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That totally makes sense, I just was confused by the immaculate state of the brackets.

Yes, the supports are galv, and I also suspected them, but my understanding of galvanic corrosion is that the zinc coating on them should corrode first before the steel starts. Also yes, that is New Zealand, so the climate is quite wet here.

Thanks guys, most likely we will go for the partial replacement of the affected section. Any advise on what could be done (a cost-effective solution) to minimise corrosion there in the future? The only thing which I can think of would be use a proper coating system and seal gaps between the ends...

Hi, We are working on a project with extensive corrosion on I-beams which support a residential garage. The ends where they go to concrete, are completely gone and you can put a finger through some of the I-beams. Wondering what could be the reason for such extensive corrosion? The whole...