Scoring concrete floor
I need to cut a 24" X 24" hole in my basement floor to dig out a sump pit. Before I rent the jack hammer to break up the floor, I wanted to score the concrete so I don't spider web the entire floor. When scoring the floor, how deep should I go? I'm just using a circular saw and a masonry disk so I'm hoping just a small score with do the trick.
Anyone have any insight?