Cracks In Basement Floor Getting Worse. This sort of damage suggests soil expansion beneath the basement floor: When plumbing leaks occur, either from water lines or sewer lines and the moisture migrates around or under a foundation, then cracking may occur.
Then fresh concrete can be placed in the same area and sloped from the high side to the low side, thus getting rid of the abrupt change in level. This sort of damage suggests soil expansion beneath the basement floor: However, some cracks in the basement floor can let in water, moisture, and dangerous soil gasses (including radon).
Actually, concrete cracks are very common, some are even inevitable.
The easiest way to tell if there is water coming up through the basement floor will be a puddle of water somewhere on the floor. Some foundations that are moving or sinking have one large crack, while others have many small cracks. It can be caused by the earth pushing against the basement wall and an inadequate connection (i.e. American concrete institute touches on the issue of cracking concrete in their american concrete institute manual, aci 302.