Roof Drainage Pipe Design

Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow.

Roof drainage pipe design. Does not include branches of the building drain refer to table 710 1 1. Stack diameters shall not be reduced to less than one half of the diameter of the largest stack size. Code tables outline pipe slopes of. Different horizontal sloping will offer different drainage capacities.

1 inch 25 4 mm. 50 000 4 400 11 36. Or 12 drains required. 1 8 1 4 and 1 2 per foot.

Buried or underground roof drainage downspout defects clogging overflowing holes corrosion leaks that cause wet basements or crawl areas proper installation of buried downspout extensions proper installation of french drains seepage pits at flat sites gutter downspout defects cause wet basements crawl areas questions answers about installing maintaining repairing buried roof. Unlike traditional roof drainage systems a siphonic system is designed to operate with the piping completely charged with water during a rainstorm. But this isn t the whole story. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage.

Stacks shall be sized based on the total accumulated connected load at each story or branch interval as the total accumulated connected load decreases stacks are permitted to be reduced in size. To design a sloped or flat roof drainage system we need to know several things. The flexible design easily bends and holds its shape and can be extended from 25 in. Take the roof s total square footage and divide by the total square footage handled by one drain.

In general roof drains are spaced equally and are located in low points of the roof or in any areas where water accumulates. 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. Note that roof drain bodies and vertical conductors are sized utilizing a different table that a horizontally sloped storm line. Each leader must be large enough to handle the volume of water to be drained the greater the leader capacity the fewer roof drains are needed.

The result is the number of drains needed. This reveals that the minimum size for the leader pipe is 5. Featuring durable vinyl construction this extension can be buried bent or connected to additional sections. Ing square roof drain catchment areas with tapered insulation panels sloped equally in four different directions with the high point at the perimeter of the roof and the low point at the roof drain.

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. Pipe sizing is listed as amount of square foot roof areas served by the drains. Crickets are additional layers of ta.