How do I select the correct finish based on environmental conditions?

We recommend selecting based on the ISO 12944 corrosion classification:

C1–C2 (Indoor/Dry): Pre-Galvanized (Smooth/Spangle).

C3–C4 (Urban/Industrial): HDGAF or ZAM.

C5 (Marine/Offshore): Stainless Steel 316L or ZAM for the highest durability in the international market.