this is from a 25 year old building. 2'' wye on first floor inside lav sink cabinet that split at the wye junction. bottom joint is connected to no hub coming through 12'' slab from garage below. upper vent and waste lines for the 2nd and 3rd floor are abs.
i know from my 15 year track record there that this is the at least the 6th time i've repaired similar fittings. typically been the kitchens on the 1st and second floor.
i know when we did 3 story abs jobs, we needed an expansion joint on the second floor for waste and vents. anything more than 20' needed the expansion joints. i don't think they have them here?
pretty tight working area and 3/8'' shear-wall. other side was a stacking washer and dryer, no thanks.
the drywall cut out tool (dewalt) made an easy way to cut the drywall and the 3/8'' ply .pretty dusty but a mask was all i needed. too many copper and gas lines to use a sawzall.
reconnected with n.h. bands.