How To Size Roof Leader Collection Pipe Size

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How to size roof leader collection pipe size.

The pipe sizing is only one component. Determine the size of leader to be used. 1 calculate the roof area to be drained. 300 x 500 150 000 sq.

Calculate total roof area. Roof area is 200 x 500 100 000 sq. 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. Roof area is 300 x 500 ft.

4 roof drain 3 determine your building s location on the above map to determine the approximate rainfall as measured in inches per hour. Each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required. Calculate drains needed. Rate of rainfall would require a 5 inch roof drain and leader as well as a 6 inch horizontal drainage line if a slope of 1 4.

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. The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout. Sizing a roof water drain. The result is the number of drains needed.

4 leader size is selected. The above sizing data is offered as a guide only. For the purposes of this appendix the following metric conversions are applicable. 2 estimate the roof drain outlet size you will likely use.

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. In a roof drainage system you have many components. Step by step sizing of zurn drains step 1. 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.

This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. The sizing of the roof drainage system must consider all components. 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. Take the roof s total square footage and divide by the total square footage handled by one drain.

Roof drain system and size the scuppers denoting the required head of water above the scupper for the structural engineer.