internal french drain can be installed in a no footing basement?
We are thinking about put a french drain down to our full basement, about 7' below the ground. The house is a 1950's ranch house. The basement is poured concrete. There is no cracks on all walls. We are in Boston, MA.
There is no footing in this house. I found this from a plumbing project.
Because there is no footing, I am worry about the internal french drain project will weaken the foundation. During the installation, they will cut the concrete floor and dig a trench aside the wall then put back some gravels. those gravels and pipes will not as strong or tight as the original earth. Am I right? we do got lots of water from the wall-floor joints last spring during the VERY heavy rain because the water table was higher than usual.