The maximum number of drainage fixture units allowed on a horizontal branch or vertical soil or waste stack of a given size shall be in accordance with Table C304.3. Stacks shall be sized based on the total accumulated connected load at each story or branch interval.
For SI units: 1 inch = 25 mm.
|MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS|
|ONE STACK OF THREE
OR FEWER BRANCH
|STACKS WITH MORE THAN THREE BRANCH INTERVALS|
|TOTAL FOR STACK||TOTAL AT ONE BRANCH
- 1 Does not include branches of the building drain.
- 2 A maximum of two water closets or bathroom groups within each branch interval or more than six water closets or bathroom groups on the stack.
Horizontal stack offsets shall be sized in accordance with Table C304.2 as required for building drains.