Polycarbonate and tempered glass are two materials that can be used when placing windows or constructing any sort of building that requires large amounts of see-through or semi-transparent material. They have similar properties, as well as different advantages and disadvantages.
Disadvantages of Tempered Glass
Tempered glass has a number of disadvantages as well. It can be very expensive. Due to its weight, it requires a significantly stronger frame to support it. In roofing applications, if a crack appears, the entire pane cracks, which is generally not desirable. It also doesn't diffuse sunlight, which can lead to hot spots when used in an overhead position.
Advantages of Polycarbonate
There has been an increased use of polycarbonate in recent years because it is less expensive, light and nearly indestructible. When installed, it easily makes a watertight seal. It also diffuses sunlight and keeps 100% of UV rays out.