Apparently you installed the smooth-side out, Ric, which is what you should have done. The plastic being smooth and "slippery" allows the snow to slide off the roof. I still have to use shade cloth, either 60% or 70% and install it in the spring. Though the solar blanket material does indeed diffuse light (and is supposed to block UV), I can't take the chance with all my orchids and other tropical plants. Though sunburn doesn't kill plants, it sure does make those sunburned leaves ugly. I remove the solar blanket material from two side plus the roof on my free-standing GH and the roof/side on the lean-to in the spring, when the night/morning temperatures stay above 50 F.
