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May 16, 2016 6:48 AM CST
|I watched the video you posted on u-tube on how to build a pvc green house. It tells you to put your rebarb 4 feet apart to anchor your sides but never mentions the width of the rebarb to determine the height of the house. Please give subjection as I have ready to put up the house.
May 16, 2016 6:52 AM CST
|I am not sure about the video you refer to. I don't understand the question about the "width of the rebar(b)" though. Rebar, at least the way I used it on my two greenhouses, was used only to anchor the structure, and had nothing to do with the height of the structures. Please expand on your question.
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By the way, welcome to ATP, @terrible.
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May 16, 2016 7:47 AM CST
|Welcome to Garden.org, @Terrible !
I haven't watched the videos for the PVC greenhouse project -- the National Gardening Association website was recently merged with All Things Plants, and many of the NGA features are brand-new to a lot of us long-time ATP members -- but I did locate them in the "How-To Videos" section that can be found in the blue sidebar on the left-hand side of the page.
However, I did see that there is a materials list for the project (which can be downloaded here: http://garden.org/howtovideos/Materials_List_Items%20Revised... ) that calls for 12 pieces of 36-inch rebar.
The framing diagram (shown here: http://garden.org/howtovideos/NGA%20-%20Greenhouse%20Diagram... ) indicates that the greenhouse is 14x20 feet in size. I believe you would first build the 14x20 wooden base frame, then pound the rebar into the ground just inside of that (so, approximately 14 feet apart for the width of the greenhouse).
I hope this was helpful for you; and I'm happy you asked this question, when I have a little more time I plan to take a closer look at these videos!
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May 17, 2016 8:37 AM CST
you will have to think about it in the shape of the object you want. A Circle is easiest but typically a PVC green house will be some kind of oval shape. For that, you might just have to estimate, since I don't know a formula for it, but you can get an idea from using the circle. Make the PVC pipe longer or shorter depending on the shape you wanted (as long as it reaches the other rebar).
But using the circle as an example, and assuming a 4x4 raised bed (which you cover to become a kind of green house).
The diameter is 4 ft (the size of the bed). If you wanted a "perfect" circle shape, the length of the PVC to go from rebar to rebar is 1/2 (2 * pi * r). (ie, half of the circumference of the circle)
So 1/2 (2 * 3.14 * 2) = 6.3 feet.
If you want the top of the loop to be a little higher, meaning more oval, make it 8 feet or 10 feet. From my personal experience, a 10-foot PVC pipe fits well for a 4x4.
But of course your greenhouse may have different measurements, so just use the same formula to find the length you may need.
May 17, 2016 10:53 AM CST
|Is this the video? http://garden.org/howtovideos/index.php?page=video001_007
This is a 14' x 20' hoop house. The rebar is placed only at the sides, 6 per side spaced 4' apart.
Review the Determining Foundation and Constructing the Foundation video.
Here's the framing diagram which you can download.
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