Diy Greenhouse Using Plastic Sheets

Have you ever wished you could grow your favorite tomatoes a little longer into the fall, or get a jump start on planting in the spring? A greenhouse can help! And you don’t need to spend a fortune. Building your own greenhouse using plastic sheets is a fun and affordable project. It lets you control the growing environment for your plants, protecting them from frost, harsh winds, and even pests.

Quick Answer: Building a DIY plastic sheet greenhouse involves planning your greenhouse size and location, gathering materials like lumber or PVC pipes and plastic sheeting, constructing the frame, attaching the plastic, and maintaining it properly. This lets you grow plants year-round, protect them from bad weather, and start seeds early!

Planning Your Plastic Sheet Greenhouse

Before you even think about hammering a nail or cutting a pipe, you need a plan. This is the most important step! Think about what you want to grow, how much space you have, and your budget.

Size and Location

How big should it be? Consider the types and quantity of plants you want to grow. A small greenhouse (6ft x 8ft) is great for starting seeds and growing herbs. A larger greenhouse (10ft x 12ft or bigger) can accommodate larger plants and more of them.

Where should I put it? The location is critical for sunlight. A south-facing location is ideal in the Northern Hemisphere, as it gets the most sun throughout the day. Make sure there are no trees or buildings blocking the sunlight. Also, consider access to water and electricity if you plan to use lights or a watering system. A relatively flat area is important for making construction easier.

Greenhouse Design

There are many different designs you can choose from. Here are a few popular options:

Hoop House: This is the simplest and most cost-effective design. It uses bent PVC pipes or metal conduit to create a rounded frame.

A-Frame: This design is more sturdy and provides more headroom. It is made with straight lumber pieces assembled to form an "A" shape.

Lean-to: This type of greenhouse is built against an existing wall, such as a house or garage. This can save on materials and provide extra insulation.

Gable Greenhouse: This is a traditional greenhouse design with a pointed roof. It is more complex to build but offers good ventilation and headroom.

Choose the design that best suits your needs, skills, and budget. If you’re a beginner, a hoop house is a great place to start.

Materials You’ll Need

Once you have a plan, it’s time to gather your materials. The materials will depend on the design you choose. Here’s a general list:

Framing Materials

Lumber: If you’re building an A-frame or gable greenhouse, you’ll need pressure-treated lumber for the frame. Pressure-treated lumber is resistant to rot and decay, which is important for a greenhouse environment. Consider using 2×4 or 4×4 lumber for the main structure.

PVC Pipes: For a hoop house, PVC pipes are a good choice. They are lightweight, flexible, and easy to work with. Choose Schedule 40 PVC pipes for durability.

Metal Conduit: Metal conduit is stronger than PVC and can withstand more wind and snow. It’s a good option for larger hoop houses or areas with harsh weather.

Connectors: You’ll need connectors to join the framing materials together. Use screws, nails, or metal brackets for lumber. For PVC pipes, use PVC cement and fittings. For metal conduit, use conduit clamps and screws.

Covering Material

Polyethylene Film (Plastic Sheeting): This is the most common covering material for DIY greenhouses. Choose a greenhouse-grade polyethylene film that is UV-resistant and at least 6 mil thick. This will protect your plants from harmful UV rays and prevent the plastic from degrading quickly.

Polycarbonate Panels: Polycarbonate panels are more expensive than polyethylene film but are much more durable and offer better insulation. They are a good option if you live in an area with extreme temperatures or want a greenhouse that will last for many years.

Other Essential Supplies

Screws, Nails, and Fasteners: Choose galvanized or stainless steel fasteners to prevent rust.

Measuring Tape: A measuring tape is essential for accurate measurements.

Saw: You’ll need a saw to cut the lumber or PVC pipes to size. A circular saw or hand saw will work for lumber. A PVC pipe cutter is best for PVC pipes.

Drill: A drill is useful for screwing in screws and making pilot holes.

Staple Gun: A staple gun is helpful for attaching the plastic sheeting to the frame.

Utility Knife: A utility knife is useful for cutting the plastic sheeting to size.

