First off - this is not my original idea. The inspiration for this came from another instructable on here located at this link: https://www.instructables.com/id/Geodesic-Dome-Greenhouse/
The kids at the original link are really the inventors and inspiration behind this.
My idea was simple: Seeing how they did it, I wanted to do it too, but spend no money on it and use recycled materials in the process.
I managed to do that in quite a bit of it, and had to buy staples to attach the plastic to the frame. All in all I spent about $8 on staples but the rest came from recycled materials and other things I had laying around.
This was an experiment and it failed for several reasons. In the last step I'll discuss what I learned from this, what I would do differently, and where improvements could be made to make this a success.
I am putting this up here to show that it can be done with a minimal cash investment, and some time and ingenuity.
Also, it's a "See what I made sort of thing" that my wife thought I should put up here, so I am doing that at long last.
Another point I wish to make- This is a failure. Yes! I am posting this here to show that we will all have failures and that we can't get discouraged from it, but can move on and learn from them. This is my failure that I'm choosing to share with all of you and hopefully help in some way to encourage others to fail more often, more spectacularly, and with more energy than I!
Enjoy and comments, suggestions, and questions are ecouraged so we can all learn from this!
Step 1: What You Will Need: Stuff!
To make this greenhouse dome I used several items in the construction that I had easy access to or had around already.
Wooden slats & strips of at least 4 feet in length-
You will need 35 pieces at 48" long
You will also need 30 pieces at 42" long
For the door you will need 7 pieces at least 5' long.
For stakes you will need about 20 to 30 - 18" pieces.
For the strips I used about 50 of them in all and they varied in length from 6 to 10 feet.
(I got these free at a cabinet maker near me that sets them out as scraps for the public on the weekends. If you check your area for such companies they may have scrap bins you can dig through if you are polite and clean up after yourself.)
Aluminum Wire - (I used a roll I bought years ago of aluminum electric fence wire.)
1 1/2" screws - (I salvaged most of these from wood people gave me. I put them in an old coffee can for things like this)
6mm Plastic - (I get mine from a fiend in construction and it was scraps left-over after various jobs that he saved for me.)
Staples for a staple gun - (the only thing I bought)
Some Nails of at least 2 1/2 inches (salvage again)
Plastic coffee can lids (at least 6 of them)
A razor or knife
Pliers with a wire cutter or needle nose pliers
Step 2: Cut & Drill Your Wood.
Once you have your wood cut them to 35 pieces that are 48" long and 30 pieces to be 42" long.
I used a jig saw and accomplished this fairly quickly - Make sure you keep them separate as they are for two different things.
Once all your pieces have been cut use a drill with a 1/8" bit to drill a single hole in each end of the 42" pieces.
Next drill two holes in each end of all the "48 inch pieces.
You can alternate the directions of the holes and when working with soft wood I recommend alternating the direction of the holes.
Once done with all this you are ready for the next step.
Step 3: Start to Assemble Your Pentagon Centers.
To make this geodesic done greenhouse you are going to make 5 pentagons with centers made out of 42" pieces and the outer edge made of 48" pieces.
To attach all these I am using Aluminum electric fence wire because I had it on hand, it is very strong and easy to work with.
Start by laying out 5 pieces of 42" slats in a star shape and run a wire through the holes at those ends.
When all of them are "laced" together, twist the wire together at the end - Make sure to leave a little slack to allow them to move a bit.
At first I trimmed the excess wire, but as I would over twist or break wires it was easier to leave the excess on for now and just curl it up and against the center of the star.
Do this 6 times. The last set of center-slats will need to placed aside for now.
Step 4: Make Your Pentagons.
To make the pentagons you take your 48" pieces and attach them to the outer edges of the star to make a pentagon.
From the measurements and the pictures above, you can see that it will be necessary to Pop up the center of each pentagon to complete it.
Repeat this process until you have 5 completed pentagons.
Note: you will have one center piece left over and a few boards of 48" long left over- they will be used for the next step.
With the completed 5 pentagons, take your coffee can lids and screws. You are now going to reinforce each pentagon center.
Cut the coffee can lid from edge to the center and then overlap one edge over the other. This will make a slight cone to attach to the center.
Screw the coffee can lid to the center of the frame with one screw for each of the 5 star legs. I overlap the edges of my cut pieces until the lid touches all the legs.
Step 5: Assemble Your Dome!
With the five pentagons completed it is time to start assembling the dome.
(Sorry, My camera ran out of batteries at this point and I didn't get new ones until I took a break.)
Take two pentagons and wire one corner to the corner of another pentagon.
Attach a third pentagon to the previous two - moving in a circle - to the outside corner.
I used some help at this point as I had to stand the frame up.
Wire the fourth and fifth pentagons to the frame completing the circle and wire the fifth pentagon to the first to complete the basic start of your dome.
Once this step is completed wire the remaining 48" pieces to the spots on the ground to join all five pentagons together at the ground level and help keep the dome upright.
After all this is done grab the remaining star set of 42" pieces. Attach this to the top of each pentagon in the center to make the top of your dome.
Once done, stand back and admire your work. Have some iced tea- and if you are like me, go get some new batteries for your camera and wonder what the Heck you got yourself into!
Step 6: Making a Door for the Greenhouse!
To get into and out of the greenhouse I chose the weakest and flimsiest pentagon of the dome and cut out the center - removing the lid reinforcement.
Taking 3 of my 5' sections I laid them against the dome frame of this pentagon and marked where I wanted them to attach to the frame.
Next I cut the door frame to match and screwed it to the frame.
With the door frame on I took the legs of the center of the pentagon and cut them to pit against the door frame.
