50 000 4 400 11 36.
Roof drain pipe size for a 170 sq ft roof.
4 inch hr.
The result is the number of drains needed.
Horizontal drain 10 000 sq ft.
Sizing a roof water drain.
For larger roof drains the pipe may.
Sizing data for conventional.
Froet 100clp nh dual outlet drain low profile.
Calculate total roof area.
Rd rd 10 000 4 x 3 75 9 375 sq ft.
The drains should be equally spaced and located symmetrically about the roof.
The result is a roof collapse.
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Take the roof s total square footage and divide by the total square footage handled by one drain.
5 inch hr.
Or less in diameter the piping will be larger in diameter than the roof drain.
Pipe cross section drainage area.
3 inch hr.
Determine the size of leader to be used.
The roof drain typically will not remove the water as fast as you may think.
12 500 ft 2.
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.
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.
4 leader size is selected.
Divide total roof area by area found in step 3 to obtain the number of drains required example.
Ferguson is the 1 us plumbing supply company and a top distributor of hvac parts waterworks supplies and mro products.
5 19 6 sq in.
To convert to an area for use in table 1108 2 do this.
2 inch hr.
Equals 32 6 or 33 drains required.
Flat roof drainage capacity of a single drain pipe or leader.
Roof drain connected to a 6 in.
1 inch hr.
Quick view compare.
300 x 500 150 000 sq.
Enter table 1108 2 until you find a diameter pipe that will carry 9 375 sq ft.
For example a 4 in.
Quick view compare choose options.
Shop for roof drains at ferguson.
Roof area is 300 x 500 ft.
Maximum horizontal projected roof area that can be drained in square feet.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
Or 12 drains required.
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.
Step by step sizing of zurn drains step 1.
6 inch hr.
Each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required.
Wade 3012 roof drain 9 3 4 no hub bowl w ci dome.
Each drain can handle 4 600 sq.
Rainfall rate inches per hour.
