Greenhouses can be covered in one of three materials. This includes glass, polycarbonate, and plastic film. Each one of these materials has pros and cons associated with it. So before you decide on a certain greenhouse structure or shape, consider the covering.
All coverings should go through a checklist that includes cost, ease of repair, durability, weight, how much light goes through the material and how much heat is released through the material.
Glass Paned Greenhouse
The Large Royal Victorian Greenhouse sold by Outdora is an excellent example of a glass paned greenhouse. This type of greenhouse covering is durable, has low maintenance cost, absorbs photosynthetically active radiation (PAR) easily, releases excess heat during the night and has a low transmission rate of UV light.