How Does A Flat Roof Drain Water

These are located in the central points of the roof and transport rainwater underneath the membrane to a nearby sewer.

How does a flat roof drain water.

The first thing to say about how flat roofs drain water away is that they re not actually totally flat. Pooling of water on the roof that can eventually lead to leaks or structural damage. How do flat roofs drain rainwater. Normal gutters the things we all hate to clean.

Flat roofing does not drain naturally like sloped roofs that can rely on the force of gravity to remove water. These drains are like the drain at the bottom of your shower except that the roof drain has a larger strainer to protect it from debris. A flat roof may use interior drains to collect water from the centre of the roof. Internal drains are often placed in low slope roofs when the roof span does not make a single slope practical.

If these roofing types are not fitted with a proper drainage solution they will experience poor drainage which leads to the following issues. Still the function of the two drains is the same. A low slope roof tilts slightly downhill from its center or from one side so water rolls off to parapet scuppers and down the hopper downspout. The scuppers are the openings in the outside walls specifically designed to allow water but not debris to wash off your roof.

The flat roof itself might ve actually been made too level meaning water can t run off the side. The roof slopes toward the center drain where pipes in your building channel the water into the sewage. These are common for both commercial and residential properties and is one of the more cost effective solutions for flat roof drainage. Increasing the angle of a flat roof will always increase the speed of water movement across the surface.

The angle is not significant enough to prevent water from pooling on the surface. After the slope on most flat roof designs the water heads to guttering in order to control its descent into.