5. Squaring the high tunnel 4 x 5 = 20 3 x 5 = 15 5 x 5 = 25 4 3 5 Pythagorean theorem
6. Square up the corners, or make sure the 2 distances between corners is the same, and the frame will be square! Tip – When working with a second person, always have the same person looking at the tape measure when taking the measurement!
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8. But what if instead of being flat, your land lays…
11. Drainage - a key consideration! A 30 by 96 foot high tunnel will shed 1728 gallons of water in a 1 inch rainfall. So a 5 inch rainfall means you’re dealing with over 8600 gallons of water!
25. Here I’m attaching a channel to hold the poly with wiggle wire to the first and last frame of the high tunnel before it’s erected.
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44. Simple window framing using 2 x 2’s, a couple of hinges, a few screws to hold the string in order to open and close the window and a hook n’ eye to hold it closed! After years of use, we find that the windows warp and want to come apart, so we now reinforce the corners with either a steel “L” or a plywood gusset.
45. Notice the window in the top of the frame, and the main windows are open only halfway for venting on a cold day.
46. Here the windows have been opened all the way as the day has begun to warm up.
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49. Roll up end walls Courtesy University of Arkansas
70. Manufacturer Dimensions Cost (US $/ft 2 ) Atlas Greenhouses 30 ft. x 96 ft. Conley Greenhouse Mfg 24 ft. x 96 ft. FarmTek 26 ft. x 96 ft. Harnois Greenhouses 20 ft. x 96 ft. Haygrove Tunnels 24 ft. x 200 ft. Stuppy Greenhouse 20 ft. x 96 ft. Zimmerman Welding 30 ft. x 96 ft. Average 25 ft. x 96 ft. (2400 ft 2 ) ($1.50-$3.00)/ft 2
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72. Okay, so you decide to buy it First, take detailed pictures before de-constructing Number all parts – attachment of bows may be different, bow to bow For example, label first bow, if three piece, B1L, B1C, B1R As you disassemble, think about safety Put all small pieces – bolts, etc, in labeled boxes or buckets to keep them together and easy to find when re-erecting. Make note of fasteners that will not be reusable so you can purchase BEFORE you are on that ladder needing it. Try to load as you go – not handling more times than necessary When unloading, try to keep pieces together in some order that makes it easy to find Try to re-erect as soon as possible – forgetting comes easy!
73. Maintenance & Up Keep So we think check your poly for splits and for how fragile it feels, but you may not have to replace it at 4 years.