How To Divert Water On A Flat Roof

One of the more intricate methods of controlling water flow around a building or property is by using french drains.

How to divert water on a flat roof. When it comes to pooling on your flat roof you might find that the water ponds in specific areas. Place a piece of standard metal drip edge onto a table or between a pair of sawhorses. These areas typically are near chimneys or around large vents. Turn it upside down so the lip edge faces upwards.

After any rainfall lands on a flat roof water will begin to pool. Gutters are the most commonly used and most cost effective drainage solution for flat roofs. On a performing flat roof ponding water is not a problem as it will drain or even evaporate away. Score the surface of the drip edge with 80 grit sandpaper.

Trench drains are concrete lined channels that help direct water flow while filtering out debris using grates or filters to reduce clogging. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. This is done to give the paint a better surface to adhere. The clark county extension recommends using french drains to divert roof rain water to ponds or a perforated pipe system to slow the water flow.

They catch rainwater as it rolls off the edge of the roof and divert the water into a downspout that dispenses it a safe distance from the foundation of the building. For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important. How to redirect rain off a roof. However when your flat roof has uneven areas due to sagging an insufficient slope or drainage issues the ponding water doesn t dissipate.