Isaac, Thanks for the reply regarding heat. I am stubbing for both options, because I am not sure yet and wanted to get the pool going. We do have a flat roof (see scupper issue for drainage), so I don't think surface area is a problem being that we are one story, but I haven't seen panels rolled out on a flat roof and will the water affect it since drainage is a bit slower than a pitched roof? and what about moisture condensation between the material and when I have to re seal the roof which is recommended every 5 years or so and what about the radiant heat cracking the roof foam? Oh, No. So much easier on tile. ugh... This is something I just though of. My husband says I am pool obsessed, but really the more I find out the more complicated it is! Kudos to those who start on this forum way before their pool build. wendy p What is the best way to find the folks with flat roofs and solar panels on here to ask?