Ipc Roof Drain Sizing

Determine 100 year 1 hour rainfall rate used for location of building.

Ipc roof drain sizing. For example a 4 in. Using tools from the international plumbing code ipc it s not that hard. From figure 1108 4 the 100 year 60 minute precipitation is 3 75 inches per hour. Select number of roof drains and calculate the roof area sloped to each drain.

Size horizontal storm drainage piping. 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. The flow rate used for sizing the storm drainage piping shall be based on the maximum anticipated ponding on the roof. Scuppers shall not have an opening dimension of less than 4 inches.

Example roof plan 4 a 101 2 solution. 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. 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 flow through the primary system shall not be considered when locating and sizing secondary scuppers.

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. 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. Sizing vertical roof drains with 2018 international plumbing code. Following this logic it is possible that for roof drains 6 in.

Each vertical drain must carry 2 500 sq ft of roof area at 3 75 inches per hour of rainfall. The roof drain typically will not remove the water as fast as you may think. The result is the number of drains needed. Or less in diameter the piping will be larger in diameter than the roof drain.

Section 1105 roof drains 1105 2 roof drain flow rate. 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. The result is a roof collapse. 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.

Ipc provides four steps to size the roof drains on a building. 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.