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