How To Drain A Flat Roof

Drainage helpers are a good option if you already have a good flat roof drain system but want to provide your system with the ability to move more water if need be.

How to drain a flat roof.

The angle is not significant enough to prevent water from pooling on the surface. If a flat roof drain is too small it can easily become blocked or simply not be in the right area for accurate draining of pooling water. A flat roof drain can also fail by becoming detached from the roof. They are ideal for climates that don t experience large quantities of rain and moisture.

Flat roof drains scuppers gutters and drainage systems on flat roofs. To keep damage like leaks from occurring water should not stand on a flat roof for more than 48 hours. A rooftop garden or additional outside living space are the top reasons people choose flat roofs. There are several drainage options to repair pooling or ponding water on flat roofs including internal drains gutters and downspouts scuppers and roof leveling compounds.

More attention should be given to the location of a drainage system to avoid future problems. For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. Calculate drains needed.

Flat roofs have unique architectural characteristics that make them desirable in many situations. Ponding water on flat roofs reduces the roof s lifespan. Inner drains gutters or scuppers each have their own function and deciding which system is best depends on. Fitting the roof with one of the following systems to ensure proper drainage will help keep it protected.

Take the roof s total square footage and divide by the total square footage handled by one drain. The result is the number of drains needed. Challenges the drains must allow a large volume of water equal to the square footage of your roof times the number of inches of rain to drain quickly. The greenslope roof ponding repair kit provides a lightweight inexpensive solution to flat roof ponding.

This system works by recessing insulation in installed drains to allow for faster water drainage. Leaving your flat roof without a drainage system will greatly increase the risk of these issues. One of the most overlooked items on a flat roof is the draining system. A flat roof drain is one of the most important features of a flat roof design and they need to be taken care of.

The above sizing data is offered as a guide only.