Roof Leader Line

The result is the number of drains needed.

Roof leader line.

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. Roof area is 300 x 500 ft. A leader line is the last 3 20 feet of line that is connected to a hook or lure. If outside roof leader lines connect to your combined house sewer outside your house the combining point each leader line drain must be trapped.

Calculate total roof area. It is connected to the mainline with a swivel or line to line connection such as the double uni knot. This reveals that the minimum size for the leader pipe is 5. Calculate drains needed.

Take the roof s total square footage and divide by the total square footage handled by one 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. Otherwise sewer gas will escape between the roof leader line and where it enters the underground drain. Downspouts are usually vertical and usually extend down to ground level.

The waste accumulated around the strainer would lead to block in the drainage of water. A trap for a leader line or area drain can be present either inside of outside the building. The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout. But this isn t the whole story.

Step by step sizing of zurn drains step 1. 300 x 500 150 000 sq. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. A downspout waterspout downpipe drain spout roof drain pipe leader is a pipe for carrying rainwater from a rain gutter.

This drain is found on the roof and it connects the roof to an outlet pipe. Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow. Sizing a roof water drain. The water is directed away from the building s foundation to protect the foundations from water damage.

The above sizing data is offered as a guide only. 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. In addition to their ornamental appeal he points out that leader heads.