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The overflow drains must not be connected to the roof drains.
4 Effective Ways to Drain Water from a Flat Roof Inner Drains. True to their name, inner drains are installed within the roof or in the parapet walla small wall or railing around the edge of the roof. Scuppers. Scuppers are a simple draining method for flat roofs. Gutters. Siphonic Roof Drain.
Take the roofs total square footage and divide by the total square footage handled by one drain. The result is the number of drains needed. For example: 50,000 / 4,400 = 11.36; or 12 drains required.
ⓘ The standard sizes for top manufacturers are normally 2, 3, 4, 5, 6, and 8 inches. How do you know which size you need? It will depend on the area that one drain can handle and the hourly rainfall that you receive in your area.
The secondary roof drains shall be located not less than 2 inches (51 mm) above the roof surface. The maximum height of the roof drains shall be a height to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.
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Zurn makes it easy to size roof drains. The four things you will need to know are: 1) rate of precipitation; 2) total area of roof; 3) size of leader required; and 4) area handled by each drain. When sizing roof drains, the limiting factor for the amount of water each drain will carry away is the size of leader.
Step by Step Instructions Step 1: Calculate total roof area. Calculate the total roof area by multiplying its length by width. Step 2: Determine leader size. Determine leader or pipe size. Step 3: Find rainfall rate. Step 4: Find the area handled by one drain. Step 5: Calculate drains needed.
Select a reference of a roof drain size with hourly rainfall together with the roof area square footage you have estimated and then determine from the chart below how many roof drains you require. Example: Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3,070 sq. ft. of roof area.

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