0096 Ponding on Flat Roofs - Flat Roofing - Built up Roofing -

Image Text: Any roof that still has water on it after 48 hours is defined as a ponding roof > a dry roof may show signs of ponding - dirty circles on the roof or algae/vegetation growth > ponding water > scupper drain > sagging roof joists can render perimeter drains ineffective by allowing water to pond in the middle of the roof