I have a large crack (3 feet long and 1 inch wide at some points) in the center of my basement floor. The level is a couple inches higher at this crack, sort of like a little continental divide where one side of the crack slopes one way, and the other side of the crack slopes the opposite. How do I level this? Do I need to break it open, fill it in, or what? I have already addressed the surface water problem by building a french drain outside so these problems hopefully won't happen again. Thanks for any help.

 

A crack this large would lead me to believe that something caused it other than normal settling of a house.
It is possible that a root from a tree or something along those lines has caused the floor to push up and crack.
It would be in your interest to determine the cause of the crack and fix it before you spend money patching what may turn out to be a re-occuring problem.

My Grandfather lived in his house for 53 years, and one day during a thunder storm lightning struck a tree out back, the roots of the tree blew holes in his walls and floor slab. He had to have his slab removed and the roots removed before he could re-pour a floor.

 

Ok thanks, but there are no trees around and I have eliminated the surface water problem that probably is responsible for this problem. So Now I think I can move on.

Thanks for you reply.