Omar Khalid
The lifespan of greenhouse plastic sheeting depends on various factors, including the material used, local climate, and weather conditions. Polyvinyl Chloride (PVC) is a popular option for greenhouse plastic due to its durability and longevity, but it can degrade other types of plastic and is harmful to the environment. Ethylene-Vinyl Acetate (EVA) is another option with excellent mechanical and optical characteristics, superior flexibility, and UV resistance, but it is more expensive. The thickness of the plastic also affects its durability, with woven plastic being stronger and more puncture-resistant than regular plastic. Extreme weather conditions, such as heavy precipitation, extreme temperatures, high winds, and exposure to UV radiation, can cause the plastic to deteriorate faster, while the use of pesticides and chemical sprays can also accelerate deterioration.
| Characteristics | Values |
|---|---|
| Factors affecting deterioration rate | Weather and material |
| Weather conditions that accelerate deterioration | Extreme cold, heat, rain, snow, hail, heavy precipitation, high winds |
| Material that accelerates deterioration | PVC or polyester frames with polyethylene sheeting |
| Material that slows deterioration | UV inhibitors, felt tape, greenhouse repair tape, woven plastic |
| Plastic type that deteriorates slowly | Polyvinyl Chloride (PVC) |
| Plastic type that deteriorates quickly | Simple 4 mil poly greenhouse plastic |
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What You'll Learn
The impact of weather and climate
Secondly, extreme temperature fluctuations can cause the plastic to shrink and expand, leading to premature deterioration. This is particularly true in regions with harsh winters and hot summers. Additionally, high temperatures, especially when combined with UV radiation, can cause certain plastics, such as PVC, to release harmful chemicals that damage the greenhouse cover.
The local climate also influences the rate of deterioration. For example, in areas with heavy dirt and dust, the greenhouse plastic may accumulate dirt faster, affecting its lifespan. Similarly, regions with high tree coverage or branches may pose a risk of tears or punctures.
The choice of greenhouse plastic should consider the local climate and weather conditions. Woven greenhouse plastic, for instance, is ideal for areas with frequent thunderstorms and hail due to its strength and puncture resistance. Thicker plastics, such as those with a thickness of 6 mil or more, generally offer greater durability and can withstand harsher conditions.
UV protection is another critical factor influenced by climate. Plastics with UV inhibitors can withstand prolonged exposure to sunlight, preventing premature deterioration. However, even with UV protection, the lifespan of greenhouse plastics is limited, and they will eventually show signs of wear, such as scratching, yellowing, and cracking.
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The role of UV protection
UV radiation from the sun has ionization properties, meaning it can break down chemical bonds, causing deterioration in plastic sheeting. Over time, this radiation breaks down the polymers in the plastic, making it brittle, discoloured, and weak. Therefore, UV protection in greenhouse plastics is essential to prevent this degradation and extend the lifespan of the covering.
UV-resistant plastic sheeting is designed to block or partially block the UV spectrum, preventing the breakdown of the plastic. This protective feature is often achieved through the addition of UV stabilizers during the manufacturing process, which can extend the lifespan of the plastic by several years. Without this additive, the plastic sheeting can break down within months of exposure to sunlight.
The level of UV protection required depends on the specific needs of the plants being grown. For example, certain plants, such as roses and aromatic flowers, require some UV exposure to enhance their fragrance and colour. Additionally, UV light plays a role in plant growth, with higher light transmission rates promoting photosynthesis and, consequently, plant growth. Therefore, the UV protection of greenhouse plastics should be balanced with light transmission considerations to ensure optimal plant growth.
Furthermore, UV-resistant plastic sheeting offers additional benefits beyond plant health. It can reduce common greenhouse pests, such as whiteflies, aphids, and gnats. Moreover, the use of UV inhibitors and protective measures, such as felt tape, can further extend the lifespan of greenhouse plastic sheeting by preventing premature deterioration, tears, and exposure to extreme temperatures.
In conclusion, UV protection plays a critical role in maintaining the integrity of greenhouse plastics and creating an optimal environment for plant growth. By considering the specific plant needs and employing appropriate UV-resistant measures, growers can extend the lifespan of their greenhouse coverings while promoting healthy plant development.
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Material and thickness
The rate at which greenhouse plastics deteriorate depends on a variety of factors, including material and thickness.
Material
Polyvinyl Chloride (PVC) is a popular option for greenhouse coverings due to its durability, longevity, light transmission properties, and resilience against extreme weather conditions. However, PVC has a negative environmental impact and can react with other materials such as polyethylene, leading to deterioration. Ethylene-Vinyl Acetate (EVA) is another option that offers excellent mechanical and optical characteristics, superior flexibility, and better UV resistance than standard PE plastic. Nevertheless, EVA is more expensive and may still require repairs for punctures or tears.
Thickness
The thickness of greenhouse plastic is crucial for its durability, light transmission, and insulation properties. A thickness of 6 mil is commonly recommended as it balances strength, longevity, and light transmission. Woven plastic, available in 8 mil and 11 mil thicknesses, offers increased strength and puncture resistance, making it suitable for areas with frequent thunderstorms and hail.
