Enter table a101 2 to find a length and head that will carry 4 500 sq ft or more.
Roof leader sizing.
Table 1106 3 vertical leader sizing for si.
From table a101 2 a 12 inch wide weir with a inch head carries6 460 sq ft.
System sizing data rainfall when expressed in g p m.
2 500 4 x 7 2 9 375 sq ft 4 500 sq ft.
1 rate of precipitation.
Vertical leaders shall be sized based on the flow rate from horizontal gutters or the maximum flow rate through roof drains.
Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow.
The flow rate through vertical leaders shall not exceed that specified in table 1106 3.
But this isn t the whole story.
The availability of 7 inch top width k style gutter has been poor in the past.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
Take the roof s total square footage and divide by the total square footage handled by one drain.
2 total area of roof.
The use of 4 x 5 downspout outlets starts at a depth of gutter of 4 5 inches.
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.
The result is the number of drains needed.
Can be applied to the table in figure 8 to determine the sizes of the various components of the conventional roof drainage system including roof drains vertical leaders and horizontal drainage piping.
Or 12 drains required.
And 4 area handled by each drain.
The above sizing is reflected in the development of figure 4 downspout outlet sizing leader pipe sizing.
Using figure 8 the 312 g p m.
This corresponds to a minimum top width of 6 inches.
This wizard makes it easy to calculate the roof design area by providing various shape calculations and the calculation for vertical walls area per international plumbing code ipc.
1 inch 25 4 mm 1 gallon per minute 3 785 l m.
Use12 ichwdex5 inch high scuppers at four locations.
Smacna s new downspout and gutter sizing calculator enables the user to manually enter the design area of the roof or use the design area wizard for the calculation.
50 000 4 400 11 36.
Zurn makes it easy to size roof drains.
Rate of rainfall would.
3 size of leader required.
This reveals that the minimum size for the leader pipe is 5.
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.
