Recently, I sawcut and dug up the floor to get in to replace some of the old clay piping with PVC, and to cut out some of the no-longer used piping. Like any project, especially with a house 100 years old, it's a can of worms. Here's a perfect example of what 60-70 years of a water leak under a cement floor can do. Where these pictures were taken, there was a negative slope between where the old gutters went into clay and connected to the 6' main line.
The pictures show a 24" x 24' hole that opened into a 7 foot deep "cave" created by this leak. The hole under the slab is about 7' deep by 4' x about 10" wide.
The pictures show a 24" x 24' hole that opened into a 7 foot deep "cave" created by this leak. The hole under the slab is about 7' deep by 4' x about 10" wide.