Roof Drain Slope

The roof pitch or slope factors for roof pitch are used to multiply or increase the rainfall rate if we are draining a sloped roof the roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g.

Roof drain slope.

Tips on calculating drain pipe slopes. This may eventually cause leaks and other damage. Use the longest level possible for your application for the best accuracy. The angle is not significant enough to prevent water from pooling on the surface.

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. 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. For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important. Since the pitch of the roof is lower it can act as a catch all for tree limbs and other debris.

Due to the gradual low slope of this type of roof rainfall will not drain as effectively. Care must be given so that debris does not collect and thus cause 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.