Roof Drain Leader Pipe

Approximate leader drain pipe size.

Roof drain leader pipe.

A downspout waterspout downpipe drain spout roof drain pipe leader is a pipe for carrying rainwater from a rain gutter. Table 1106 2 storm drain pipe sizing for si. The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout. 1 inch 25 4 mm 1 foot 304 8 mm 1 gallon per minute 3 785 l m.

Featuring durable plastic construction this extension can be buried bent or connected to additional sections. Reference leader size with hourly rainfall rate to determine roof area drained by each leader chart b. Downspouts are usually vertical and usually extend down to ground level. This is where the rainwater is lead away from the building s foundation so that no rainwater is able to pool around the building.

Vertical and horizontal storm drain piping shall be sized based on the flow rate through the roof drain. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage. In general increasing leader size will decrease the number of drains required. Sizing a roof water drain the first step in sizing a roof drain is to calculate the surface area of the roof that the drains will be covering as well as the average hourly rainfall rate at the building location.

This flexible downspout extension easily bends and holds its shape and can be extended from 25 55 in. There is generally a bend of 70 degrees at the bottom. Downspouts are drainage pipes that direct rain water from the roof to the ground.