I haven't tried polycarbonate yet. I used the old translucent fibreglass panels to build vent windows in the greenhouse, and they are affected by the sunlight. They turn real cloudy. I've been thinking about 24mil polyvinyl curtains (the same type that are used for vehicle access into climate controlled areas) but then weight comes into the picture.
I often tell the Mrs that we should have built a greenhouse and moved in there instead of a house. Sometimes, I think she takes me seriously. ;)
Brier Bender's solution to hail destroying the 6 mil greenhouse covering was to use a router on all the spars and then invite a FRiend from the glass company out to share 2 cases of beer while he cut the double strength glass to fit. Every opening was DIFFERENT so I made 2 adjustable jigs to aide the glass cutter. Sealing the hubs was not easy and wood rot finally took its toll but it lasted almost 30 years…
