Navigating the Pros and Cons of Plastic vs. Glass in Greenhouse Glazing

When it comes to greenhouse glazing, there are two primary materials to consider: plastic and glass. Each option offers its own set of advantages and disadvantages, making the decision a crucial one for greenhouse owners and operators.

Simply Plastics, one of the leading suppliers of greenhouse glazing materials, understands the importance of this choice. In this article, they will explore the pros and cons of plastic and glass as greenhouse glazing materials to help you make an informed decision for your specific needs.

Plastic Glazing: Versatility and Affordability


Plastic, particularly polycarbonate and polyethene, is a popular choice for greenhouse glazing due to its versatility and affordability. One significant advantage of plastic is its lightweight nature, making it easy to handle and install. Additionally, plastic provides excellent insulation properties, helping to maintain a stable and controlled environment for plant growth. This insulation capability also helps reduce heating costs, making it an attractive option for greenhouse owners.

Furthermore, plastic glazing materials are highly durable and resistant to impact, which is particularly advantageous in areas prone to extreme weather conditions. They also offer good UV protection, shielding plants from harmful rays. Plastic is available in various thicknesses and can be treated with special coatings to enhance its durability, UV resistance, and light transmission.

However, plastic glazing materials are not without their drawbacks. Over time, plastic may yellow or become brittle due to prolonged exposure to sunlight. This can reduce light transmission and the aesthetic appeal of the greenhouse. Additionally, some types of plastic may be prone to scratching, which can affect light transmission and create a breeding ground for bacteria and fungi if not properly cleaned and maintained.

Glass Glazing: Optimal Transparency and Longevity


Glass has long been the traditional choice for greenhouse glazing and continues to be favoured by many greenhouse enthusiasts. Its main advantage lies in its superior transparency, allowing for maximum sunlight penetration and optimal plant growth. Glass also maintains its clarity over time, providing a visually appealing and professional-looking greenhouse.

Furthermore, glass is highly resistant to scratching and does not deteriorate with prolonged exposure to sunlight. Its durability ensures a long lifespan, making it a cost-effective choice in the long run. Additionally, glass is less prone to expanding and contracting due to temperature fluctuations, providing stability to the greenhouse structure.

However, the use of glass for greenhouse glazing also presents some challenges. Its heavyweight requires sturdy framing systems and professional installation, adding to the overall cost. Glass has poor insulation properties compared to plastic, necessitating additional heating during colder seasons. Moreover, glass can break under high impact or hail, which may result in higher maintenance and replacement costs.


In the debate between plastic and glass for greenhouse glazing, there is no definitive winner. Both materials offer unique advantages and disadvantages, and the decision ultimately depends on the specific needs and preferences of greenhouse owners. Plastic glazing provides versatility, affordability, and excellent insulation, albeit with potential durability concerns. On the other hand, glass glazing offers superior transparency, longevity, and an appealing aesthetic, but at a higher cost and with reduced insulation properties.