Bowing Basement Walls: Many places where basements are utilized, both residentially and commercially, are areas that see a lot of wet weather, or are around large water sources that flood. When water builds up in the soil around a basement foundation it causes hydrostatic pressure to build up around the the walls. The walls will bow in or lean in under that pressure. If left untreated the walls will eventually crack. Water will find it's way in through cracks and cause your basement to be wet, humid, and musty.
Basement Wall and Floor Cracks: The problem above can lead to this problem but other things can cause basement foundation wall cracks and floor cracks. When the soil around the foundation is not compacted properly or is of poor quality, then the weight of the foundation or structure above it can push down, causing settlement, sinking, and shifting. Cracks are a common issue, and not all cracks are a sign of something serious. However they shouldn't be taken lightly either. Water can make it's way in through cracks causing humidity, flooding, or even mold. The bigger problem is that some cracks are a sign of foundation problems. Cracks should be checked by a foundation specialists to confirm if they are a sign of foundation problems right away before they become a larger issue.
Sinking Basement Floors: When the ground beneath some basement foundations can actually be loose, non-compacted soil. In the worst cases, the floor of the foundation can actually sink causing damage all the way up the structure. Doors and windows can stick, not open and close properly. You can find cracks in tiles, walls, drywall, mortar and brick, garage columns, and wall joints. A sinking or settling foundation is a serious foundation problem that should be inspected and treated immediately.
Mold and mildew: Water in the basement can be a serious health risk. As much as 50% of the air you breathe in your home comes from your basement. If mold and mildew are present then it is likely in the air you breathe. Basement waterproofing solutions including sump pumps, interior and exterior drainage, surface drainage, and more can prevent water damage and future foundation issues as well.