When choosing replacement greenhouse glass, it’s important to choose either a tempered glass or laminated glass. Tempered glass is safe as it is fabricated to break into small square piece instead of sharp, jagged edges. Laminated glass is even a better choice. This glass features two pieces of glass with a polyvinyl butryal interlayer. Upon impact, this glass will only incur a spider web break and does not fall out of the frame. Because of its high safety value, many building codes throughout the world require laminated glass in greenhouses. Laminated glass also removes 99 percent of harmful UV rays.
The best replacement greenhouse glass is either double or triple paned. Both types are insulated and better regulate interior temperatures compared to single pane glass. The extra layers of glass create more air space for cold and hot air to travel through, which creates the improved insulation.
In addition to its aesthetic appeal, glass is one of the most popular choices for greenhouses since it transmits 94 percent of sunlight. The downside is that glass can also transmit too much heat and kill the botanicals it’s meant to grow. Replacement greenhouse glass can also be expensive, especially large panels due to weight and shipping costs. There are many alternatives for replacement greenhouse glass available today that are less expensive and serve the same purpose as glass.
Polythene is an excellent transmitter of light because it diffuses light and spreads light evenly throughout the greenhouse. Even though polythene has become popular for greenhouses, it does have some disadvantages. The main problem with polythene is that the material is not sun resistant. Its material ages quickly and slowly its light transmission is reduced. Another key disadvantage to polythene is condensation, which eventually causes plant disease. Although many polythene greenhouses are treated with condensation-resistant products, the problem from condensation is not always reduced.
When installing greenhouse glass, care should be taken to ensure the job is properly completed. The most common glazing method used today is to hold the glass in place on a plastic strip while securing the glass with metal clips along the frame. This is a pretty simple process and usually long-lasting. However, in areas that have high winds, the clips may not be strong enough to safely secure the glass. In these circumstances, a continuous strip of metal is used that is commonly referred to as edge ridging or bar-capping. High winds can destroy a replacement greenhouse glass in mere seconds.