Hi Everyone. First time caller, long time listener! I've searched and haven't found a thread that answered this question: Bldg dept. is prohibiting us from connecting the lowest bathroom's local vent to the vent stack on that level, instead they need us to connect to the local vent or vent stack 6" above the flood level rim of the fixture on the level above. They just vaguely reference section 905 and I believe the closest would be IPC 905.5 (Height above fixtures) but it still seems it doesn't apply here. Where is this violation exactly in IPC, are you all familiar with this? Thanks for your time.