johno1234:

 

Anyone used Crystalite or ClearVue systems? They are use a flat clear roofing sheet with an extruded aluminum glazing bar system. I am thinking of using it to put a clear roof over an existing pergola to cover a patio.

 

I've got a small pergola extending the house roof over a deck, with ClearVue on it.  5 years in i'm very happy with it. I might have to get up there with a microfibre cloth soon to give it its first clean.