Roof Leader Line

Step by step sizing of zurn drains step 1.

Roof leader line.

A downspout waterspout downpipe drain spout roof drain pipe leader is a pipe for carrying rainwater from a rain gutter. If outside roof leader lines connect to your combined house sewer outside your house the combining point each leader line drain must be trapped. Take the roof s total square footage and divide by the total square footage handled by one drain. The waste accumulated around the strainer would lead to block in the drainage of water.

Roof area is 300 x 500 ft. 300 x 500 150 000 sq. 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. 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.

Calculate drains needed. This reveals that the minimum size for the leader pipe is 5. The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout. Calculate total roof area.

Sizing a roof water drain. But this isn t the whole story. The water is directed away from the building s foundation to protect the foundations from water damage. 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 above sizing data is offered as a guide only. Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow. The top portion of the drain has a strainer or a cover which prevents leaves and other debris from entering the drain to some extent. 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.

Downspouts are usually vertical and usually extend down to ground level. This drain is found on the roof and it connects the roof to an outlet pipe. In addition to their ornamental appeal he points out that leader heads. 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.

It is connected to the mainline with a swivel or line to line connection such as the double uni knot. A leader line is the last 3 20 feet of line that is connected to a hook or lure. Otherwise sewer gas will escape between the roof leader line and where it enters the underground drain.