First off…the greenhouse to the left is NOT what I am talking about. That greenhouse probably cost way more than my house did! It was just a nice picture and maybe just a bit of a trap for you.
What I am really talking about is a that anyone can build with limited tools, knowledge, and skills. A greenhouse that gets the job done at minimal cost, time, and effort. Something that every man can build and use.
I didn’t have any plans to go by before I started. I just had looked online at a couple others that are similar. Why no plans? Because I just wanted to see how easy it could be, how simple it could be.
I don’t need more space that to start about 70 – 80 plants. Why? Coz where I live there is only about 3 month growing season that you can 100% count on. Normally you can get 4 – 5 months but that isn’t assured. By starting plants indoors a couple months ahead of time you get a nice jump on growing season.
Based on the size of my garden (raised beds) and using the square foot methodology I only need to start maybe 70 – 80 plants. But, I also want to start about 20 Afghan pine trees as well. I figured a 6′ plastic table from Walmart should do it. The pines will trees will go on the ground when they get about 6″ tall. All that being said I figured a 7′ x 8′ usable floor plan would be plenty of room. I also wanted it plenty tall enough to comfortably stand up in. One additional issue, wind. We have some pretty strong wind events in the spring, it needed to stand up to that.
For the sides and top I decided on 16′ cattle panels. The are relatively inexpensive, $30 each. Plus they are made for outdoor use, are pre-assembled, and very strong when bent in a hoop form. And yes, I got the idea from others online. Doing some calculating I thought the height would only be about 6′ without adding any wood lifting up the sides of the panels. So the I added 2 levels of 2″ x 6″ dimensional lumber to the sides. The upped the sides by 15″ givingme a nice 7′ headroom clearance inside the greenhouse.
To create the corners I went with a standard 4″ x 4″ pressure treated wood post. The bottom row of wood that is in contact with the ground is 2″ x 4″ pressure treated wood.
So I laid it out real simple…
I laid it out just to get an idea of the footprint.
I used my Ryobi P234G impact driver. I also used deck screws. Why? because they are specifically made to be used outside, under stress, and hold firm. I used 3″ to make sure I had as much screw as possible to hold everything together.
Tip: Drive your screws in at a slight angle. This will make them hold even better.
I built the long sides first, on the ground where it was easy.
Then I just connected the sides with a 2″ x 4″ board. Notice I left about 9″ of the 2″ x 4″ on the left side hanging over. I will use that to “strap” down the windward side of the greenhouse making it a bit more resistant to the wind.
Then using 1″ x 3″ boards I added a lip to the outside of long sides. I wanted about 1″ of lip sticking above the side board material. If I were to do it again I would use 1″ x 4″ boards to make them a bit more secure.
I used these “lag” style screws to hold the 1″ x 3″ boards in-place. I also pre-drilled the holes through the 1″ x 3″ boards to make sure I didn’t split them. I picked up this screw in the clearance area of Lowes…great deal!! And they are really strong!
Now you can see the purpose of the “lips”, they hold the cattle panels structurally in-place from squirting out. But I wanted them even more secure.
I hope you can see that I used 3/16-in Zinc-plated Steel One-hole Strap Conduit Fittings. That little silver thingy. There will a better picture in a minute.
Here’s what I used to put them into place.
This is what it looked like with the panels in place. Notice I zip-tied the two panels together in the middle where they met up. I figured it would give them more strength connected like that.
Next came the ends. Also note, this is a better picture of the one-hole straps to hold the panels in-place. Notice I started the screws with the board laying down before I put them into place. The reason for the screw in the 4″ x 4″ is to support the 2″ x 4″ in-place so I am not trying to hold it level and drive the screw in at the same time. The 2×4 just sits on it pretty as you please.
Building the ends was pretty much a guessing game. This is the end that will have a window for ventilation but it also had to be sturdy enough to hold up structurally. See how the cattle panel end sits on the wood structure? Later you will see where I put a 2″x4″ beam in on the top for added weight structure if it got snow on it and it didn’t melt fast enough or just fall off.
Here’s what it looks like with both ends done, the beam put in, and the foam pipe insulation on the cattle panel exposed ends. And I also put Gorilla Tape on the seam where the two panels connect. Before I put the on I trimmed the zip ties.The pipe insulation is for 1/2″ pipe and the self-sealing kind. Yes, you will have to do a little cutting out around some of the wood.
The door opening is for the screen door to fit on the outside of the frame. If you want it to fit like a normal jam it is up to you. Yes, I could have cut the cattle panel end off to line-up with the edge of the wood framing. But as I said, I wanted this to simple and minimal. Also note, I didn’t use any framing on the sides, just the ends. The cattle panels give it enough support…I assume.
Here is a close up of the pipe insulation installation.
Here is how I put the Gorilla Tape on.Yes, I wanted to protect the plastic. And yes, it also gives some added strength to the panel joint.
And now comes the plastic. But, I didn’t want to use just any old plastic. I looked online for greenhouse plastic, found it. UV resistant, 6mil, blah, blah, blah. I found a greenhouse supplier with the right product, cost about $80 with shipping for a 20’x28′ custom cut piece. Ouch! So I decided…what-the-heck…I looked on HomeDepot. Same thing for $58 and free shipping. But, it was on sale so I ended up paying $35. Lesson learned: shop around.
Why 20’x28′ for a 7.5′ x 8′ greenhouse? When you measure the length from ground to ground over the 16′ cattle panels it came to almost exactly 20′. Then you consider the length of the greenhouse is 8′ plus two 7′ ends that came to 22′. Then I wanted enough left over for any mistakes and to cover the screen door.
On a non-windy day I got the plastic into place quite easily.
Then I strapped it down with these 20′ long 1″ straps from Amazon. I will post a picture of them directly below.
If you < click here > you will be taken to Amazon in a new window. If you purchase the straps this way I will earn about about 54cents…and I will appreciate it. You can also < click here > as well.

Notice how the strap ratchet is up against the wood and not just against the plastic? That is to help protect the plastic. Later I will put a couple layers of Gorilla Tape between the ratchet and the plastic to further protect it.

You can use these to connect the strap hooks to the wood. If you < click here > you will be taken to Amazon in a new window. If you purchase the tie downs this way I will earn about about 27cents…and I will appreciate it. You can also < click here > as well.
Here is where the fun starts…NOT! Figuring out how to fold the plastic into place is like wrapping a odd shaped Christmas present…good luck. You can see how I did it and it ain’t real pretty but it works.
You can see where I cut out the area inside where the window will go. But you can also see where I left enough plastic to wrap around the 2″x4″ window framing to help keep it in-place.
I did pull it snug, not tight. The pipe insulation gives you some cushion to play with. Also, notice I used roofing nails.
! DO NOT USE STAPLES !
If you use staples they will probably pull out over time…and will ripe your plastic as they do so. The roofing nails below will give you a much happier plastic.
And yes, you notice I used a couple of 1″x2″ furring strips horizontally to give the plastic more support. If you put the structural 2″x4″ on the outside vs the inside, then you won’t have to worry about the furring strips.
If you < click here > you will be taken to Amazon in a new window. If you purchase the roofing nails this way I will earn about about 8cents…and I will appreciate it. You can also < click here > as well.
Wrapping the plastic on the door end was much easier and more intuitive. Just wrap any way you want to as long as you are happy with it. I also cut out the area inside the door frame/jam area. If you don’t, then wind can build up pressure against it and potentially cause some damage.
At this point I was done for the day and the forecast showed bad weather for the next week. So all work has stopped on it for now. I will pick it back up in Part #2 once I can get back after it.
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