How To Size Roof Leader Collection Pipe Size

Four steps to sizing roof drains.

How to size roof leader collection pipe size. 300 x 500 150 000 sq. 1 inch 25 4 mm 1 foot 304 8 mm 1 gallon per minute 3 785 l m. What size of leader will be required to drain a roof 75 feet long by 50 feet wide. Size horizontal storm drainage piping.

And 4 area handled by each drain. 1106 3 vertical leader sizing vertical leaders shall be sized based on the flow rate from horizontal gutters or the maximum flow rate through roof drains. 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. Select number of roof drains and calculate the roof area sloped to each drain.

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. Size vertical storm drainage piping. Step by step sizing of zurn drains.

Table 1106 2 storm drain pipe sizing for si. 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. 3 size of leader required. 1 rate of precipitation.

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. 2 total area of roof. Determine 100 year 1 hour rainfall rate used for location of building.