When selecting greenhouse plastic, it is essential to consider factors such as climate, UV protection, durability, lifespan, light transmission, and heat retention capabilities to ensure an optimal environment for plant growth.
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Durability and longevity
The durability and longevity of greenhouse plastic sheeting depend on several factors, including weather and material. Simple 4-mil poly greenhouse plastic, for instance, typically lasts for only a year. More durable options include woven greenhouse plastic, which is stronger and more puncture-resistant, making it ideal for areas with frequent thunderstorms and hail. Woven plastic is available in 8-mil and 11-mil thicknesses, with the thicker option providing more space in the lock channel.
The lifespan of greenhouse plastic can be extended by using felt tape and repair tape, which can patch minor tears and protect against premature deterioration. Additionally, UV inhibitors can prolong the life of the plastic sheeting by preventing damage from UV radiation. However, even with UV protection, the lifespan of greenhouse plastic is limited, and signs of deterioration such as scratching, yellowing, and cracking may eventually appear.
The choice of greenhouse frame material can also impact the durability of the plastic sheeting. For example, wood frames can harbour pests, while metal and aluminium frames can absorb heat and melt the plastic at touchpoints. PVC frames are popular due to their efficiency, lightweight, flexibility, and low cost. However, PVC can chemically react with polyethylene sheeting, leading to weak spots and deterioration.
When selecting greenhouse plastic, it is crucial to consider factors such as climate, UV protection, durability, lifespan, light transmission, heat retention, material, thickness, size, transparency, and additional features. Ethylene-Vinyl Acetate (EVA) is a material used in greenhouse plastics that offers higher light transmission, better UV resistance, and superior flexibility, although it is more expensive than standard PE plastic. Ultimately, the selection of greenhouse plastic should be based on the specific needs of the plants and the desired outcomes.
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Maintenance and repair
The lifespan of greenhouse plastic sheeting depends on various factors, including weather, material, and maintenance. Here are some detailed instructions for maintaining and repairing your greenhouse plastic sheeting:
- Climate and Weather Conditions: Understand the local climate and weather conditions your greenhouse plastic will be exposed to. Heavy precipitation can weigh down the plastic, causing it to stretch. Extreme temperature changes can cause the plastic to shrink and grow, leading to cracks or tears. High winds and blowing debris can cause scratches, so ensure the plastic is securely fastened.
- UV Protection: Prolonged exposure to sunlight can cause deterioration, so choose a plastic sheeting with adequate UV protection and inhibitors. Regularly check for signs of UV damage, such as yellowing or discolouration, and repair or replace the sheeting if necessary.
- Frame Interaction: The type of frame used in your greenhouse can impact the plastic sheeting. Wood frames can harbour pests, while metal and aluminium frames can absorb heat and melt the plastic at touchpoints. Ensure your frame is in good condition and consider using a protective layer, such as felt tape, between the frame and the plastic to prevent premature deterioration.
- Thickness and Durability: Thicker plastic sheeting, such as woven greenhouse plastic, is generally more durable and puncture-resistant. Consider the thickness that best suits your local climate and the level of protection your plants require.
- Pesticides and Chemical Sprays: Avoid using pesticides or chemical sprays on your greenhouse plastic, as these can break down the material and void the warranty. If you need to use crop treatments, be cautious to avoid overspray, and wash any affected areas immediately with mild soap and water.
- Regular Inspections: Regularly inspect your greenhouse plastic for any signs of wear and tear. Minor holes, tears, or scratches can often be repaired with reinforced greenhouse repair tape, which is a UV-resistant, polyethylene-backed tape. However, if the damage is severe and affects light transmission, you may need to replace the sheeting to maintain optimal conditions for plant growth.
- Replacement: Depending on the type of plastic and your local climate, you may need to replace your greenhouse plastic periodically. Simple poly greenhouse plastic may only last a year, while more durable options can extend the lifespan.
By following these maintenance and repair instructions, you can extend the lifespan of your greenhouse plastic sheeting and provide an optimal environment for your plants.
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Frequently asked questions
The lifespan of greenhouse plastic sheeting depends on the weather and material. Simple 4-mil poly greenhouse plastic will only last a year, while thicker plastics can last longer. Polyvinyl Chloride (PVC) is a popular option for its durability and longevity, but it can degrade other types of plastic.
Extreme weather conditions such as heavy precipitation, extreme temperature changes, high winds, and heavy dirt and dust can cause premature deterioration. Additionally, the type of greenhouse frame can also affect the lifespan of the plastic sheeting. For example, metal and aluminium frames can melt plastic sheeting, and PVC can react with polyethylene sheeting, causing deterioration.
Using UV inhibitors and repair tape can help extend the lifespan of greenhouse plastic. Additionally, choosing the right type of plastic for your specific climate and understanding the interaction between the greenhouse frame and plastic can help prevent premature deterioration.
