How To Size Roof Leader Collection Pipe Size

4 leader size is selected.

How to size roof leader collection pipe size. Roof area is 300 x 500 ft. 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 sizing of the roof drainage system must consider all components. The result is the number of drains needed.

The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout. Roof drain system and size the scuppers denoting the required head of water above the scupper for the structural engineer. That is what is wrong. 1 calculate the roof area to be drained.

This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. Calculate drains needed. Step by step sizing of zurn drains step 1. According to the chart for 1 8 slope per 12 of pipe for 5 000 square feet of roof area with a 6 per hour of rainfall the required pipe size is 8.

In sizing roof drains and storm drainage piping one half of the area of any vertical wall that diverts rainwater to the roof shall be added to the projected roof area for inclusion in calculating the required size of vertical conductors leaders and horizontal storm drainage piping. Each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required. 300 x 500 150 000 sq. Determine the size of leader to be used.

The pipe sizing is only one component. Calculate total roof area. Roof area is 200 x 500 100 000 sq. Sizing a roof water drain.

In a roof drainage system you have many components. 1 in 25 4 mm 1 ft 305 mm 1 ft2 0 0929 m2 100 0 figure a101 1 example roof plan 4 a 101 2 solution. 4 roof drain 3 determine your building s location on the above map to determine the approximate rainfall as measured in inches per hour. To the table in figure 8 to determine the sizes of the various components of the conventional roof drainage system including roof drains vertical leaders and horizontal drainage piping.

For the purposes of this appendix the following metric conversions are applicable. Using figure 8 the 312 g p m. 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.

2 estimate the roof drain outlet size you will likely use.