Hello folks-great site. I have not posted before. Can anybody look at my drain/vent scheme and give advice? I am replacing the ancient 4" cast drain and all the terribly connected fittings on 1915 house. I'm using a rubber no-hub to connect new 4" ABS to 4" cut stack in basement. Used 2 stack clamps in attic to make sure vent stack doesn't shift.
I think my scheme of combining the kitchen and bath sink before they hit the main stack is wrong. I originally had them going into opposite sides of the double tee (4x4x2x2) with the bath/shower going into a side inlet on the 3" toilet elbow-but a lot of guys like to have the toilet separate.....thanks for any insight on this, Dave