What are the advantages of “Hot-Dip Galvanized After Fabrication” (HDGAF)?

Unlike pre-galvanized steel, HDGAF starts with “black steel” plate. The trunking is fully fabricated (cut, punched, and welded) and then immersed in a molten zinc bath. This ensures that all edges and welds are completely sealed. While the surface is naturally more textured or rougher than pre-galvanized steel, the zinc layer is significantly thicker, providing 40+ years of maintenance-free service in industrial or outdoor environments.