![]() ![]() The forces of gravity make significant water buildup on flat roofs a problem because the only place water can eventually go is down. Standing water on a flat roof for 12-36 hours after a rain storm can be normal, but according to the National Roofing Contractors Association, any water found ponding on flat roofs for longer than 2 full days should be examined by a professional commercial roofing contractor. Because there is a high volume of liquid, it cannot evaporate off the roof and the stagnant water has nowhere to drain. ![]() Large puddles can form on the roof surface because the drainage system is not adequate for the structure, or due to a variety of other issues with the roof design or the building infrastructure. Water ponding is when water builds up and stagnates on the surface of a roof for longer than 48 hours. ![]() START MY ESTIMATE What Is Water Ponding? Ponding water on a flat roof as seen above can cause major damage to your home or commercial property. ![]()
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