If you’ve ever wanted to have a greenhouse in your yard, but it’s out of your price range, you can build your own recycled plastic two-liter bottle greenhouse. This simple to build greenhouse use basic pressure treated lumber to construct the frame and two-liter plastic bottles for the clear panels. Its simple construction makes it the perfect project for kids and adults alike.
Step One: Gathering Supplies
This is probably the most difficult of all the steps for building a greenhouse from two-liter plastic bottles. You’ll need a lot of bottles, depending upon the size of your greenhouse. An 8×8 greenhouse will take about 2,000 or more two-liter bottles. Recycling centers, school functions and charity events can help you to gather enough two-liter plastic bottles for this project.
Step Two: Washing and Cutting
Remove the screw on tops from the two-liter bottles. Next, wash the bottles in warm, soapy water and peel off all of the labels. This can be done in a tub or bucket. Let them dry for a few hours in the sun, then begin cutting off the bottoms of the bottles with a pair of scissors. This part can be extremely time consuming and painful to your hands. It’s best if you can get plenty of volunteers help out with this process.
Step Three: Setting the Posts
This part of the recycled two-liter bottle greenhouse project is best done by adults. 4×4 posts work best for corner supports and should be set into the ground vertically and cemented in place. Use the 3-4-5 method for making the posts square. Measure three feet in one direction, then measure four feet perpendicularly to the next post and mark the two spots on the ground. Now measure the distance diagonally between the two marks. If it equals five feet, then the posts are square. Make adjustments as needed on the three foot and four foot marks.
Step Four: Building the Frames
The frames should be made from 2×4 pressure treated boards and attached together with mitered corners and woodscrews. They don’t have to be complicated as long as they fit squarely between the 4×4 posts. Create two gable ends using the same materials.
Step Five: Stacking the Bottles
Using a ½” dowel that is cut to the frames length, insert a plastic two-liter bottle onto the dowel facing cut side up and slide it to the bottom, resting it on the ground. Now slide additional two-liter bottles, right side up so that each bottle fits tightly into the last one. Fill up the entire dowel with bottles. Secure them in place at each end with a small screw.
Step Six: Attaching the Bottles to the Frame
Now attach the tubes of bottles to the 2×4 frame using woodscrews or a large fencing staple. Push the tubes up tight against each other and squarely as possible onto the frame. Fill up each frame with as many tubes as possible, and then attach the frames to the 4×4 posts using woodscrews.
Step Seven: Building the Greenhouse
Once you have the frames set up against the 4×4 posts, the walls are complete. A door can be set into on of the frames by building a smaller frame and affixing it with hinges. The roof of the structure can be either flat or sloped. Building one side of the greenhouse two feet higher than the other side allows the roof to slope enough. Attach bottles to dowels in the same fashion as the walls for the perfect roof to your new two-liter plastic bottle greenhouse.