How Do You Slope A Flat Roof For Drainage

This means that the rise of the slope goes up or down 8 inches for every 12 inches.

How do you slope a flat roof for drainage. 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. This solution is perfect for homeowners looking for the easy option for adding slope to a flat roof property. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. Along with the benefits of a flat roof come unique challenges.

A rooftop garden or additional outside living space are the top reasons people choose flat roofs. 6 24 2014 david howard aia said. The most critical of these issues is the flat roof drainage systems. 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.

An example for a steep sloped roof is 8 12. To put it in perspective the angle of this slope would be around 30 degrees. 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.