Basement Renovation - (Old) Foundation Question
I'm currently in the middle of renovating our basement washroom and laundry room. While removing the tile from the concrete floor, I noticed areas that sounded very thin (almost hallow) and there was quite a bit of moisture, in an otherwise dry basement. I was actually able to punch through the floor with my hammer. There was just loose and damp dirt/sand under the floor in the laundry room. As a result, I decided I was going to bring up the floor, put down some weeping tile to drain off any water, a proper base, then repour the floor. While digging out the floor, I found the stone foundation (the house is about 110 years old) isn't sitting on any footings, just bare soil.
My question is, is this an issue? Should I try and underpin this section? I think this is pretty normal for homes of this era and I suspect the rest of the foundation is similar.
Any help or insight would be really appreciated!