User avatar
tomf
Super Green Thumb
Posts: 3227
Joined: Mon May 18, 2009 12:15 pm
Location: Oregon

Construction of a poly-tunnel greenhouse. W/ photos

I put together a poly tunnel greenhouse and I showed how I did it in photos if you wish to try and make one. This sort of greenhouse is inexpensive, easy to put up, and scalable to what size you need. You can also modify the construction to suit your needs.
First I decided on what size I needed, this one is 19 feet long by 14 feet wide. For this size I used one inch PVC pipe. I used two ten foot pipes and two 2 1/2 half foot pipes. I connected the ends with tees and the center arches with cross tees. I ran a pipe lengthwise at the top to strengthen and tie the arches together. I also added a pipe vertically to the ends for extra strength. If you are going much smaller then ¾ inch pipe may work for you.
I glued the pipe together and lined it up where I wanted the greenhouse. I then drove a 2 to 3' piece of rebar into the ground at one end of the greenhouse, and next to the pipe I had laid out. The rebar is for the pipe to slide over, this holds the pipe in place and secures the greenhouse to the ground. I then drove another section of rebar next to the other end of the greenhouse and ran a rope to line up the center sections of rebar; driving rebar next to them. Then measured the other side and did the same there. When the rebar was in the ground I started at one end and slid the pipe over it, working my way from side to side to the end of the greenhouse.
I also used a length of rope to tie the arches together making them sturdier.
For plastic covering I went to a farm supply store as they sold plastic sheeting in 20' widths, and I got a 20'x50' roll of 6 mill plastic for $60. The stuff I found in the hardware stores was less expensive but it was 10' wide at 6 mills. Ten foot wide was not what I was after; it could work on a smaller version of this green house.
To pull the plastic sheet over the top of the greenhouse I placed a length of 3/4 " pipe on one end of the plastic sheet to use as a way to pull the plastic up and over the one inch pipe. I taped rope to do this and pulled it up like a sail. I used outdoor duct tape to secure the plastic sheathing. A friend who likes the idea said he was going to try using grummets and tied the plastic sheet down.
On this greenhouse I added a gate and used deer fence to let air flow through and keep out the deer.


Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image
The things I do are an evolution and I am always learning. My way is not the only way of doing things, and I may and will change the way I do things as I learn better ways. So any advice that I give is in that spirit.

pepperhead212
Greener Thumb
Posts: 1434
Joined: Wed Oct 15, 2014 5:52 pm
Location: Woodbury NJ Zone 6B

Re: Construction of a poly-tunnel greenhouse. W/ photos

Great job, Tom! I wish I had a large enough area to put one of those in; I now put a mini-tunnel together for the fall and winter, then use the area for other plantings, come spring. Still considering one, however.

How high are the arches?
Dave

User avatar
digitS'
Super Green Thumb
Posts: 3458
Joined: Sun Sep 26, 2010 5:10 pm
Location: ID/Wa! border

Re: Construction of a poly-tunnel greenhouse. W/ photos

The plastic film is being held down by being glued to rope ...

Do I understand that right, Tom?

My tunnels are such temporary things. One is only up for about 8 weeks. It's actually a little more secure than the other one since there is a 2 by 4 frame and lathe holds it. The other has lathe holding it also but only around the window and door frames. Bricks laid along the edges hold it ... somewhat. I have to go around after wind gusting above about 30mph and readjust. Those window and door frames and rope crisscrossing over the top keep it from taking off, skyward.

Steve
But relax and do not rue:

For the Other, too 'tis You! ~ Peter Rosegger

User avatar
tomf
Super Green Thumb
Posts: 3227
Joined: Mon May 18, 2009 12:15 pm
Location: Oregon

Re: Construction of a poly-tunnel greenhouse. W/ photos

It is 8 feet high. The rope only ties the pipes in the arch together, i used duct tape to hold the plastic sheet on.
The things I do are an evolution and I am always learning. My way is not the only way of doing things, and I may and will change the way I do things as I learn better ways. So any advice that I give is in that spirit.

  • Similar Topics
    Replies
    Views
    Last post
  • What to do with Double Poly Greenhouse in Summer?
    by urbanfarmer-windsor » Fri Mar 10, 2017 7:24 pm » in Greenhouse Forum
    0
    808
    by urbanfarmer-windsor
    Fri Mar 10, 2017 7:24 pm
  • Looking to put up a greenhouse
    by Raine » Mon Oct 26, 2015 3:57 pm » in Greenhouse Forum
    7
    9614
    by babybirdblue
    Tue Nov 10, 2015 8:02 pm
  • My New Greenhouse
    by JosephsGarden » Sun Nov 29, 2015 2:08 am » in Greenhouse Forum
    12
    4077
    by lakngulf
    Sun Jan 24, 2016 4:01 pm
  • New greenhouse
    by Susan W » Fri Feb 05, 2016 9:49 pm » in Greenhouse Forum
    6
    3247
    by Allyn
    Wed Mar 23, 2016 2:26 pm
  • My first Greenhouse
    by amrap1956 » Sun Nov 05, 2017 9:53 pm » in Greenhouse Forum
    7
    905
    by MoonShadows
    Tue Dec 26, 2017 11:23 pm
  • Starting a Greenhouse
    by Leeds78 » Fri May 01, 2015 2:03 am » in Greenhouse Forum
    0
    1745
    by Leeds78
    Fri May 01, 2015 2:03 am

Return to “Greenhouse Forum”