A sloped roof relies on gravity to move water off quickly. A flat or low-slope roof doesn't have that advantage, so it depends entirely on a sealed, watertight surface and properly placed drains to keep water from sitting and finding its way in.
That makes the details the whole job: flashing where the roof meets a wall or parapet, seals around every vent and drain, and a membrane with no weak seams. In Florida's heavy rain season, a flat roof with a poor detail at any one of those points will leak — usually right at that spot.
Ponding water — rain that sits instead of draining — is the other thing to watch. A little settling over time is normal on a flat roof, but water that stands for more than a day or two after rain is worth having looked at before it becomes a leak.
Have a flat section, porch roof or addition that keeps giving you trouble? Call C&C Master Roofing at (321) 557-5861 and we'll take a look.