This is my beautiful American Harvest Greenhouse (from Gardener's supply) after my neighbor hit a softball which struck the roof. The panels are double glazed with Tedlar on the outside - (treated to resist the UV from the sun) and Courtgard on the inside of the panel. The green house is guaranteed for 10 years and its is now 12 years old. I've really gotten my money's worth out of it and and totally happy with it. I can't say as much for my neighbor!
Yvonne
Yvonne