Shop for roof drains at ferguson.
Roof drain pipe size for a 170 sq ft roof.
5 19 6 sq in.
2 inch hr.
Roof area is 300 x 500 ft.
To convert to an area for use in table 1108 2 do this.
Rainfall rate inches per hour.
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.
Roof drain connected to a 6 in.
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5 inch hr.
The roof drain typically will not remove the water as fast as you may think.
6 inch hr.
50 000 4 400 11 36.
Take the roof s total square footage and divide by the total square footage handled by one drain.
Rd rd 10 000 4 x 3 75 9 375 sq ft.
Sizing a roof water drain.
Determine the size of leader to be used.
The result is the number of drains needed.
Divide total roof area by area found in step 3 to obtain the number of drains required example.
Step by step sizing of zurn drains step 1.
Wade 3012 roof drain 9 3 4 no hub bowl w ci dome.
For larger roof drains the pipe may.
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.
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.
Or less in diameter the piping will be larger in diameter than the roof drain.
Flat roof drainage capacity of a single drain pipe or leader.
300 x 500 150 000 sq.
1 inch hr.
Maximum horizontal projected roof area that can be drained in square feet.
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.
Pipe cross section drainage area.
12 500 ft 2.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
Sizing data for conventional.
Canplas frank pattern froet josam marathon mifab miro pipe support modi systems olympic plastic oddities portals plus sioux chief smith thunderbird the vault wade.
Horizontal drain 10 000 sq ft.
Equals 32 6 or 33 drains required.
Or 12 drains required.
Froet 100clp nh dual outlet drain low profile.
4 leader size is selected.
For example a 4 in.
Following this logic it is possible that for roof drains 6 in.
Each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required.
The result is a roof collapse.
Calculate total roof area.
4 inch hr.
Divided by the 4 600 sq.
Each drain can handle 4 600 sq.
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