When sourcing boat docks, the choice of material directly impacts longevity and maintenance. High-Density Polyethylene (HDPE) is the industry standard for modular floating docks due to its UV resistance, impact strength, and anti-slip properties. For fixed docks, marine-grade aluminum (6061-T6) offers a superior strength-to-weight ratio and corrosion resistance compared to galvanized steel. If selecting wood, ensure it is pressure-treated for marine use or utilize composite decking to prevent rot and splintering in high-moisture environments.