Revision of Low-cost mobile hoophouse from Wed, 03/21/2012 - 13:24

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Prototype created by Oxbow Farm

Bill of Materials:

Item Quantity Cost (approximate)
1.75" Toprail Fence Tubing 38 $418
0.5" EMT Conduit 19 $41
0.75" EMT Conduit 10 $43
2" U-bolts 26 $28
2X2" Angle Iron 6 $138
1.75" brace bands 40 $26
1.5" carriage bolts and nuts 40 $11
4" carriage bolts and nuts 20 $13
4.5" eye bolts and nuts 8 $10
Gabion Basket wire roll 1 $32
Finned Super Stakes 8 $12
3 foot sections 0.125" Aircraft cable 16 $15
0.125" cable ferrules 32 $24
2" coated exterior screws many $25
Self-tapping screws 38 $8
1.75" Greenhouse Cross-Connectors 13 $20
10 foot 1X4" boards 20 $37
8 foot 2X4" boards 6 $30
8 foot 1X2" furring strips 22 $28
28 footX50 foot Greenhouse Plastic 1 $130

Tools

Vital Tools

  • Drill Press for drilling holes in rails and brace pieces, I used a bench-top model and set it on the ground and used makeshift cribbing and the other pieces of angle iron to make a race to slide the rail being drilled.
  • Metal cutting device, I used an angle grinder and abrasive cutoff wheels.
  • Tubing Bender, I used the DY-12 bender from Lost Creek Greehouse, the same or very similar bender is being produced by Lost Creek for Johnny’s and sold in their catalog. Usually Lost Creek has better shipping, it was free when I bought ours.
  • Small Tubing Bender for bending the “Gothic Arch” ,this you have to DIY. I will try and get info about this up soon but there are better methods than the way we did it.
  • Cordless Screwgun/Drill
  • Rugged flat surface for bending hoops
  • Flat surface for assembling hoops
  • Hammer
  • Heavy metal object with a flat surface to use as an anvil, an actual anvil would be awesome, a splitting wedge or splitting maul driven into a chunk of wood was what we used.
  • Metal marking punch
  • Drill bits
  • 5/16ths ratchets and wrenches

Helpful Optional Tools

  • Fencing Tool
  • Vise-Grip pliers
  • Ratcheting Box wrenches (these really speeded things up when we bought a couple)

Metal Cut List:

Part Stock No. Length Holes Bend?
Half Bow Toprail Tube 26 10’ NA YES
Arch Piece Toprail Tube 13 5’ NA YES
Ridge Pole Toprail Tube 5 10’ NA NO
Purlin ¾” EMT Conduit 10 10’ NA NO
Wind Brace 1/2” EMT Conduit 12 10’ 2 YES
Short Truss Piece 1/2” EMT Conduit 9 3.5’ NA NO
Long Truss Piece 1/2” EMT Conduit 4 4.5’ 2 NO
Endwall Brace 1/2” EMT Conduit 4 5’ 2 NO
Long Rail 2X2 Angle Iron 4 20’ 12 NA
Short Rail 2X2 Angle Iron 2 10’ 8 NA
Rail Splice 2X2 Angle Iron 4 2’ 4 NA

Wood Cut List:

PartStockNo.Length
Hipboard1x41010’
Hipboard Splice1x4818”
Endwall Hipboard1x444’
Endwall Anchor Brace1x445’
Endwall Frame1x486’
Peak Gusset1x4 or plywood218
Lintel2x428’
Door Post2x445.5’
Endwall Anchor2X442.5’

Also see the wiki for the independent wheel assemblies