what-is-the-best-polycarbonate-for-a-greenhouse| Expert Advice

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what is the best polycarbonate for a greenhouse

When it comes to constructing a greenhouse, choosing the right materials is paramount to creating an environment that fosters healthy plant growth. Polycarbonate has emerged as a favored option for greenhouse coverings due to its unique properties, including insulation, durability, and light diffusion. However, with various types and options available, selecting the best polycarbonate for your greenhouse can be a complex decision. In this exploration, we will delve into the critical factors to consider when choosing polycarbonate sheets for your greenhouse, guiding you toward the most suitable choice to ensure the success of your gardening or horticultural endeavors. From insulation capabilities to UV protection and cost-effectiveness, we will bring clarity to the essential details that will help you make an informed decision about the ideal polycarbonate for your specific greenhouse requirements.

What is Polycarbonate?

what is the best polycarbonate for a greenhouse

Polycarbonate is made from chemicals that are called resins. There are two types of polycarbonates: linear polycarbonates and cyclic polycarbonates. Linear polycarbonates have a chemical formula that is CxHxOy while the cyclic polycarbonates are called BPA-free polycarbonates. Cyclic polycarbonates are made from bisphenol A. Cyclic polycarbonates are BPA free and are preferred for greenhouse use.

Polycarbonate is a thermoplastic that has many different uses. It’s used in construction materials like windows, doors, and roofing. It’s also used in medical equipment like heart valves and catheters.

Linear polycarbonates are stronger than cyclic polycarbonates, but they are more expensive.

Polycarbonate is not easy to work with. It tends to crack, peel, and split. You can seal it with silicone or acrylic glazing compounds to make it a bit easier to work with.

If you’re planning to use a greenhouse in a colder climate, you may want to use linear polycarbonate instead of cyclic polycarbonate.

How to Choose the Best Polycarbonate for a Greenhouse

Choosing the best polycarbonate for a greenhouse is a complex process. There are many factors that need to be taken into consideration, such as cost, performance, durability, ease of installation and maintenance, and much more.

Choosing the best polycarbonate for a greenhouse is essential for ensuring optimal growth conditions for your plants. Polycarbonate sheets are a popular choice due to their durability, insulation properties, and ability to diffuse light. Here are the key details to consider when selecting the right polycarbonate for your greenhouse:

  1. Types of Polycarbonate:
    • Twin-Wall Polycarbonate: This type of polycarbonate consists of two layers with insulating air pockets between them. It provides excellent insulation and diffusion of light, making it suitable for year-round use.
    • Multi-Wall Polycarbonate: Multi-wall sheets have more layers, providing better insulation. They are ideal for extreme climates with hot summers and cold winters.
    • Single-Wall Polycarbonate: These sheets are less insulating but are still effective in providing diffused light. They are a cost-effective option for greenhouses in milder climates.
  2. UV Protection: Look for polycarbonate sheets with UV protection. UV-coated polycarbonate prevents the harmful effects of UV radiation on plants and the material itself, ensuring a longer lifespan.
  3. Light Transmission: Consider the light transmission properties of the polycarbonate. You want a material that diffuses sunlight evenly throughout the greenhouse. Optimal light transmission supports healthy plant growth.
  4. Thickness: Polycarbonate sheets come in various thicknesses, typically ranging from 4mm to 16mm. Thicker sheets provide better insulation but may be more expensive. Choose the thickness that suits your climate and budget.
  5. R-Value: The R-value measures the insulation ability of the polycarbonate. Higher R-values indicate better insulation. Select a polycarbonate with an appropriate R-value for your climate.
  6. Durability: Ensure that the polycarbonate is resistant to impacts and weathering. Some sheets come with special coatings to enhance durability and reduce scratches.
  7. Ventilation and Heat Regulation: Consider how you will regulate temperature and ventilation in your greenhouse. Some polycarbonate sheets may have features like built-in ventilation or heat-reflective coatings to help manage temperature.
  8. Installation and Compatibility: Ensure that the chosen polycarbonate is compatible with your greenhouse frame and structure. Some sheets have specific installation requirements.
  9. Warranty: Check the manufacturer’s warranty. A longer warranty period can provide peace of mind regarding the durability and performance of the polycarbonate.
  10. Cost: Compare the cost of different polycarbonate options and consider the long-term benefits of energy savings and reduced maintenance when making your decision.
  11. Local Climate: Tailor your choice to your local climate. Greenhouses in cold, snowy regions will have different requirements than those in hot, sunny areas.
  12. Supplier and Brand: Choose a reputable supplier and a well-known brand to ensure product quality and availability of support or replacements.

