For the corner crack in this Wentzville, Missouri basement, we decided to inject urethane into the crack. The first picture shows how messy urethane injection may be. We did two different repairs on this particular wall crack because midway down the wall, there was a larger opening letting a maximum amount of water leak into the basement even during a light rainfall. We customize the right repair for whatever problem we find in a basement to guarantee a dry below-grade space.