twin-wall polycarbonate greenhouse panels
I'm building a 11'x 24' lean-to greenhouse onto the back of my house. It'll be a wood frame structure with twin-wall polycarbonate panels on top. Two questions . . .
1. What is the best twin-wall polycarbonate panel to use? Clear? Opaque? Lexan? Lexan Plus? Polygal? 6mm? 8mm? Etc?
2. Does anyone know where I can find any of these polycarbonate panels in the upstate? I'm in Walhalla, SC and so I can also easily make it to western NC or northeastern GA for pick-up. I only need 6 4'x 12' panels and having them shipped isn't cost effective.