My front porch is concrete and is above a portion of my garage, laundry room, and a basement bathroom. The house is in Zone 6b: -5 to 0 F. The rooms are not finished and I am not sure of the ceilings construction (see photos). I initially thought the same concrete slab makes the floor of the porch and ceiling of the rooms below, but there is some lighting in these rooms. Possibly there's just conduit embedded in the concrete and this is still true. If it helps, my house was built in 1940 and has a block foundation which this concrete slab sits on.
My concern is I have two cracks in my ceiling that run the width of this slab. Both of these cracks leak anytime there is moisture above, despite the porch looking to be painted relatively recently (I just purchased the home).
I'm concerned about this because the bathroom crack has obvious signs of damage to the concrete/plaster. It give when I push on it around the crack and I'm sure I could easily chip it away. Also, I would like to finish the bathroom, maybe even the laundry room, and would like to hang drywall or something without concerns of moisture getting through. Finally, it's worth noting, that this home has a home warranty and if I can anticipate any costly repairs that might be covered, I'd like to move now.
So my question is, is this a big concern, ad either way, how can I fix this? Thanks.