I have a lean-to that was originally covered with that cheap translucent green corrugated fiberglass material. It's leaking pretty bad. I've got friends who want to keep stuff in this lean-to and they're volunteering to put up steel if I buy the materials.
My pole barn is probably 20 years old and has the steel fastened through the ribs. Newer pole barns have the steel fastened through the valleys.
How are the kids doing it these days, and which way is "right?"