What are Scupper Drains?
Scupper Drains funnel roof water directly out of a parapet wall via a downspout nozzle or the piping in between. The water flows into an external drain leader on the exterior of the building or a drain leader in the parapet wall.
These roof drains come in two variations—Drains and Sleeves. The primary distinguishing characteristic is drains sit on the roof deck against a parapet wall, whereas sleeves are installed on the parapet wall.
In addition, Parapet Scupper Sleeves only drain to the exterior wall. It is basically a pipe that goes through the parapet wall to a downspout Nozzle. The nozzle is usually designed into the sleeve.
Parapet Scupper Sleeves are often used as overflow scupper drains as their height on the wall can be adjusted as desired.
How to Measure a Scupper Drain Ring?
When measuring a scupper drain ring to find a replacement, there are three critical dimensions to measure:
- Left outside edge to right outside edge.
- Out from the parapet wall to the outside edge.
- Up from the roof deck to the upper outside edge.
The number of slots on the drain ring is also a distinguishing characteristic.
It is worth noting that it’s not uncommon for rings to be drilled on-site, and all ring dimensions change for each manufacturer when the drain’s outlet size is more than 4 inches.
Parapet scupper drains can usually be installed with the outlet either vertical or horizontal. The size charts below assume a horizontal outlet.
Parapet scupper sleeves rarely have their rings replaced. Usually, if the ring needs replacing, the entire sleeve should be replaced.
Scupper Ring Size Chart
To help identify replacement scupper drain rings, below is a list of all known drain rings and their corresponding dimensions. If you need assistance, please call us at 800-635-0384.
| Image | Manufacturer Model # | Outlet Sizes | Left to Right | Out From Parapet Wall | Up From Roof Deck | # Slots | Notes |
| Josam 24700 032460 DRP-JOS0049 Oblique Grate |
2"-4" | 11" | 4-1/2" | 6-1/2" | 4 | ||
| Josam 24700 032530 Z Code Oblique Grate |
5" & 6" | 13" | 5-1/2" | 7-1/2" | 4 | ||
| Josam 24720 032460 DRP-JOS0049 Flush Grate |
2"-4" | 11" | 4-1/2" | 6-1/2" | 4 | Ring and grate are one piece | |
| Josam 24720 032530 Z Code Flush Grate |
5" & 6" | 13" | 5-1/2" | 7-1/2" | 4 | Ring and grate are one piece | |
|
Josam 24900 032460 Z Code Oblique Grate |
2"-6" | 12" | 6" | 12" | 6 | Ring and grate are 1 piece 135° angle grate |
| Mifab R1300, R1310, R1320 & R1330 Z Code |
2-4" | 7-1/2" | 6-3/8" | 6-3/8" | 4 (per piece, 8 total) |
2-piece ring - upper and lower ring are same size | |
| Mifab R1300, R1310, R1320 & R1330 Z Code |
6" & 8" | 12-1/2" | 8-3/8" | 8-3/8" | 4 (per piece, 8 total) |
2-piece ring - upper and lower ring are same size | |
| Olympic SCUPRD Retro Scupper Drain DRP-OLY1050 |
8" | 7-1/2" | 7-1/2" | 4 | Ring and grate are 1 piece. Slots are on upper and lower ring only | ||
| Smith 1510, 1520, 1530 & 1540 DRP-STH0007 Oblique & Flush Grate |
2"-4" | 11" | 4-1/2" | 6" | 4 | ||
| Smith 1510, 1520, 1530 & 1540 DRP-STH0008 Oblique & Flush Grate |
5" & 6" | 12" | 5-1/2" | 7-3/4" | 4 | ||
|
Smith 1560 & 1570 Z Code |
2" & 3" | 10" | 3" | 3" | 8 | Ring and grate are 1 piece |
|
Smith 1580 Z Code Oblique Grate |
2"-6" | 12" | 6" | 12" | 6 | Ring and grate are 1 piece 135° angle grate |
| Wade 3270 & 3290 3270 Oblique Grate - DRPWAD1550 3290 Flush Grate - DRPWAD1551 |
2"-4" | 11-3/8" | 4-11/16" | 6-3/16" | 4 | Sold as top assemblies, ring & grate | |
| Wade 3270 & 3290 Z Code Oblique & Flush Grate |
5", 6" & 8" | 13-1/2" | 8-3/8" | 8-3/8" | 4 | ||
|
Wade 3271 Z Code Oblique Grate |
2"-6" | 12" | 6-1/2" | 12" | 6 | Ring and grate are 1 piece 135° angle grate |
| Watts RD270 & RD290 DRP-WAT0006 Oblique & Flush Grate |
2"-4" | 11" | 4-3/4" | 6-1/4" | 4 | ||
| Zurn Z187 DRP-ZRN0007 Oblique Grate |
2"-4" | 7-1/2" | 6-3/8" | 6-3/8" | 4 (per piece, 8 total) |
2-piece ring upper and lower ring are same | |
| Zurn Z187 DRP-ZRN0008 Oblique Grate |
5", 6" & 8" | 12-1/2" | 8-3/8" | 8-3/8" | 4 (per piece, 8 total) |
2-piece ring upper and lower ring are same | |
|
Zurn Z189 Z Code Flush Grate |
2"-4" | 11" | 4-3/4" | 6-1/2" | 7 (4 on upper, 3 on lower) |
2-piece ring |
