How To Drain A Flat Roof

A rooftop garden or additional outside living space are the top reasons people choose flat roofs.

How to drain a flat roof.

Calculate drains needed. Flat roof drains scuppers gutters and drainage systems on flat roofs. Flat roofs have unique architectural characteristics that make them desirable in many situations. 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.

For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important. The angle is not significant enough to prevent water from pooling on the surface. The above sizing data is offered as a guide only. 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.

A flat roof drain is one of the most important features of a flat roof design and they need to be taken care of. Inner drains gutters or scuppers each have their own function and deciding which system is best depends on. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. Ponding water on flat roofs reduces the roof s lifespan.

The greenslope roof ponding repair kit provides a lightweight inexpensive solution to flat roof ponding. The 3 most common drain systems of a flat roof. One of the most overlooked items on a flat roof is the draining system. Fitting the roof with one of the following systems to ensure proper drainage will help keep it protected.

The result is the number of drains needed. They are ideal for climates that don t experience large quantities of rain and moisture. 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. This system works by recessing insulation in installed drains to allow for faster water drainage.

To keep damage like leaks from occurring water should not stand on a flat roof for more than 48 hours. Leaving your flat roof without a drainage system will greatly increase the risk of these issues. Take the roof s total square footage and divide by the total square footage handled by one drain. Ensure your drains are the lowest points on your flat roof and you can avoid water infiltration and subsequent flat roof repair.

Interior drains work just like the drain in your shower or sink.