Our house is over 100 years old with an old sandstone foundation and a concrete floor that was added decades after the house was built. The basement ceiling clearance is low, like 5'10", but I don't think the floor was built up much. I have always had reason to believe the floor was a thin layer of concrete.
There are a bunch of drains on the south side of the basement. In the room under the porch (south), there are two floor drains on each side of the room next to the main house foundation. One was used for a shower on the east corner. The other is open floor drain on the west side where there is an entrance between the under-the-porch room and the main basement. Inside the main basement, directly on the other side south wall from where the shower drain is located, there is a toilet drain in the main house basement. The toilet sits along the east wall about 2' from the south wall. Along the south wall, about 3' from the east wall, there is a drain for where there used to be a sink. So basically, the sink drain is about 4' from the toilet drain in the main basement, and about 3' from the shower drain in the under-the-porch room on the other side of the main house foundation wall.
All drains work fine but the sink drain, which we didn't know until we tried to install a utility sink yesterday. We had tested it first via dumping a few gallons of water down it, and we thought it worked. When we installed the utility sink and ran it for the shortest time, water instantly seeped through the concrete floor.
I'm trying to figure out the easiest way to connect this sink drain to one of the working drains. I don't know for sure, but my guess is it currently runs to the shower drain on the other side of the wall. The sandstone foundation is 2-1/2' thick. It seems it would be very difficult to replace the piping under the wall. Is it possible to connect a sink drain to a toilet drain? Or is that a really bad idea? It just seems easier to tear up the concrete floor in the one room than try to dig under the foundation. Or would it be better if we installed a long pipe to the open drain that's on the southwest corner of the basement? That one is about 20' away from the sink drain.
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