Roof Leader Line

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

Roof leader line.

Sizing a roof water drain. Take the roof s total square footage and divide by the total square footage handled by one drain. 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. The above sizing data is offered as a guide only.

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. Calculate total roof area. 300 x 500 150 000 sq. A leader line is the last 3 20 feet of line that is connected to a hook or lure.

This reveals that the minimum size for the leader pipe is 5. If outside roof leader lines connect to your combined house sewer outside your house the combining point each leader line drain must be trapped. In addition to their ornamental appeal he points out that leader heads. But this isn t the whole story.

A downspout waterspout downpipe drain spout roof drain pipe leader is a pipe for carrying rainwater from a rain gutter. Step by step sizing of zurn drains step 1. This drain is found on the roof and it connects the roof to an outlet pipe. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.

When sizing roof drains the limiting factor for the amount of water each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required. The leader line can be a variety of materials including a fluorocarbon line nylon monofilament line multi strand cable single strand wire braided line or even. 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. The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.

The waste accumulated around the strainer would lead to block in the drainage of water. Otherwise sewer gas will escape between the roof leader line and where it enters the underground drain. A trap for a leader line or area drain can be present either inside of outside the building. Roof area is 300 x 500 ft.

Calculate drains needed. The water is directed away from the building s foundation to protect the foundations from water damage. The result is the number of drains needed.