Roof Drain Slope

Use the longest level possible for your application for the best accuracy.

Roof drain slope.

Due to the gradual low slope of this type of roof rainfall will not drain as effectively. For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important. The angle is not significant enough to prevent water from pooling on the surface. The best type for the application depends on several factors such as the size and slope of the roof the desired appearance and how much regular maintenance the drain system might need.

Care must be given so that debris does not collect and thus cause damage. This may eventually cause leaks and other damage. Roof drains for flat or low slope roofs come in a few standard types. Same logic with 1 8 slope 1 16 slope etc.

To size the vertical roof drain for the same parameters 5 000 square feet of room area and 6 per hour of rain consult table 1106 2 figure 3. Tips on calculating drain pipe slopes. According to the chart for 1 8 slope per 12 of pipe for 5 000 square feet of roof area with a 6 per hour of rainfall the required pipe size is 8. When the bubble on a level is about 1 4 of the way past the line it is about a 1 4 slope.