I was thinking of trying a hoop covered area to preserve my potted plants this winter. Anyone ever build one? The materials may be pricey, but can always be re-used, I suppose. I have yet to visit the big orange store to see about their long skinny PVC for the hoops, plus the short lengths of rebar to secure them. That part sounds rather simple (???). As for the cover, not so sure about that. I would like something that would stay on all the time, and allow for light and transpiration. Where should I look in the Seattle area, and what am I looking for?
PVC pipes are cheap. I don't know about rebar. You could replace the rebar stakes with short lengths of PVC pipe ("sleeves") big enough that your hoop-pipes nest inside it.
I ws thinking that, if my tunnel is low enough, that I might use very thin PVC hoops, like 1/2" or 3/4".
I was thinking of stabliizing the hoops by lashing 3 runs of very light bamboo stalks lengthwise - along the top and half-way down. I see the YouTube video used a 1x3" wooden "spine" for the same purpose. I was thinking of lashing bamboo to PVC with waxed twine.
I have some very flimsy bamboo, but I use it by lashing it length-to-length so that the thinnest part of one overlaps the thickest part of the next.
I used the longer PVC and rebar 18" length. I did not do the bending but my garden helper did. We first put in the rebar and then hooked the PVC on the rebar nearest the fence. He slowly bent it and attached it to the other piece of rebar. He told me he needed to heat it and I told him no he did not. He thought I was crazy but it is my garden so he did what I asked. It worked beautifully but I think because it was longer, made it easier.
My biggest problem was keeping the cover on it during our late winter, early spring high winds.
I wanted koops wioth a permanent bend, and looked into methods for heat-bending PVC. You don';t wnat it to buckle, sag, or bend unevenly.
Now I think I'll use metal "EMT" electircal conduit for permanently-bent hoops. I c an also make specificly-sloped roofs that way. For example, in one bed, I want a cold-frame-like shape that faces the sun as much as possible, and also throws water in just opne direction (towards the drainage trench).
But I have so many priojects in mind, and so little time, it might be years before I actually DO it!