By considering these details and assessing your specific greenhouse needs and climate conditions, you can select the best polycarbonate material to create a thriving environment for your plants while ensuring the longevity and efficiency of your greenhouse.

Why use Polycarbonate for Greenhouses?

Polycarbonate is a popular choice for greenhouse construction due to its numerous advantages. Its unique properties make it an excellent material for creating an ideal environment for plant growth. First and foremost, polycarbonate provides exceptional insulation. Its multi-wall or twin-wall structure traps air between layers, effectively regulating temperature and maintaining a stable climate inside the greenhouse. This insulation not only protects plants from extreme weather conditions but also allows for year-round cultivation.

Furthermore, polycarbonate offers excellent light diffusion, ensuring that plants receive uniform, gentle sunlight. This diffusion minimizes the risk of sunburn or uneven growth, promoting healthier and more productive crops. Additionally, polycarbonate sheets are lightweight, durable, and impact-resistant, reducing the risk of damage and the need for frequent replacements.

UV protection is another key benefit of using polycarbonate. Many polycarbonate sheets are coated to block harmful UV radiation, safeguarding both the greenhouse structure and the plants within. This UV resistance extends the lifespan of the material and maintains a consistent growing environment.

Lastly, the versatility of polycarbonate allows for a range of greenhouse designs and configurations. Whether you’re building a small hobby greenhouse or a large commercial facility, polycarbonate can be customized to suit your needs. Its ease of installation and compatibility with various greenhouse frames make it a practical choice for growers of all scales.

In summary, the use of polycarbonate in greenhouse construction provides insulation, light diffusion, durability, UV protection, and versatility, all of which contribute to healthier plants and a more efficient growing environment. Whether for hobbyists or commercial growers, polycarbonate is a top choice for those seeking to create a productive and sustainable space for cultivating plants.

How Thick Should Greenhouse Polycarbonate be?

How thick should the polycarbonate for greenhouse glazing be? This is one of the most important questions in choosing a polycarbonate greenhouse. The thickness of the polycarbonate greenhouse glazing should be based on several factors. The first factor to consider is how much light is coming into your greenhouse from the south. If you have a lot of sunlight, you can use thinner polycarbonate to make sure that you still have enough light entering the greenhouse. You can also make thicker polycarbonate to increase the amount of light that enters your greenhouse. The amount of sunlight your greenhouse receives will determine how thick the polycarbonate greenhouse glazing should be. If you live in a cold climate, you should put the polycarbonate greenhouse glazing at least one-third of the way up on the walls of your greenhouse. This can allow you to protect the glass from frost during the winter.

The next factor to consider is how much weight the polycarbonate greenhouse glazing will have to bear. If you have heavy plants or equipment inside your greenhouse, you will need to install the polycarbonate greenhouse glazing at a higher level.

What are the Advantages of a Polycarbonate Greenhouse?

Polycarbonate greenhouses offer several advantages that make them a popular choice for gardeners and commercial growers alike. Here are the key advantages of using a polycarbonate greenhouse:

Excellent Insulation

Polycarbonate sheets, especially multi-wall or twin-wall varieties, provide superior insulation compared to traditional glass or single-wall materials. This insulation helps maintain a stable and controlled environment inside the greenhouse, which is crucial for plant growth year-round.


