When scuppers are used for secondary emergency overflow roof drainage the quantity size location and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by section 1611 1.
Ipc roof drain sizing.
Example roof plan 4 a 101 2 solution.
Each vertical drain must carry 2 500 sq ft of roof area at 3 75 inches per hour of rainfall.
The result is a roof collapse.
Scupper openings shall be not less than 4 inches 102 mm in height and have a width that is equal to or greater than the circumference of a roof drain sized for the same roof area.
The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.
Following this logic it is possible that for roof drains 6 in.
Size horizontal storm drainage piping.
Using tools from the international plumbing code ipc it s not that hard.
The flow rate used for sizing the storm drainage piping shall be based on the maximum anticipated ponding on the roof.
Take the roof s total square footage and divide by the total square footage handled by one drain.
Determine 100 year 1 hour rainfall rate used for location of building.
The roof drain typically will not remove the water as fast as you may think.
Or 12 drains required.
Ipc provides four steps to size the roof drains on a building.
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.
Select number of roof drains and calculate the roof area sloped to each drain.
To convert to an area for a 4 inch per hour rainfall to enter table 1108 1 do this.
2 500 4 x 3 75 2 344 sq ft.
Roof drain connected to a 6 in.
Or less in diameter the piping will be larger in diameter than the roof drain.
For example a 4 in.
The published roof drain flow rate based on the head of water above the roof drain shall be used to size the storm drain drainage system in accordance with section 1106.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
Sizing vertical roof drains with 2018 international plumbing code.
50 000 4 400 11 36.
Scuppers shall not have an opening dimension of less than 4 inches.
From figure 1108 4 the 100 year 60 minute precipitation is 3 75 inches per hour.
Section 1105 roof drains 1105 2 roof drain flow rate.
