What mil is that plastic? I got 5 mil UPFD or wtf ever that shit was, not even gonna goggle it. I gotta huge roll of it with plans on building a few hydro towers off the back of my house. Im hopefull it will be suffecient but idk. My greenhouse will only be used for the free light. I wont actually use the dirt or air lol. Anyways, dunno if what im saying seems praticle, but im just trying to grow all year round. Seems easier if its attached, and one side is on a building. I wanted it low to keep the heat from the ground in during the winter, but I think ill have a hard time blowing air through the entire thing cause it will be so long. So yea, im thinking a 4x10 or something like that. . what you do you all think?