I first floor bathroom with a tub & a sink
Both seperately go up through the attic & finally through the roof.
The tub run is about 11' tub to roof, the sink run is about 17' sink to
The sink vent is run such that EVERY time I need to work in the attic,
I have to struggle around the sink vent and I often hit my head on it.
the sink & tub vents are about 6' apart in the attic
Can re-route the sink vent such that it shares the tub vent roof
The point I would connect the two vents is about 2' below the roof.
Becasue of the roof slope the "new" sink vent run would be about the
same length as the current sink vent run.
So the actual shared would only be about 2' and my head would really
appreciate the change.
Both vents are 1.5" galv steel pipe