Too scared to click on CL's link....the URL said enough!!!!!
So we put in a plasticy greenhouse in May. It's 10 x 20, with 3" metal pipes for the main supports with that heavy duty clear plastic that has the square cross weave for extra strength. It didn't come with tie downs and we had meant to order some but hadn't yet. Didn't think we had to worry about them until Fall. WRONG!!!! Today the entire greenhouse lifted and rolled down our front yard. It was inside our fenced veggie garden, so the metal T-posts went right through it and tore it in two places. SO SAD!!! 
I thought it was toast. BUT. We all got our there and luckily it landed up against some cedar trees right side up, so we were able to take the fencing down and lift and carry it back into place and then put the fence back up. We went and got more heavy duty 6' Tposts and pounded them half way into the ground, and then cable tied and bungee corded at all 8 support legs to the very burried T-posts. Hopefully that will hold it down. ......sigh. Also found some wide clear UV tape at the Greenhouse Megastore to try and repair the tears. Three of the posts were bent, but DH was able to pound them back into shape. Lesson learned! If you have a big plasticy lightweight building, make sure you tie it down well for these freak windstorms!
It must have lifted straight up in the air before it rolled too. I have 18 tomato plants in there that are about 4-5' tall, and none of them were knocked over! Hard to believe.
Anyway, that was our excitement for today. Just wanted to share to give a big heads up. And if anybody else has any more brilliant tie down ideas, I'd love to hear them!
And I am having major hatching withdrawls!!! Haven't hatched since early May for Kim!!!! But I am still on hold cause the girls and I are going back east to visit my mom for 2 wks, and I couldn't leave chicks here for DH to watch as he will already have all the adult chickens to watch for me!!! But as soon as we are back, look out!!! LOL!!! Chicky time!!! 