Polycarbonate is highly durable and impact-resistant. It can withstand hail, heavy rain, and strong winds without breaking or shattering, reducing the risk of damage to the greenhouse structure and its contents. This durability results in a longer lifespan for the greenhouse.

Light Diffusion

Polycarbonate sheets are designed to diffuse sunlight effectively. This even distribution of light reduces the risk of sunburn on plants and ensures that all plants receive adequate light, resulting in healthier and more uniform growth.

UV Protection

Many polycarbonate sheets come with UV-resistant coatings that block harmful UV radiation. This protection prevents the deterioration of the material and protects plants from excessive UV exposure, which can be damaging.

Energy Efficiency

The insulation properties of polycarbonate reduce the need for heating in cold weather and cooling in hot weather, resulting in lower energy costs for maintaining the greenhouse’s temperature. This makes polycarbonate greenhouses more energy-efficient and cost-effective in the long run.


Polycarbonate sheets are lighter than glass, making them easier to handle during installation and reducing the load on the greenhouse frame. This can simplify construction and reduce installation costs.


Polycarbonate can be customized to suit various greenhouse designs and sizes. It is available in different thicknesses and configurations, making it suitable for both small hobby greenhouses and large commercial facilities.

Condensation Control

Multi-wall or twin-wall polycarbonate sheets can help control condensation inside the greenhouse. They have chambers that capture and drain condensation, preventing it from dripping onto plants and potentially causing fungal or bacterial issues.

Low Maintenance

Polycarbonate is low-maintenance compared to some other materials. It doesn’t require frequent cleaning or replacement due to breakage, and its resistance to discoloration means it remains aesthetically pleasing over time.


While the initial cost of polycarbonate may be higher than some alternatives, its long-term benefits, such as energy savings, reduced maintenance, and extended lifespan, often make it a cost-effective choice for greenhouse construction.

Environmental Benefits

Polycarbonate is a recyclable material, which aligns with sustainable practices. Additionally, its insulation properties contribute to reduced energy consumption, promoting eco-friendly greenhouse operations.

In conclusion, polycarbonate greenhouses offer numerous advantages, including superior insulation, durability, light diffusion, UV protection, and energy efficiency. These benefits make them an excellent choice for growers looking to create a productive and sustainable environment for their plants while minimizing maintenance and operating costs.

What is the Difference Between Polycarbonate and Glass?

The choice between polycarbonate and glass for various applications, including greenhouses, windows, and construction, often depends on specific requirements and considerations. Here, we’ll highlight the key differences between polycarbonate and glass:

Material Composition
  • Polycarbonate: Polycarbonate is a synthetic thermoplastic polymer known for its durability and impact resistance. It’s typically produced in multi-wall or twin-wall sheets for applications requiring insulation.
  • Glass: Glass is a traditional material made from silica, soda ash, and lime. It is solid and transparent and comes in various thicknesses and types.
Strength and Durability
  • Polycarbonate: Polycarbonate is significantly more impact-resistant than glass. It can withstand hail, heavy winds, and accidental impacts without shattering, making it a safer choice, especially in areas prone to extreme weather.
  • Glass: Glass is more brittle and prone to breaking upon impact. It may require safety measures like tempered or laminated glass to reduce the risk of injury in case of breakage.
Insulation and Thermal Properties
  • Polycarbonate: Polycarbonate offers superior insulation properties, particularly when using multi-wall or twin-wall sheets. It helps maintain stable temperatures in greenhouses and conserves energy, making it a cost-effective choice.
  • Glass: Glass is a poor insulator and can lead to temperature fluctuations in enclosed spaces. Additional insulation is often required when using glass for thermal control.
Light Transmission and Diffusion
  • Polycarbonate: Polycarbonate sheets can be engineered to provide excellent light diffusion, ensuring that light is evenly distributed inside a greenhouse or building. This promotes healthier plant growth.
  • Glass: Glass offers clear and undistorted transparency. While this is ideal for certain applications, it may require shading to prevent excessive sunlight exposure in greenhouses.
  • Polycarbonate: Polycarbonate is lightweight compared to glass, which makes it easier to handle and install. This can be an advantage, especially for large-scale projects.
  • Glass: Glass is heavier, which may require stronger support structures and more labor-intensive installation.
UV Resistance
  • Polycarbonate: Polycarbonate sheets often come with UV-resistant coatings that protect both the material itself and the contents of a structure from harmful UV radiation.
  • Glass: Glass naturally filters UVB rays but may allow UVA rays to pass through. Special coatings or films can be applied to enhance UV protection.
  • Polycarbonate: Polycarbonate sheets are generally more affordable than high-quality glass, making them an economical choice for many applications.
  • Glass: High-quality glass can be expensive, especially for larger projects or specialty glass types.

