How To Drain A Flat Roof

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.

How to drain a flat roof.

A flat roof drain can also fail by becoming detached from the 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. The result is the number of drains needed. Take the roof s total square footage and divide by the total square footage handled by one drain.

Interior drains work just like the drain in your shower or sink. The greenslope roof ponding repair kit provides a lightweight inexpensive solution to flat roof ponding. Flat roof drains scuppers gutters and drainage systems on flat roofs. The 3 most common drain systems of a flat roof.

Flat roofs have unique architectural characteristics that make them desirable in many situations. Inner drains gutters or scuppers each have their own function and deciding which system is best depends on. Ponding water on flat roofs reduces the roof s lifespan. More attention should be given to the location of a drainage system to avoid future problems.

Leaving your flat roof without a drainage system will greatly increase the risk of these issues. Ensure your drains are the lowest points on your flat roof and you can avoid water infiltration and subsequent flat roof repair. The angle is not significant enough to prevent water from pooling on the surface. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.

For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important. The above sizing data is offered as a guide only. 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 is one of the most important features of a flat roof design and they need to be taken care of.

Calculate drains needed. They are ideal for climates that don t experience large quantities of rain and moisture. One of the most overlooked items on a flat roof is the draining system. 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.

To keep damage like leaks from occurring water should not stand on a flat roof for more than 48 hours.