Gloves: Wear gloves to protect your hands while working.

Safety Glasses: Wear safety glasses to protect your eyes from debris.

Door and Venting Materials: Decide how you will enter your greenhouse and how you will ventilate it, then buy the door and venting materials according to your choices.

Constructing Your Plastic Sheet Greenhouse

Now comes the fun part: building your greenhouse! Follow these steps, adjusting them as needed based on your chosen design.

Building the Frame

Prepare the Ground: Clear the area where you will build the greenhouse. Level the ground as much as possible.

Build the Base: For an A-frame or gable greenhouse, build a rectangular base using pressure-treated lumber. This will provide a stable foundation for the greenhouse. Secure the corners with screws or nails. For a hoop house, you can skip this step or build a simple ground frame using lumber or stakes.

Assemble the Frame: Assemble the frame according to your chosen design. For an A-frame or gable greenhouse, build the side walls and roof supports. For a hoop house, bend the PVC pipes or metal conduit into arches and secure them to the base.

Add Bracing: Add bracing to the frame to make it more sturdy. Use lumber or metal straps to connect the frame members together.

Attaching the Plastic Sheeting

Measure and Cut the Plastic: Measure the frame and cut the plastic sheeting to size, leaving a few extra inches on each side for overlap.

Attach the Plastic: Start at the top of the frame and work your way down, securing the plastic to the frame with a staple gun. Stretch the plastic tightly as you go to avoid wrinkles and sagging. Use staples every few inches to ensure a secure hold.

Secure the Edges: Fold the edges of the plastic over and staple them to the frame for a clean and secure finish.

Install Doors and Vents: Cut out openings for the door and vents. Install the door and vents according to the manufacturer’s instructions.

Reinforcing the Structure

Once the plastic sheeting is installed, it’s important to reinforce the structure to withstand wind and snow.

Add Strapping: Use metal or nylon strapping to wrap around the greenhouse and secure the plastic to the frame.

Bury the Edges: Bury the edges of the plastic in the ground to prevent wind from getting underneath.

Use Sandbags: Place sandbags around the base of the greenhouse to provide extra weight and stability.

Maintaining Your Plastic Sheet Greenhouse

Once your greenhouse is built, it’s important to maintain it properly to ensure its longevity and effectiveness.

Ventilation

Open Vents Regularly: Open the vents regularly to allow fresh air to circulate and prevent the greenhouse from overheating.

Install a Fan: Install a fan to circulate the air and prevent stagnant air pockets.

Consider an Automatic Vent Opener: An automatic vent opener will automatically open and close the vents based on the temperature inside the greenhouse.

Temperature Control

Use Shade Cloth: Use shade cloth to reduce the amount of sunlight entering the greenhouse during the hottest part of the day.

Install a Heater: Install a heater to keep the greenhouse warm during the winter months.

Use a Thermostat: Use a thermostat to control the temperature inside the greenhouse.

Cleaning

Clean the Plastic Regularly: Clean the plastic sheeting regularly to remove dirt and debris. This will allow more sunlight to enter the greenhouse. Use a mild soap and water solution.

Remove Weeds: Remove weeds from inside the greenhouse to prevent them from competing with your plants for nutrients.

Repairs

Repair Tears and Holes: Repair any tears or holes in the plastic sheeting as soon as possible to prevent further damage. Use greenhouse repair tape or replace the damaged section of plastic.

Tighten Fasteners: Tighten any loose screws, nails, or staples.

Seasonal Adjustments

Winterize Your Greenhouse: In the fall, prepare your greenhouse for winter by insulating it, adding a heater, and reinforcing the structure.

Prepare for Summer: In the spring, remove any insulation, add shade cloth, and ensure adequate ventilation.

Choosing the Right Plastic Sheeting

Choosing the right plastic sheeting is essential for the success of your greenhouse.

Types of Plastic Sheeting

Polyethylene (PE): The most common and affordable option. Look for UV-resistant PE film that is at least 6 mil thick.

