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HeyBub[_3_]

wrote:
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?"

I would think the nails go as far away from the underlaying material as
possible. If in the valley, water running down the valley has many, many
places to leak through.