Ponding on a roof is the collection of water due to improper roof slope or improper drainage. The added weight causes stress over seams and membranes that can lead to splits and allow water to enter the roof system. Over time, ponding water can accelerate the deterioration of roofing membranes and have many adverse effects include:
- Deformation of the deck structure
- Damage to the roof surface
- Growth of algae and vegetation
- Accumulation of dirt and debris in the ponding area
These conditions can lead to leaks, damage to roofing components and ultimately premature failure of the roof system. Multiple freeze-thaw cycles will cause damage at an even quicker rate, so it is essential to prevent water from ponding on roof surfaces.