In my area, corrugated steel is sold with 'zinc-alum' and powder-coating pre-applied. I think they also apply paint to cut edges and drilled holes during insta

In my area, corrugated steel is sold with 'zinc-alum' and powder-coating pre-applied. I think they also apply paint to cut edges and drilled holes during installation. Its extremely popular, probably seen on around 50% of roofs, and is also used for exterior cladding on a lot of new houses. (although as cladding, it's usually used for only half the house, alternating with some other cladding)