basement shower leak flooding through slab crack

had this old ranch house where the downstairs shower started dumping water into the rec room below. turns out a hairline fracture in the concrete slab let it seep right through, like a slow motion waterfall. called in a slab jacking crew but they said epoxy injection might be better for the thin pour. now the whole area's damp and smells musty. anyone dealt with this kinda hidden slab breach? fixes without ripping up the tile?

epoxy works if it's just a crack, but check for pex lines underneath first.

slab breach? sounds like poor rebar placement from the original pour.

i'd pressure test the whole drain line before patching. had a similar gig last month, turned out the weep holes were clogged with grout. injected the crack and sealed the membrane, no more flood. client was stoked, saved em from a full demo.

nah, just drill relief holes and pump in polyurethane foam. quicker than epoxy and expands to fill voids.

disagree with foam, it can heave the slab if not done right. stick to epoxy for precision.

first off, isolate the leak source. could be a loose flange under the tile too.

epoxy injection saved my ass on a flip house. slab was thin, but held up. test for moisture migration after. if it's bad, subfloor pump out is next.