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Standing or ponding water on concrete balconies, plaza decks, and parking garages can lead to waterproofing or structural damage. Here's how to fix it.
In civil engineering, ponding is the (typically) unwanted pooling of water, typically on a flat roof or roadway. Ponding water accelerates the deterioration of many materials, including seam adhesives in single-ply roof systems, steel equipment supports, and particularly roofing asphalt.
What Is Water Ponding? Ponding water on a flat roof as seen above can cause major damage to your home or commercial property. Water ponding is when water builds up and stagnates on the surface of a roof for longer than 48 hours.
Ponding Water on TPO and PVC Membranes RI 01252021 What Is Ponding Water? GAF deļ¬nes “ponding” water as water that does not drain or dissipate from the roof surface within 48 hours after precipitation ends. How Does Ponding Water Occur? Ponding can occur from various water sources, such as :
Ponding refers to the accumulation of water on the surface of a flat roof. This phenomenon occurs when water remains on the roof for an extended period after rain or snowmelt due to inadequate drainage.
Ponding water is defined as the water which remains on a roof 48 hours or longer. Water may accumulate on a low slope roof due to rain, snow or runoff from rooftop equipment. Ponding water can have major negative consequences, regardless of the type of roofing system.
Water ponding is the accumulation of water on flat surfaces such as slab-on-grade, flat decks, driveways or balconies. This can occur due to water seeping upward from inside (or below) the surface, or its source can be external, such as rainwater.
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. There are several measures you can take to stop water pooling on a flat roof, including flushing the drains, adding more drain lines, installing roof crickets, and more.
Residential flat roofs can develop ponding, or leftover puddles of water that can degrade the roof overtime. Learn what causes ponding and how to fix it.
If you realize you have ponding on your flat roof, it's important to have it assessed as soon as possible. Any water that stagnates on your roof for longer than 48 hours is cause for concern, and there are a variety of problems associated with ponding.