Just finished our greenhouse and we have lots of left over Greenhouse polycarbonate panels.
These are the super thick insulated polycarbonate panels. They are 4 layers multiple layers equals better insulation for your winter months. These are 5/8-7/8 inch thick poly carbonate panels for extreme weather conditions they are very strong and durable. I had to drive over 6 hours to get them. Come see our green house so you can see how to use them. We have enough to build a decent sized greenhouse. Won't yellow, uv coated, ready to put up.