Ponding Water On Roof

Determining the root cause of ponding water regardless of the formula roof coatings should never be an excuse to ignore ponding water issues.

Ponding water on roof.

Flat roofs by their very nature will collect some water when it rains. 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. 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. Roofs should be constructed in such a way that all water drains within 48 hours of the rain stopping.

It may also void your warranty. Proper design installation and maintenance of roofing structures can prevent this condition and its associated problems. So if your flat roof is collecting water that doesn t drain or evaporate within 48 hours you will need to fix it. The water may seep into the roofing material and cause damage inside cause.

Ponding water is defined as the water which remains on a roof 48 hours or longer. Ponding water might not be an immediate threat but if it is allowed to persist over time that water can begin to wear on the roofing membrane. Ponding occurs when after a storm or heavy rain water collects in pools on the roof. 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. How to fix ponding on a flat roof depends on the cause of the ponding. Ponding water can have major negative consequences regardless of the type of roofing system.

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. When water pools for longer periods of time it can indicate a serious problem. 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. Water may accumulate on a low slope roof due to rain snow or runoff from rooftop equipment.

On a performing flat roof ponding water is not a problem as it will drain or even evaporate away. 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. 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. Ponding is the phenomenon of water pooling on flat roofs after storms snow melts or heavy rains.

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. Every roof needs positive drainage which means water should flow off the roof within 48 hours.