Last year we bought a cheap plastic 10×15 greenhouse on Amazon, it lasted approximately 72 hours until a wind storm knocked it down. So we planted everything directly from seed , which was very late in the season, that set us back big time, but we still had a decent harvest.
This year made sure we’re going into 2022 with a sturdy Greenhouse that won’t blow over.
I did purchase pressure treated for the sill plate and pine for the roof trusses, I just didn’t have time to mill the wood for the trusses.
Used Solexx greenhouse covering, its a double walled 5mm polycarbonate for the roofing and the walls, bottom has steel roofing to protect from the insane winds and deep snow.