Tips to Drain Water from a Flat Roof

If you have a flat roof on your home or business, then it is important to know how to drain water from it. A flat roof can easily become damaged if water accumulates on it for an extended period. While flat roofs should be designed for draining, this doesn’t stop issues from occurring from time to time.


These days, scuppers are one of the most common ways to drain water from flat roofs. Scuppers are essentially drains that allow rainwater to flow off the roof and away from the building. These scuppers should be placed at the low points of the roof where they can receive water and direct it away.

Inner Drains

Next, you can use inner drains to drain water from flat roofs. Inner drains are installed along the sides of the roof and collect rainwater that flows off the edges of your flat roof. This is an effective way to direct water away from your building as it also helps you ensure that no water collects in any pockets or low spots on your roof.

Siphonic Roof Drainage

Another option for draining water from a flat roof is to install siphonic drainage. This type of drain is connected to a pipe that directs the water away from your building and into a gutter system or stormwater management area. It works by using gravity to draw the water down through the pipe, making it an efficient way to keep water off your roof.


As another roofing system, you may want to consider installing gutters on your flat roof. Gutters are effective at collecting rainwater and directing it away from the building, preventing water from pooling on the roof.

In addition, you can use a combination of these strategies to ensure that your flat roof is draining properly. By using a combination of drainage methods from Glendale roofing companies, you shouldn’t encounter pooling. If you do, here are some more tips to explore for your home.

Fix Any Low Spots

Low spots are an issue on flat roofs because they can interfere with proper drainage. If you find any low spots on your roof, consult a professional roofer to assess and correct the problem. The roofer may suggest installing shingles or tiles over the affected area to raise it and ensure that water will flow off as intended. Alternatively, they may recommend adding a new drainage system to ensure that water flows away from these areas.

Add Drain Lines or Downspouts

If your flat roof lacks a drainage system, you can install one. Adding downspouts or drain lines will help ensure that water is properly directed away from the home and into an area that allows it to flow freely. Make sure to install these in areas where they won’t be interrupted by other components of your roof.

Replace the Membrane

If the roof has a membrane, it may be time to replace it; this can help ensure that water can flow away from the home as intended. There are different types of membranes available, so make sure to choose one that is compatible with the surface of your flat roof. For example, you may want to choose a rubber membrane if your roof is made of asphalt shingles.

Check the Insulation and Ventilation

Lastly, make sure to check the insulation and ventilation of your flat roof. Poor insulation can cause standing water on your roof, while inadequate ventilation can trap moisture and cause mold or mildew issues. Properly insulating and ventilating your roof can help keep water flowing away from your home.

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