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Aluminum Alloy Double Standing Seam Roofing Roof Sheet Triseam25-430 (td001). No Hole Installation: Hidden clips absorb thermal expansion; no punching or sealant needed. High Performance Waterproof: Double lock standing seam ensures robust waterproofing and ventilation. Long Service Life: Aluminum alloy construction ensures more than 50 years of service life. Flexible Design Capability: Supports curved panels and various architectural shapes with rib seam zipping. Thermal & Sound Insulation: Sandwich layer with mineral insulation reduces heat transmission and echo. Lightning Protection: Metal roofing forms an effective lightning arrester for safety. OEM/ODM Service: Flexible customization from samples or designs available for buyers.