The connectors are metal reinforced and you glue the pieces together like plastic drain pipe. If you choose aluminum, steel or wood frames, they are predrilled at the factory. The primary glazing options are glass, rigid plastic and 6-mil plastic film. Rigid flat fiberglass is somewhat more expensive, but it is very strong. Although it looks cloudy, it lets all the necessary light through.
Clear film is very inexpensive and simple to install.
The PVC frame design uses clear film. The film is tough and filters out harsh UV rays. Update Bulletin No. First, it is easier to determine if you have too much humidity. The primary sign of this in cold climates is sweating windows.