Reply #26: There is also a mold-resistant paper-faced drywall

[jmowreader]

Its face paper is purple.

The other problem with steel framing in residential construction is the precision with which one must work. If you need to cut ten studs to length to hold up a large window, say, each of those ten studs must be exactly the same length. If they're not, the whole weight of the window is being supported not by the studs but by the screws fastening the studs to the top and bottom plates.

In Florida there should be (but is not) a code requiring all framing lumber be pressure-treated with a borate preservative. They make this treatment by dissolving boric acid in water. Boric acid's perfectly safe for humans--there are several diseases that are treated with it--but it's death on bugs and molds.