Galvanizing is one of the best

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It is important to remember NFPA 285 is an assembly test, not a product-specific test. Although a given component passes the test in one assembly, this does not mean it will be compliant in another. As a result, when designing NFPA 285-compliant wall assemblies, certain combustible components cannot be mixed and matched without engineering evaluation conducted within limits imposed by 
the IBC.

The test of the assembly is comprehensive and includes everything from the interior rcs data drywall to the exterior cladding, along with the structural elements, insulation, and water and air barriers.

ways to protect steel, but the complex series of reactions necessary to prevent corrosion can be undermined by exposure. When hot-dipped galvanized steel is first exposed to the atmosphere, near-pure zinc at the surface reacts with oxygen to form a thin layer of zinc oxide. In turn, this reacts with water to form zinc hydroxide.