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RE: Bob's "Make-Do" Greenhouse! Plastic Water Pipe, 6 Mil Barrier and Duct Tape.
My property also came with some free junk including that type of black pipe. I have kept most of it hoping we could use it for something. I had not considered using it for a greenhouse but will have to give it a try.
I would hesitate to make a full arch with it unless you had some structural ridge board, but it suffices for a half arch easily!