pensfan84
New Member
I recently tore out my old cast iron stack in my house and am in the process of replacing it with ABS. I've replaced the vent portion thus far from the basement through the roof flashing with 2" ABS. I've also connected to the main cast iron pipe in the basement floor using a 4 band fernco coupling to 4" ABS. This soil stack is used to drain 2 lavatories, 2 toilets, and one tub.
Should I continue to use 4" ABS as the soil pipe before it is reduced to 2" for the vent stack, or should I use 3" ABS?
Should I continue to use 4" ABS as the soil pipe before it is reduced to 2" for the vent stack, or should I use 3" ABS?