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917.2 Stack Size
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Drainage stacks shall be sized in accordance with Table 917.2. Stacks shall be uniformly sized based on the total connected drainage fixture unit load. The stack vent shall be the same size as the drainage stack. A 3-inch (76 mm) stack shall serve not more than two water closets.
SINGLE STACK SIZE
| STACK SIZE (inches) | MAXIMUM CONNECTED DRAINAGE FIXTURE UNITS | ||
| Stacks less than 75 feet in height | Stacks 75 feet to less than 160 feet in height | Stacks 160 feet and greater in height | |
| 3 | 24 | NP | NP |
| 4 | 225 | 24 | NP |
| 5 | 480 | 225 | 24 |
| 6 | 1,015 | 480 | 225 |
| 8 | 2,320 | 1,015 | 480 |
| 10 | 4,500 | 2,320 | 1,015 |
| 12 | 8,100 | 4,500 | 2,320 |
| 15 | 13,600 | 8,100 | 4,500 |
NP = Not Permitted
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
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