elevatorguy
New Member
Ok so if you have two toilets upstairs with 4 inch sewer out and a 4 inch vent up the roof then you wanna rough in a bathroom 8 feet below that in the "basement" and cracking into the main sewer then why do you need to vent that? I'm gonna do it right so not a hack but just thinking about it I wonder, is it if you flush the toilet at the time upstairs and downstairs. I just have been thinking too much about my project and know I need to run a new vent because my original vent 2 toilet one is 15 feet away, I just don't get the fact that the sewer line is still vented, the toilets above me have that 4 inch vent. So if I break in with a toilet 8 feet below in the main line will not that be vented?? I'm just perplexed, the only thing I can think is if you flushed at the same time it might be a issue? Hey rip me all you want plumbers I'm just wondering about this.