How Do You Drain Water From A Flat Roof?

Flat roofs generally are susceptible to clogs which can eventually result in leakage. If you decide to install a flat roof on your property, you should get to know the different methods you could use to drain it. With a flat roof, you may have enough space to own a rooftop garden, but without a proper drainage system, it could cause severe damage and ultimately give way. Here are some ways to effectively drain your flat roof.

Inner Drains

Most commercial properties have internal drainage and are also used for residential homes. This type of drainage system uses a system of pipes commonly located below the roof to transport water away from the home’s foundation. The standard placement of the drains is in the center of the roof.


  • The pipe system is protected by the roof and walls, reducing the risk of any damage to the pipes.
  • The walls and the building’s foundation are well protected from water damage.
  • The drainage system can be customized to suit your taste.


  • Interior drains are more expensive than all the other roof flats.
  • They easily get clogged, so you have to be more mindful.


Regarding flat roofs, gutters are the most used drainage system. They work similarly to the gutters fixed on sloped roofs; they collect rainwater, divert it into a downspout, and

carry it away from the building. Choose a very durable material to ensure that your gutters last for a long time. The most popular are vinyl, galvanized steel, and aluminum.


  • They are cost-effective and easy to install.
  • The system is effective in preventing water from pouring off the roof.
  • Gutters are excellent for keeping water away from the building, preventing water damage inside your home.


  • Gutters can get detached from fascia boards in the long run.
  • Gutters are prone to damage from ice, severe weather, and debris buildup.


These are large square openings on the side of a building’s roofline that catches water and diverts it away from the building.


  • Scuppers are considered the best choice for draining water from flat roofs efficiently.
  • They are a cost-effective system that doesn’t require rigorous maintenance.
  • They rarely get clogged if they are wide and large enough.
  • They can improve the architectural appeal of the building.


  • If you have a downspout installed beneath the scuppers, they will require regular inspection because they are prone to clogging.
  • Scuppers do not perform well in heavy downpours and snowmelt.

Any above drainage systems will properly divert water from your flat roof if installed well and maintained regularly. Before you make your choice, do well to consider the pros and cons of each drainage system as well as their cost, durability, and maintenance requirements. Also, seek the advice of a professional roofer.

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