Vertical Drain Stack Sizing

Size vertical soil and waste stacks based on total fixture units and branch intervals.

Sum of all fixtures on stack.
DFU
Number of branch intervals (typically floors).
DFU at highest branch interval.
DFU

Results

Stack Size-inches
Max Total DFU-DFU
Max per Interval-DFU
References: Based on UPC Table 703.2 and IPC Table 710.1(2) soil stack sizing