Will the steel structure actually be exposed to rain, or will it be
protected by plastic/wood/etc. cladding of some kind?
In my limited experience, painted (but ungalvanised) steel beams last
quite well if they rarely encounter liquid water.
It would be difficult to protect the structure from rainwater. It might
however, be possible to make it all out-of-sight, say by encasing the
girders in upvc.. (Not easy, but just about doable. But probably cheaper
than galvanizing). I'm just a bit concerned that where the angle-section
steel will project from the painted wall of the house, there would be a
constant rust stain projecting downwards that would constantly need
painting-over. But perhaps that's a price worth paying to avoid the cost of
Many thanks to all for the other advice here.
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