There are two main materials when it comes to translucent sheeting: polycarbonate and fiberglass. ... The most obvious difference is that polycarbonate roofing panels are made from a translucent polymer plastic, whereas fiberglass roof panels are resin coated, fiber reinforced polyester.
Because fiberglass is made up of interwoven fibers, the material is also more likely to splinter while modifying. Polycarbonate enclosures can be easily modified in the field using standard tools without being damaged or causing health concerns.
They allow light into the building.