Hello everyone
I have a configuration where the toilet drain runs in the bay between two floor joists in the “forward” direction - that is, the direction you’d be facing when sitting on the toilet - out to the main sewer. This means that a vent rising vertically from the drain within 6’ of the toilet trap (I’m in UPC territory) would poke up through the bathroom floor - not good. And, because of the prohibition on horizontal vents below FLR, the vent can't jog sideways through a floor joist to a convenient side wall. The joists are only 2x10 so the angle isn’t enough to qualify as vertical.
The wall behind the toilet is the perfect place for the vent to rise, but how to get the vent over there? The FLR/horizontal rule gets in the way just as it did for getting to a side wall.
It seems to me that this situation would be pretty common so I’d assume there’s a solution.
So I’ve got two questions. First, is there any approved way to attach the vent to the back side of a closet bend? Conceptually, like using a quarter bend, with heel for the vent (I know UPC doesn’t permit that). But how about a combo wye and 1/8 bend, with the vent coming out the back? Second, does the FLR/horizontal vent restriction still apply if the vent is washed? I could potentially drain a lav through that pipe.
Thanks!
I have a configuration where the toilet drain runs in the bay between two floor joists in the “forward” direction - that is, the direction you’d be facing when sitting on the toilet - out to the main sewer. This means that a vent rising vertically from the drain within 6’ of the toilet trap (I’m in UPC territory) would poke up through the bathroom floor - not good. And, because of the prohibition on horizontal vents below FLR, the vent can't jog sideways through a floor joist to a convenient side wall. The joists are only 2x10 so the angle isn’t enough to qualify as vertical.
The wall behind the toilet is the perfect place for the vent to rise, but how to get the vent over there? The FLR/horizontal rule gets in the way just as it did for getting to a side wall.
It seems to me that this situation would be pretty common so I’d assume there’s a solution.
So I’ve got two questions. First, is there any approved way to attach the vent to the back side of a closet bend? Conceptually, like using a quarter bend, with heel for the vent (I know UPC doesn’t permit that). But how about a combo wye and 1/8 bend, with the vent coming out the back? Second, does the FLR/horizontal vent restriction still apply if the vent is washed? I could potentially drain a lav through that pipe.
Thanks!