That's good context, thanks. We're quite near a salt water estuary here, I imagine the humidity and salt in the air also makes a difference... Another thing y

That's good context, thanks. We're quite near a salt water estuary here, I imagine the humidity and salt in the air also makes a difference... Another thing you can do relatively cheaply (I think) is powered cathodic protection. I don't know if they bothered to do that on this building.