Running horizontal soil pipe.

[Leemckie91]

Ok, i have a 3 WC's, 2 urinals, 4 wash basins to install in a restaurant the soil pipe runs horizontal in a void. Just wondering what is the maximum length it can be? the length it needs too be is around 8 meters. If I'm correct the maximum is 6 meters? Also the stack what is in now is vented at the end but it needs to be extended another 2 or 3 meters from that.

Just wondering what the best cause of action would be too take.

 

[joni os]

Building Regs: H-1 Table 2 will confirm no problem provided minimum falls, but in a commercial setting the addition of easy access rodding at end of run should be considered.
This could be achieved with stack brought above spill level on radius bend capped with screw blank or removable AAV.

 

[stevetheplumber]

run 2 inch anti back to the vented stack from the additional items on your extension