Greenhouse U channel

This is my alpha build. I use waffle head screws instead of self tapping hex head screws, so less air leaks out. I also round my corners with 4 22.5 degree cuts so I don’t have a sharp 90 degree corner. I’ve had 50 mph gusts and no issues. If a derecho takes the polyethylene, I can replace it in an hour. The post frame is 4 ft into concrete so they should be fine. If I had more money I would have done wanna tubes and mounting brackets to last much longer. This is how I spent my $1400 stimulus check. Stay tuned for more of my ideas on surviving the apocalypse. It’s a exciting time to walk the earth.