Hailstorm here a few weeks back punched a bunch of holes in my greenhouse. I thought I was being smart using the corrugated poly panels, but that turned out not to be the case. I was warned by another poster here, I’ve forgotten who, that the stuff was brittle and wouldn’t hold up. It looked nice while it lasted but I won’t use that type of panel again.
I haven’t yet decided whether to use hoop house film or barn metal on the roof when I replace it. Considering the angle of the sun during the winter I wouldn’t be losing much light if I put metal on the roof, and it will certainly be less work during warm weather putting up/taking down shade cloth. Hoop house film for sure will be used on the sides.