I am purchasing a house in Chicago area. The house is about 6 years old. It has a full basement and a crawl space. During the home inspcetion, I noticed there is a vertical crack in the interior wall of the crawl space. It was fairly thin and not very long (I can barely stick a piece of paper in it). The inspector said it is a minor problem and quiet normal. A month later, I had the final walk-through. I found the crack became longer and wider. The widest part is about
0.15", and the crack goes down to the ground. Why does the crack grow so fast? Does it mean there is something else wrong with the house? If yes, how serious it can be?Any advice/comment is welcome! Thanks in advance!