How to vent a washer drainage line?
Draining a washer tub in the basement through 25' of 2" pvc connected to the soil stack that is also connected to a floor drain. An AAV on a standpipe is placed 1.5' away from the tub's p trap. But water backs up through the floor drain opening. Solution: put in a directional valve on the floor drainage line. But now water doesn't backs up, but tub drains very slowly and may overflow with two closely spaced rinse cycles. There is a vent stack at other end of the 25' line about 5' away from where the 2' pvc is connected to the soil stack. QUESTION: should I connect to the vent stack from this point?