Alexei Volkov
Greenhouse plastic is prone to damage from chemical reactions, temperature, and friction. One of the most common issues is the plastic collapsing in strong winds due to the loose fit between the metal poles and plastic connectors. To protect greenhouse plastic from PVC, it is essential to address these potential sources of damage. This includes reinforcing the base with garden pegs, using suitable ropes, and ensuring the structure is firmly fixed to the ground. Additionally, it is important to consider the chemical reaction between PVC and polyethylene, which can cause the plastic to turn white and degrade over time. To mitigate this, one can use tape, such as felt tape, to create a barrier between the PVC and the plastic, preventing direct contact and subsequent chemical reactions.
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What You'll Learn
- Use acrylic-based paint to prevent chemical migration from PVC to plastic
- Apply felt tape to the frame to create a protective barrier
- Prevent abrasion by securing plastic tightly to a smooth frame
- Use UV-stabilized plastic to avoid degradation
- Reinforce the base with pegs and secure the frame to the ground
Use acrylic-based paint to prevent chemical migration from PVC to plastic
Polyethylene with hydrocarbon derivatives, when in contact with PVC, can be damaged over time. This is because PVC releases hydrogen chloride acid when exposed to high temperatures and UV radiation. To prevent this chemical migration from PVC to plastic, you can paint the PVC with acrylic-based paint.
Acrylic paint is ideal for this purpose because it can adhere to a wide range of surfaces, including plastic. It is also water-resistant and dries quickly, making it easy to work with. To ensure that the paint adheres properly, it is important to prepare the PVC surface before painting. This involves removing any dust, dirt, or grease that may prevent the paint from sticking. You can do this by wiping the surface with a clean, dry cloth and then washing it with soap and water.
Once the surface is clean and dry, you can apply a coat of primer to create a better surface for the paint to stick to. Then, using a small, soft-bristled brush, you can brush on the first coat of acrylic paint. It is important to use slow, steady strokes and to apply the paint evenly to achieve a smooth finish. After the first coat has dried, you can apply additional coats as needed until you reach the desired colour and coverage.
Finally, to protect the paint and ensure its longevity, you can apply a couple of coats of gloss acrylic varnish, followed by a thick coat of solvent-based urethane varnish or another outdoor-rated sealant. This will help to protect the paint from the elements and ensure that it withstands heat, pressure, and scratches.
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Apply felt tape to the frame to create a protective barrier
Greenhouse plastic is prone to damage from chemical reactions, temperature, and friction. PVC, a popular choice for greenhouses due to its efficiency, lightweight, flexibility, and inexpensiveness, can cause damage to the greenhouse cover over time. When exposed to high temperatures and UV radiation, PVC releases hydrogen chloride acid, which damages the greenhouse cover. Therefore, it is essential to create a protective barrier between the PVC frame and the greenhouse cover.
One effective solution is to apply felt tape to the frame. Felt tape, such as Americover's 1/4-inch-thick self-adhesive felt tape, acts as a cushion between the frame and the cover. It helps protect the cover from direct chemical reactions, prevents overheating and melting, and reduces friction against rough edges. The tape should be applied to any areas of the frame that come into contact with the cover, paying particular attention to rough edges or splinters that can cause abrasion.
When applying the felt tape, ensure that the frame is smooth and free of any debris. Clean the surface of the frame to ensure that the tape adheres properly. Carefully measure and cut the tape to fit the desired areas of the frame. Remove the adhesive backing and firmly press the tape onto the frame, smoothing out any air bubbles as you go.
It is important to note that the tape should be applied tightly to minimize movement. The greenhouse cover should also be secured tightly to the frame to prevent excessive movement that can cause abrasion. By creating a smooth and secure barrier with the felt tape, you can effectively protect the greenhouse plastic from direct contact with the PVC.
Additionally, combining this method with other protective measures can further extend the life of your greenhouse cover. For example, using UV-stabilized plastic sheeting made of polyethylene plastic can provide added protection from UV radiation. Proper reinforcement of the greenhouse structure, including securing it to the ground and using suitable ropes or weights, can also help withstand strong winds and external damage.
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Prevent abrasion by securing plastic tightly to a smooth frame
Greenhouse plastic can be protected from abrasion by securing it tightly to a smooth frame. This prevents movement, reducing the risk of tears and rips from friction.
To secure the plastic tightly, it must be pulled taut and held in place with a fastening. A common method is to use spring wire and lock channels, which are economical and form a tight and secure attachment. The spring wire is pulled through the lock channel, holding the plastic in place. This method is simple and effective, but it is important to note that the wire will need to be cut to size with bolt cutters or a metal saw.
