Keeping Water from Pooling on Commercial Roofs

Since most commercial buildings have flat roofs, it’s challenging for owners of such structures to prevent rainwater pooling on their roofs. For steep-slope roofs, you can quickly drain rainwater by installing gutters. So, what happens when you have a flat commercial roof in a heavy rain environment? Continue reading to find out how you can keep water from pooling on your commercial roof.

Drainage Solutions for Flat Commercial Roofs

While a flat commercial roof helps to improve the overall appearance of a building, it becomes a challenge when dealing with heavy rains because it is more likely to have pools of water. If these pools are not dealt with immediately, they can lead to moisture buildup, resulting in leaks and the development of mold and mildew. But you can use these drainage solutions to prevent pooling on your commercial roof.

Interior Roof Drains

These drains are similar to the drains you find in your bathroom and kitchen sinks. They are strategically placed on a commercial roof to help trap and drain water before it forms a pool. Once the interior drains collect water, they feed it through pipes that carry it away from the roof into the gutters. The water is then drained away by the channels into a water reservoir or the streets.

One of the benefits of installing interior roof drains is that they help to protect the foundation of your building against damages caused by water. Also, these drains are installed inside the roof to protect them from injuries caused by extreme weather conditions and other external elements. You can also customize your interior roof drains to suit your preference. However, these drains are a bit costly to install, especially since they have to be installed by a professional.


Scuppers are protruding openings along the edges of the roof designed to drain rainwater away from the roof. These openings can be square or round, depending on your preference. These openings can also come in the form of downspouts installed directly beneath the roof to manage water disposal.

The good thing about scuppers is that they are quite affordable and easy to maintain. They also help to add aesthetic value to a commercial building. However, you have to make sure that your scuppers are big enough not to hold debris.


Gutters are effective in both residential and commercial buildings. They’ve also proved to be a cost-effective way to drain water from a flat roof. The only problem with gutters is that they have to be cleaned regularly.