Using clear tarps (also known as clear polyethylene tarps) for greenhouse construction can be a cost-effective way to cover your structure while allowing sunlight to penetrate. These tarps are particularly useful for creating a temporary or low-budget greenhouse while still providing essential light for plant growth. Here’s a step-by-step guide on how to use clear tarps for greenhouse construction:
1. Choose the Right Type of Tarp
- Material: Make sure the clear tarp is made of UV-resistant polyethylene to protect plants from harmful UV rays and prevent the tarp from degrading over time.
- Thickness: The thicker the tarp, the more durable it will be, but keep in mind that thicker tarps may reduce light transmission slightly.
- Size: Measure the size of your greenhouse frame to ensure the tarp covers the structure without gaps.
2. Prepare the Greenhouse Frame
- Frame Materials: You can use materials such as PVC pipes, metal tubing, or wood for the frame. Ensure the frame is sturdy and capable of withstanding wind, snow, and the weight of the tarp.
- For PVC pipe frames, create arches (hoop house style) or a basic rectangular frame, depending on your greenhouse design.
- For wood or metal frames, construct walls and a roof, leaving space for ventilation and entry points.
- Measure the Dimensions: Measure the height, width, and length of your frame, as well as the required overhangs where the tarp will be secured.
3. Install the Clear Tarp
- Position the Tarp: Lay the clear tarp over the frame, ensuring it covers the entire structure. The tarp should be centered so that it can hang evenly on both sides of the frame.
- Securing the Tarp:
- Attach to the Frame: Secure the edges of the tarp with rope, twine, or bungee cords. You can attach it to the frame using screws, nails, or clamps to hold it tightly in place.
- Tarp Clamps: For a more secure attachment, you can use specialized tarp clips or tarp clamps to keep the tarp firmly attached to the frame without causing damage.
- Overhang and Sealing: Leave some extra tarp on the edges to ensure that it covers the ground, preventing heat and moisture loss. You can use soil, bricks, or boards to weigh down the edges for a tight seal.
- Gable Ends and Roof: If your greenhouse has a peaked roof (gable style), fold the tarp over the ridge and secure it with clamps or ties. Make sure the tarp is tightly stretched across the roof to prevent sagging or pooling of rainwater.
4. Add Ventilation and Doors
- Ventilation: Proper airflow is crucial for plant health. You can cut small slits or install side vents that can be opened or closed to control humidity and temperature.
- You can also create roll-up sides with the tarp to allow better air circulation when needed.
- Doors: For easy access, you can create simple flap doors using more tarp material. Secure the top edges of the door opening and leave the bottom free for easy lifting.
5. Reinforce the Structure
- If you’re building a greenhouse for long-term use, consider reinforcing the structure to withstand strong winds or heavy snowfall. You can use windbreaks, extra support beams, or stakes to stabilize the frame.
- Tarp Maintenance: Regularly check the tarp for wear and tear, especially in areas where it’s secured tightly to the frame, and replace damaged sections as needed to maintain the integrity of the greenhouse.
6. Benefits of Using Clear Tarps
- Light Transmission: Clear tarps allow maximum sunlight to pass through, providing the plants with the necessary light for photosynthesis.
- Cost-Effective: Clear tarps are often much cheaper than other greenhouse covering materials like glass or polycarbonate panels.
- Flexibility: Easy to install and replace if necessary. Clear tarps can be used for both temporary and permanent greenhouses.
- Breathability: Polyethylene tarps are relatively breathable, helping prevent excessive condensation inside the greenhouse, though you may need to include vents for optimal airflow.
Conclusion
Using clear tarps for greenhouse construction is a budget-friendly and effective solution, especially for small or DIY greenhouse projects. They allow for good light transmission, are easy to work with, and provide basic protection for your plants. However, keep in mind that ventilation, proper securing, and maintenance are key to ensuring the tarp stays functional and your plants thrive in the greenhouse.
