How Do You Slope A Flat Roof For Drainage

The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.

How do you slope a flat roof for drainage.

Using modern cement screed mixes a professional flat roofer can fill dips and hollows quickly and level them or slope them rather to fill the low point and re create the surface of your roof. To put it in perspective the angle of this slope would be around 30 degrees. Your building and location can help determine which drain will fit your roof needs. A rooftop garden or additional outside living space are the top reasons people choose flat roofs.

To design a sloped or flat roof drainage system we need to know the anticipated maximum rainfall rate and the flat or projected roof area. The best way to mitigate the damages of rainfall strong winds snow and falling leaves on flat rooftops is to add a slope on it. An example for a steep sloped roof is 8 12. The most critical of these issues is the flat roof drainage systems.

6 24 2014 david howard aia said. This means that the rise of the slope goes up or down 8 inches for every 12 inches. Most of the time water does run off towards a gutter or drainage system but at a very slow pace compared to your conventional sloped roofs with pitches of around 4 12.