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I built a greenhouse out of PVC last year to see what results I would get VS growing veggie's in the traditional garden style in the AZ winters. The GH growing smoked the traditional style growing by 10 times over and is why I will have a permanate GH this year. Some observations using plastic sheeting. Every time the wind blows the sheeting will stretch over the frame. About 3mths latter and it's time to resretch the plastic. Plastic sheeting needs a brace every 4sft, I don't care what anyone says. It's very hard to 100% seal plastic. After watching a home improvement show, there's only one glue made for PVC sheeting and Liquid Nails makes it. Me I ran a wire down at the bottom then rolled the sheeting around that then stapled. No4 rebar sunk 18" into the soil spaced every 2ft is enough to hold the frame down under any wind condition. I left 6" of rebar above ground then slipped the PVC pipe over the rebar and used a piece of wire tied to the rebar to a screw in the PVC for a hold down. This works well. I used sch40 3/4 for a frame. That's just not heavy enough. 1"PVC would better with 1-1/4" ideal. The PVC wants to got into a quansit hut configuration when you slip it over the rebars. For outdoor use, I would look at using T1-11 with 2x4 frame for about the same cost. That 12ft x 12ft GH cost me $125 and if I remember correct wood frame constrction was under $500. A oiless compressor is under $50. I would read some articles about SCUBA gear for a through understanding of breathing air in tanks and piping. T_Bone
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