extra-Long Panels: On-site fabrication enables extra-long panel production.