4 Ways To Combat Ponding Water On Flat Roofs

23 October 2018
 Categories: , Blog


Stormy weather can leave behind unsightly pools of water on your flat roof. Not only can it create a potential breeding ground for mosquitos during the summer, but it can also seep deeper into the roof structure through cracks and crevices. During the winter months, rooftop ponds can freeze over, and the constant freeze/thaw cycle can further degrade your roof.

The key to preserving your flat roof involves getting rid of ponding water as soon as possible. Here are a few tips that can help you remove these rooftop ponds and keep them from forming in the future.

1. Prevent Clogs at Existing Drains

Prevention is always the best policy when dealing with ponding water. That means preventing problems that keep water from draining away from the roof. Leaves, branches, and other rooftop debris can get stuck inside of rain gutters, drains, and downspouts and hold back water that would otherwise drain off the roof normally.

Preventive roof maintenance can help keep debris from clogging up your roof's drainage system. During a scheduled visit, your roofing contractor will check your drains for clogs, remove any existing clogs with specialized tools, and implement measures to keep clogs from forming. These preventive measures include the installation of gutter guards and drain covers.

2. Install Additional Drains

Ponding water can also be caused by unintentional design flaws. For instance, your flat roof may be designed without enough drains to effectively channel and remove water from the structure. A lack of adequate drainage can be a problem in areas with higher-than-average rainfall. If you're dealing with severe cases of ponding water, you may need to install additional drains to solve the problem.

3. Repair Low Spots

Deck sagging caused by old age and previous instances of ponding water can create low spots, making it harder to remove accumulated water. Roof insulation can also settle with age, adding to the problem. Your roofing contractor may attempt to raise these spots with roof plaster or other material to level the surface and encourage proper water flow towards drainage areas.

4. Redo the Roof Pitching

In some cases, the original pitch of your flat roof may not be enough to properly direct water off the roof. This problem can pop up if the flat roof wasn't installed properly. If the cures discussed in the previous sections don't work for your flat roof, you may need a qualified and licensed roofing contractor to completely redo the pitching. Repitching can be a complicated and expensive task, so it should only be done as a last resort.  

For more information, contact commercial roof services near you.


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