Ponding Water On Roof

Ponding occurs when after a storm or heavy rain water collects in pools on the roof.

Ponding water on roof.

Ponding water is defined as the water which remains on a roof 48 hours or longer. On a performing flat roof ponding water is not a problem as it will drain or even evaporate away. Water may accumulate on a low slope roof due to rain snow or runoff from rooftop equipment. Ponding is the phenomenon of water pooling on flat roofs after storms snow melts or heavy rains.

The adverse effects of ponding water on roofs can include. Ponding water can have major negative consequences regardless of the type of roofing system. Roofs should be constructed in such a way that all water drains within 48 hours of the rain stopping. If only certain areas are ponding we recommend that you apply two coats of our standard roof coating up to 12 inside the ponding water area.

If a large portion of the roof is ponding you can coat the entire roof with this product. Ponding water is known in the roofing community as water that stands in a puddle on the roof for more than 48 hours at a time. The water pools after days or hours of steady precipitation due to a variety of causes such as a clogged drain or structural issues that inhibit drainage. The water may seep into the roofing material and cause damage inside cause.

Puddles or ponding water is water from rainstorms and snow melts that collects on a flat roof and doesn t drain or evaporate after 48 hours. Ponding on a flat roof refers to when water collects and creates small pools or ponds while most of these small pools eventually drain off or even evaporate over a few hours it can become problematic when pooling water stands on top of a roof for 2 days or more. Pools should drain away without causing any damage to the structure but owners and managers should know when to take action how to identify the cause of the ponding and how to resolve it. Most pools of water will quickly drain off or even evaporate but owners should be aware of the signs that ponding has become an issue.

How to fix ponding on a flat roof depends on the cause of the ponding. When water pools for longer periods of time it can indicate a serious problem. Flat roofs by their very nature will collect some water when it rains. After any rainfall lands on a flat roof water will begin to pool.

However when your flat roof has uneven areas due to sagging an insufficient slope or drainage issues the ponding water doesn t dissipate. However excessive ponding threatens your roof. Then apply a coat of the pond coat 24 larger than the perimeter of the ponding area so in essence you will be overlapping the standard coating with pond coat and the pond coat will extend 24 beyond the furthest point of ponding water. Every roof needs positive drainage which means water should flow off the roof within 48 hours.

It may also void your warranty. So if your flat roof is collecting water that doesn t drain or evaporate within 48 hours you will need to fix it.