Stainless hardware touches aluminum, galvanized, or coated duct/supports
Verify the dissimilar-metal detail before fastening. Stainless, aluminum, galvanized steel, coated steel, and other metals can react differently when moisture and corrosive air are present.
Stop if Ask when different metals touch, the environment is wet/corrosive, or the detail does not show isolation/coating requirements. Watch out Do not assume stainless plus aluminum or stainless plus galvanized is automatically safe in wet or corrosive air. Check Identify both metals Check drawings/specs/submittals Verify washers, isolation pads, gaskets, coatings, sealants, or approved fastener system Ask before mixing hardware Document any corrosion already present. Steps Identify both metals Check drawings/specs/submittals Verify washers, isolation pads, gaskets, coatings, sealants, or approved fastener system Ask before mixing hardware Document any corrosion already present. Say this to your foreman This connection mixes metals. Is there an isolation, coating, washer, gasket, or fastener detail we need to follow?
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