I have a 1st floor porch ceiling that is separating and rusting that I need to tear down and replace. It's a steel porch with tile floors and what I'm guessing is some sort of corrugated galvanized steel deck.
My question is once I tear down the stucco steel mesh and wire brush the rust off, what do I replace it with? What is this stucco steel mesh thing called and is it normally used for exterior work under a porch?
If I do some sort of stucco mesh sheet replacement, will it just trap water and sag again? Should I just paint the wavy steel underneath and not put a replacement up, showing unpainted ribbed steel like my neighbors? If I don't replace it with some sort of painted stucco it won't match the 2nd-floor porch above it, but I'm also worried I'll run into the same problem again. It's tile floor on top - do I need to redo or reseal the tiles? I don't notice any obvious holes or cracks in the tiles above the ceiling.
What is the recommended way to refinish it - leave it bare or use some sort of coating/paint/covering? If that's galvanized steel underneath, paint won't stick to it correct? In that case if I wirebrush the rust transfer off, I might scrape the galvanized layer off in which case I'd have to treat that area? Or maybe there is a gentler way of removing the rust residue without scraping the galvanized coating? Is it a safe guess to assume that it's galvanized deck, or is there some steel deck that's not galvanized?