How do you size a scupper drain?
The only unconditional guideline for roof scupper sizing provided by the code is that “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.”
How do you calculate roof drain size?
Take the roof’s total square footage and divide by the total square footage handled by one drain. The result is the number of drains needed. For example: 50,000 / 4,400 = 11.36; or 12 drains required.
What size drain is needed for a 5000 square foot roof?
8”
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”. 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).
How do you know what size scupper to get?
To adjust this table for other than a 5-inch design rain fall rate, multiply the square footage on the table by 5 then divide by the local design rain fall rate. Example: For 4 inches of design rainfall rate, a 4-inch long scupper with a 1-inch head would accommodate 287 square feet. (230 x 5) ÷4 = 287.
Do scuppers need downspouts?
Scuppers are still compatible with downspouts, so you don’t have to worry about pooling around your foundation. Easily channel water to the most convenient drainage area with this system without constantly cleaning and maintaining your roof drains.
How do I calculate my roof drain size IPC?
In sizing roof drains and storm drainage piping, one-half of the area of any vertical wall that diverts rainwater to the roof shall be added to the projected roof area for inclusion in calculating the required size of vertical conductors, leaders and horizontal storm drainage piping.
Is a scupper a drain?
Roof scuppers are not the same as roof drains. Roof drains channel water through the deck of the roof into a piping system that carries water away, while a scupper allows water to drain through an opening in the side of the roof edge.
What is the minimum number of roof drains for any size building?
1110.4Minimum number of roof drains. Not less than two roof drains shall be installed in roof areas 10,000 square feet (929 m2) or less and not less than four roof drains shall be installed in roofs over 10,000 square feet (929 m2) in area.
How many DFU is 2 inch drain?
710.1 Maximum Fixture Unit Load
| DIAMETER OF PIPE (inches) | MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS (dfu) | |
|---|---|---|
| Total for horizontal branch | Total for stack greater than three branch intervals | |
| 11/2 | 3 | 8 |
| 2 | 6 | 24 |
| 21/2 | 12 | 42 |
What is the size of a scupper on a roof?
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. Scuppers shall not have an opening dimension of less than 4 inches.
What size overflow scuppers do I Need?
At one time an overflow scupper was required to be 3 times the area of the primary drain. I size scuppers based on the scupper being clogged (with branches, leaves, & other debris) up to the maximum ponding depth the roof is designed for (4″ for a 20 PSF roof load), then going up another 4″ or more to provide the necessary overflow area.
Are scuppers an acceptable form of roof drainage?
Scuppers shall not have an opening dimension of less than 4 inches. The flow through the primary system shall not be considered when locating and sizing scuppers. This code implies that scuppers are an acceptable form of roof drainage.
What size scuppers do I need for ponding?
I size scuppers based on the scupper being clogged (with branches, leaves, & other debris) up to the maximum ponding depth the roof is designed for (4″ for a 20 PSF roof load), then going up another 4″ or more to provide the necessary overflow area.