In an outdoor fencing system, the width and thickness of the boards directly determine privacy and structural stability. Our 160 x 20 mm WPC co-extruded fence board abandons the weaknesses of traditional thin panels—such as light leakage and wobbling—and is specifically engineered for high-end privacy enclosure. Unlike traditional wooden fences nailed directly to timber posts, these boards feature precision side grooves designed to pair perfectly with heavy-duty aluminum posts and frames. Using hidden slots or clips, the boards can float slightly within the aluminum frame to absorb thermal expansion, completely eliminating cracking or loosening over time.