Max size is 4'x8' but can be sized smaller to any size you require. And yes, the does very well in cold weather.

What a neat idea to build and install a deck with those privacy panels. Oh, I'm sure my wife would enjoy having this. She in fact, talked to me about building a deck for the backyard this summer, so maybe I can add this feature. http://www.kinseldocks.com/docks.html 

If you do decide to go that route, please give us a call! Our office number is 1(706)678-2387.

what is the price for a 4 x 8?

the 1/4" X 4 ×8 IS $89