Another option is to use snap clamps, also known as fabric or pipe clips, which attach the plastic to the PVC frame without the need for glue or drilling holes. These clamps can be made from a variety of materials, including ABS, which has not been found to negatively react with poly film.
To further protect the plastic from abrasion, tennis balls can be placed on pole ends when guiding the plastic over the structure. This prevents damage from the poles rubbing against the plastic.
It is also important to reinforce the base of the greenhouse with garden pegs or weights to prevent wind damage, which can cause abrasion as the plastic rubs against the frame.
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Use UV-stabilized plastic to avoid degradation
Using UV-stabilized plastic is a great way to avoid degradation of your greenhouse cover. While PVC is efficient, lightweight, flexible, and inexpensive, it can cause damage to polyethylene or greenhouse covers when exposed to high temperatures and UV radiation. Over time, PVC releases hydrogen chloride acid, which damages the greenhouse cover.
UV-stabilized plastic sheeting, on the other hand, is made of thick polyethylene plastic that has been treated with UV inhibitors. This type of plastic is designed to withstand intense sunlight and hold up under UV radiation without degrading. It is a popular choice among commercial farmers, hobby growers, and home gardeners due to its affordability and effectiveness in providing cover for many years.
When choosing UV-stabilized plastic, look for options that are 6 mil or thicker. Thicker plastic will provide better protection and last longer. Additionally, make sure the plastic is specifically designed for greenhouse use, as regular plastic sheeting from hardware stores may not have the necessary UV stabilizers.
By using UV-stabilized plastic, you can avoid the chemical reaction that occurs between PVC and polyethylene, preventing degradation and ensuring the longevity of your greenhouse cover. This simple choice can make a significant difference in maintaining the ideal growing environment for your plants.
To further enhance the protection of your greenhouse cover, consider using scrim reinforcement. Products like SolaScrimTM, made of laminated reinforced film with UV inhibitor layers, can be used in conjunction with UV-stabilized plastic to prevent rips and tears, providing additional strength and durability.
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Reinforce the base with pegs and secure the frame to the ground
Reinforcing the base of your greenhouse with pegs and securing the frame to the ground are essential steps in protecting your structure from strong winds and harsh weather conditions. Here are some detailed instructions to guide you through the process:
Prepare the Base:
Before setting up your greenhouse, it's crucial to select a level and sturdy surface for your structure. Clear the area of any debris, large rocks, or obstacles that might affect the stability of the greenhouse. Ensure the ground is compact and firm by tamping it down or considering a concrete base for added durability.
Reinforce with Pegs:
Garden pegs or stakes play a vital role in reinforcing the base of your greenhouse. Position the pegs at strategic points around the perimeter of the structure, driving them deep into the ground with a hammer or mallet. The number and placement of pegs will depend on the size and shape of your greenhouse, so ensure you have a plan or consult a professional if needed.
Secure the Frame:
Use strong and durable guy ropes or straps to secure the greenhouse frame to the pegs. Make sure the ropes are taut and tightly fastened to withstand wind pressure. You can also consider using weights, such as concrete blocks, or lumber to pin the frame to the ground for added stability.
Maintain and Inspect:
Regular maintenance is key to ensuring the longevity of your greenhouse. Routinely check the tension of the ropes and retighten them if necessary. Inspect the structure for any signs of wear and tear, especially after harsh weather conditions. Stay proactive in addressing any issues, such as loose panels, torn plastic, or damaged frames, to prevent them from becoming bigger problems.
Protect from Wind:
The wind is a significant threat to the stability of your greenhouse. Take precautions by reorienting the structure so that the prevailing winds don't directly hit the broad sides. Ensure that the plastic cover is tightly secured to reduce flapping and minimize wind entry. Regular maintenance of the cover and frame connections is also crucial to preventing wind damage.
By following these steps and maintaining your greenhouse, you can rest assured that your structure will remain standing strong for years to come.
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Frequently asked questions
Painting the PVC white with an acrylic-based paint can prevent the migration of chemicals from PVC piping to the greenhouse cover. Alternatively, you can use tape (felt, electrical, or clear duct tape) and apply it to the outside of the hoops where they come in contact with the plastic.
Reinforce the base using garden pegs, upgrade the supplied guy ropes to ones suitable for all-weather camping, reorient the plastic greenhouse away from prevailing winds, and pin the frame down to the ground with weights or lumber.
The best greenhouse plastic is UV-stabilized plastic sheeting made of 6 mil or thicker polyethylene plastic. It is affordable and able to provide cover for many years.
