^This is correct. I average over an inch of rainfall a week. Also, I'm in "sunny" Florida.
Took a thermometer to test radiant heat. 6" away from the roof, with proper ventilation, there is less than two degrees of difference between ambiant air temp and measured air temp in my builds. At 1'...
It will be easier to match up profiles if you stick with all one material. That said, pricing is similar, but metal lasts much longer. For that reason, most of us go with metal.
the darker your PVC, the longer it will last (has to do with UV light), but of course the hotter it will get. Not...