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Putting a spiral staircase on a screened deck. is powder-coated aluminum worth the extra investment over using galvanized steel? area has a humid climate and structure is close in proximity to saltwater.
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Putting a spiral staircase on a screened deck. is powder-coated aluminum worth the extra investment over using galvanized steel? area has a humid climate and structure is close in proximity to saltwater.
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powder coating is a layer of plastic powder that is melted onto the aluminum in an oven. It makes a vinyl (or whatever plastic you have) layer supiciously similar to a layer of latex paint. I've seen powder coating flake just like paint and seen corrosion where the powder coating has loosened and water has gotten traped.
I have to admit, I've never seen powder coated spiral stairs.
I'd go with galvanized, especially if it's less expensive.