In summary, the choice between polycarbonate and glass depends on factors such as strength, insulation, light diffusion, UV protection, and cost. Polycarbonate is often favored for its durability, insulation properties, and impact resistance, making it a suitable choice for greenhouses, while glass may be preferred for applications requiring maximum clarity and aesthetics but at a potentially higher cost and with additional considerations for safety and insulation.

What Color Should my Polycarbonate be?

The choice of color for your polycarbonate sheets depends on the specific needs and goals of your project. Polycarbonate sheets are available in a variety of colors, each offering distinct advantages:


Clear polycarbonate sheets allow the maximum amount of natural light to enter your space. This is ideal for applications where high light transmission and visibility are essential, such as greenhouses or skylights. Clear polycarbonate is also popular in residential and commercial construction to provide natural lighting.

Opal or White

Opal or white polycarbonate sheets are designed to diffuse light effectively while reducing glare and direct sunlight. They are often used in greenhouses to provide uniform and gentle lighting, preventing sunburn and promoting even plant growth. These sheets are also suitable for privacy screens, awnings, and carports.

Tinted or Colored

Tinted or colored polycarbonate sheets come in various shades, such as bronze, gray, or blue. These sheets provide some level of shading and can reduce solar heat gain. They are commonly used in applications where heat and UV protection are important, such as in sunrooms, skylights, or outdoor roofing.

IR-Reflective or Heat-Reflective

These polycarbonate sheets are specially designed to reflect infrared (IR) radiation while allowing visible light to pass through. They are ideal for controlling heat buildup in spaces like conservatories or rooms with large windows, helping to keep interiors cooler.

Custom Colors

Some manufacturers offer custom color options, allowing you to choose a color that matches your aesthetic preferences or branding. Custom colors can be particularly appealing in commercial or architectural applications.

When selecting the color of your polycarbonate sheets, consider factors such as the desired level of light transmission, heat control, privacy, and aesthetic appeal. Additionally, take into account the specific requirements of your project and the environmental conditions in your location. For example, in hot and sunny climates, heat-reflective or tinted polycarbonate can help reduce cooling costs, while in cooler regions, clear or opal sheets may be preferred to maximize natural light and warmth. Ultimately, the choice of color should align with your project’s goals and functional needs.


selecting the best polycarbonate for a greenhouse is a decision that should be based on a careful assessment of your specific needs and environmental conditions. The choice typically revolves around factors such as insulation, light diffusion, UV protection, cost, and durability. Twin-wall or multi-wall polycarbonate sheets are excellent choices for their superior insulation properties and light diffusion, making them suitable for year-round use and healthy plant growth. UV-resistant coatings and proper thickness ensure the longevity of the material and the well-being of your plants. Ultimately, the best polycarbonate for your greenhouse will be one that aligns with your climate, budget, and long-term objectives, creating an optimal environment for successful plant cultivation.

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