Polycarbonate: More expensive but more durable and provides better insulation. Comes in rigid panels.

Polyvinyl Chloride (PVC): Less common for greenhouses but offers good clarity and durability.

Infrared (IR) Film: Helps to retain heat inside the greenhouse.

Anti-Condensate (AC) Film: Reduces condensation inside the greenhouse.

Factors to Consider

Thickness: Thicker plastic is more durable and provides better insulation.

UV Resistance: UV resistance is essential to prevent the plastic from degrading in the sun.

Clarity: Choose a plastic with good clarity to allow maximum sunlight to enter the greenhouse.

Cost: Consider your budget when choosing the type of plastic sheeting.

Greenhouse Ventilation: Why It’s Important

Ventilation is crucial for a healthy greenhouse environment. Without proper ventilation, your plants can suffer from overheating, humidity buildup, and disease.

Benefits of Ventilation

Temperature Control: Ventilation helps to regulate the temperature inside the greenhouse, preventing it from overheating.

Humidity Control: Ventilation helps to reduce humidity levels, which can prevent fungal diseases.

Air Circulation: Ventilation promotes air circulation, which helps to distribute carbon dioxide to the plants and prevent stagnant air pockets.

Pollination: Ventilation can help to pollinate plants by carrying pollen from one plant to another.

Types of Ventilation

Natural Ventilation: This involves opening vents and doors to allow fresh air to circulate.

Forced Ventilation: This involves using fans to circulate the air.

Roof Vents: Roof vents are located at the top of the greenhouse and allow hot air to escape.

Side Vents: Side vents are located on the sides of the greenhouse and allow cool air to enter.

DIY Greenhouse Heating Options

Heating your greenhouse can extend your growing season and protect your plants from frost.

Types of Heaters

Electric Heaters: Electric heaters are easy to install and use. Choose a heater with a thermostat to control the temperature.

Propane Heaters: Propane heaters are more powerful than electric heaters but require a propane tank.

Natural Gas Heaters: Natural gas heaters are a good option if you have a natural gas line.

Kerosene Heaters: Kerosene heaters are less common but can be a good option for small greenhouses.

Solar Heating: Passive solar heating involves using the sun’s energy to heat the greenhouse.

Tips for Heating Your Greenhouse

Insulate Your Greenhouse: Insulate your greenhouse to reduce heat loss.

Use a Thermostat: Use a thermostat to control the temperature inside the greenhouse.

Heat Only When Necessary: Heat your greenhouse only when necessary to save energy.

Frequently Asked Questions (FAQ)

Q: How much does it cost to build a plastic sheet greenhouse?

A: The cost varies depending on the size, design, and materials you use. A small hoop house can cost as little as $100 to $200. A larger A-frame or gable greenhouse can cost $500 or more.

Q: How long will a plastic sheet greenhouse last?

A: The lifespan of a plastic sheet greenhouse depends on the quality of the materials and how well you maintain it. With proper care, a plastic sheet greenhouse can last for several years.

Q: Can I build a greenhouse on a sloped area?

A: It’s best to build a greenhouse on a level surface. If you have a sloped area, you may need to level the ground or build a raised foundation.

Q: How do I prevent condensation inside my greenhouse?

A: Proper ventilation is key to preventing condensation. Open the vents regularly to allow fresh air to circulate. You can also use anti-condensate film.

Q: What plants grow best in a plastic sheet greenhouse?

A: Many plants thrive in a plastic sheet greenhouse, including tomatoes, peppers, cucumbers, lettuce, herbs, and flowers.

Q: How do I protect my greenhouse from strong winds?

A: Reinforce the structure with strapping, bury the edges of the plastic, and use sandbags for extra weight and stability. Choose a location that is sheltered from strong winds if possible.

Conclusion

Building a DIY plastic sheet greenhouse is a rewarding project that allows you to extend your growing season and protect your plants. By following these steps and maintaining your greenhouse properly, you can enjoy fresh vegetables and beautiful flowers year-round. Don’t be afraid to experiment and customize your greenhouse to suit your specific needs and preferences. Happy gardening!