Once the legs are cut I screwed them to the door-frame and reinforce the edges of that pentagon again.
With that completed take your 4 remaining 5' pieces and hold them up to the door-frame you just created. Mark each piece if you need to and cut them. Once completed you screw these pieces together and using the left over scrap make some braces in the corners for the door to reduce wobbling.
Taking two of your hinges attach the door to the frame and make sure it can open and close easily.
Step 7: Stake Down the Greenhouse!
At this point I made a mistake and didn't do this step until after I had covered my greenhouse. That turned out to be a problem as a Kansas wind-storm upended it and caused damage to a lot of the plastic. After recovering it I realized I needed to stake this thing down..
At this point take 5 of your 18" stakes and cut one end with to a point.
Using a hammer, drive them into the ground around the outside of your greenhouse.
(Note: because I know someone is going to say it- Dial before you dig or go driving random stakes in the ground to make sure you don't hit your water line, gas line, an underground electric line, or the sewer line! Always be safe and make sure you know what is under you when you dig or drive things into the ground!)
Nail each stake to the frame of the greenhouse.
Step 8: Time to Cover the Dome!
To cover the dome I used some clear 6mm plastic I got for free from a friend in construction.
These started life as large sorts of garbage bags but I cut each one at the outer edges and used them to attach to the frame with a staple-gun.
As you can see in some of the pictures I had to use a step-stool to get to the very top of the Dome.
Also, in the windy Kansas weather (where the wind never seems to stop!) I had some help from my daughter to hold down the plastic as I was putting it on. I cut off excess plastic with a knife as I went.
Keep doing this until the dome is entirely covered. -- except for the door way! Instead cut some plastic to fit around your door in the inside and outside and with 6" excess on all sides. Staple it to the door on the front and back - leaving the excess hanging off. This excess will for a sort of seal for the doorway and keep the air inside pretty warm.
Step 9: Installing a Vent
I installed a vent to help keep the heat at bay during the day.
I used some scrap slats and cut three of them to fit inside one of the triangles on the top.
Next I cut out the plastic there and attached plastic to the outside of my new triangle.
To prob the vent up, I cut another slat and attached it with a screw to the top of the triangle and then attached screws to it along various parts so I could adjust how far I had the vent open.
Again, I left an excess of about three inches on all sides to form a seal when closed.
On the frame inside I placed a few screws to keep the vent from falling inside when closed and one at the top near the adjustment stick to put the screws on when open and give it a place to rest.
I attached the vent with the remaining two hinges and then I was done.
Step 10: Building a Grow Area
One thing not in the orginal design and I thought could be better was a dedicated grow area.
Once completed I took a shovel and scraped all the crabgrass and a couple of inches of the top soil from the entire of the inside.
Some of this I deposited out around the edge of the greenhouse along the ground to form a seal, and the rest I placed in low spots in the yard to even it out.
Next I took my remaining 15 stakes and drove them into the ground, forming a tear-drop sort of shape from one side of the door frame around a center of the dome floor and around to the other frame.
After that was completed I wove a fence of sorts using thin pieces of wood strips and wove them in an out among the stakes in an alternating pattern from bottom to top. Then ends I tucked into the frame pieces of the door at the ground.
I didn't picture it with the top soil filled in and by the time it was done the entire project failed, but that will be covered in the last step.
Step 11: OPTIONAL - the Interior Pond!
One option I thought of and am quite proud of is the use of the pond I had lying around.
Our air conditioner runs all the time due to my mother-in-law having health problems that require a steady temperature in the home.
The result of this is that the drip line for the AC is constantly working and making a muddy mess at the corner of the house.
Since I had the pond, realized that the humidity would help the interior of the green-house, I figured a way to make use of both.
Using duct tape I attached an old garden hose to the AC drip line.
I ran the line along the ground, under the greenhouse edge, dug out a spot in the center of the greenhouse and placed the plastic pond liner in it.
With that done the water from the AC dripped along the hose and into my pond, filling it in a couple of days and dried up the continuous mud-hole it had previously created!
Step 12: I'm Done- Now What????
With the greenhouse completed I managed to secure a few truck loads of soil for the interior growing area and filled in it.
I built this in June of 2011 and then we had one of the hottest summers on record. For months this thing sat out in the heat and weather, unused because the temperatures inside would soar to 130 to 140 degrees F. quite often!
As fall came on one wind-storm and then a thunderstorm too many proved that this became a failure for many reasons!
The first problem was the plastic I was using was too thin and not made to take the hot summer sun, strong winds and UV rays. It fell apart all summer and I kept replacing it as needed - waiting for fall when I could finally use this thing!
The second problem was that the joints of the dome weren't strong enough for our winds and storms and continued to fall in on themselves. I think this problem could be solved with using tin cans instead of cheap plastic like I did and would be stronger overall if I reinforced all the joints this way.
Finally, the spot I chose was close to the street and several times I had to get kids out of it that would wander in from the sidewalk. I didn't mind the looking, but a few of them decided to poke holes and do other things to it that didn't help my already flawed and weak design. <sigh>
After a summer of frustration and one storm too many I finally yanked up the stakes and threw the whole thing in the trash heap, to be recycled as something else in bits and pieces and many of the wooden parts burned in my chimnea over the following winter!
I hope you enjoyed the process I went through and this inspired you to try something like this on your own. One thing I think I did successfully here was to prove I could build something from what others considered trash and make it work - if only for awhile.
I will probably build another greenhouse like this in the future and I know that this one taught me many things to do differently.
Please feel free to leave comments, suggestions and questions here for others to learn from as I think even our failures help us all build better in the future!