Flat roof drainage capacity of a single drain pipe or leader.
Roof drain pipe size for a 170 sq ft roof.
The roof drain typically will not remove the water as fast as you may think.
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The drains should be equally spaced and located symmetrically about the roof.
Divided by the 4 600 sq.
Equals 32 6 or 33 drains required.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
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.
2 inch hr.
Ferguson is the 1 us plumbing supply company and a top distributor of hvac parts waterworks supplies and mro products.
Roof drain connected to a 6 in.
3 inch hr.
For larger roof drains the pipe may.
Each drain can handle 4 600 sq.
The result is the number of drains needed.
50 000 4 400 11 36.
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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.
Divide total roof area by area found in step 3 to obtain the number of drains required example.
1 inch hr.
Calculate total roof area.
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Take the roof s total square footage and divide by the total square footage handled by one drain.
Rainfall rate inches per hour.
Rd rd 10 000 4 x 3 75 9 375 sq ft.
To convert to an area for use in table 1108 2 do this.
Maximum horizontal projected roof area that can be drained in square feet.
Following this logic it is possible that for roof drains 6 in.
6 inch hr.
4 leader size is selected.
Step by step sizing of zurn drains step 1.
Shop for roof drains at ferguson.
Or less in diameter the piping will be larger in diameter than the roof drain.
12 500 ft 2.
5 inch hr.
Sizing a roof water drain.
For example a 4 in.
Horizontal drain 10 000 sq ft.
Wade 3012 roof drain 9 3 4 no hub bowl w ci dome.
300 x 500 150 000 sq.
The result is a roof collapse.
5 19 6 sq in.
Pipe cross section drainage area.
4 inch hr.
Determine the size of leader to be used.
Sizing data for conventional.
An 8 inch diameter pipe on 1 4 inch per foot slope will carry 16 300 sq ft but a 6 inch will carry only 7 550 sq ft therefore use.
Each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required.
Quick view compare.
Enter table 1108 2 until you find a diameter pipe that will carry 9 375 sq ft.
