I have a flat carport roof circa 1965 that is not part of the (shingled) house roof. Originally it was a rubber roof, but a couple of years ago I covered it in a white EPDM roofing membrane in an effort to stop some leaks. That helped for a short time but now the leaks are back and worse than before. I've looked online and have seen a Dow RoofMate product that allows you to angle the roof by stacking styrofoam squares then covering it. Anybody have experience/thoughts about this? Anybody have suggestions/opinions about how I should attack this? Of course I prefer to do it myself and at a reasonable price.